| Loans and Allowance for Loan Losses (Details 3) (USD $)In Thousands, unless otherwise specified
 | 9 Months Ended | 12 Months Ended | 
      
        | Sep. 30, 2012 | Dec. 31, 2011 | 
      
        | Impaired loans individually evaluated for impairment |  |  | 
      
        | Loans with a specific allowance, Related Allowance | $ 11,438 | $ 10,298 | 
      
        | Loans with a specific allowance, Interest Income Recognized | 4,891 | 10,053 | 
      
        | Recorded Investment | 161,196 | 242,833 | 
      
        | Unpaid Principal Balance | 163,553 | 245,391 | 
      
        | Year to Date Average Investment | 169,315 | 251,317 | 
      
        | Loans without a specific allowance [Member] |  |  | 
      
        | Impaired loans individually evaluated for impairment |  |  | 
      
        | Loans without a specific allowance, Recorded Investment | 113,203 | 169,112 | 
      
        | Loans without a specific allowance, Unpaid Principle Balance | 114,851 | 170,395 | 
      
        | Loans without a specific allowance, Related Allowance |  |  | 
      
        | Loans without a specific allowance, YTD Average Investment | 119,508 | 171,836 | 
      
        | Loans without a specific allowance, Interest Income Recognized | 3,812 | 7,397 | 
      
        | Loans with a specific allowance [Member] |  |  | 
      
        | Impaired loans individually evaluated for impairment |  |  | 
      
        | Loans with a specific allowance, Recorded Investment | 47,993 | 73,721 | 
      
        | Loans with a specific allowance, Unpaid Principle Balance | 48,702 | 74,996 | 
      
        | Loans with a specific allowance, Related Allowance | 11,438 | 10,298 | 
      
        | Loans with a specific allowance, YTD Average Investment | 49,807 | 79,481 | 
      
        | Loans with a specific allowance, Interest Income Recognized | 1,079 | 2,656 | 
      
        | Commercial Construction [Member] |  |  | 
      
        | Impaired loans individually evaluated for impairment |  |  | 
      
        | Loans without a specific allowance, Recorded Investment | 30,864 | 40,475 | 
      
        | Loans without a specific allowance, Unpaid Principle Balance | 31,347 | 40,524 | 
      
        | Loans without a specific allowance, Related Allowance |  |  | 
      
        | Loans without a specific allowance, YTD Average Investment | 31,913 | 37,835 | 
      
        | Loans without a specific allowance, Interest Income Recognized | 1,073 | 1,690 | 
      
        | Loans with a specific allowance, Recorded Investment | 4,290 | 12,927 | 
      
        | Loans with a specific allowance, Unpaid Principle Balance | 4,338 | 13,297 | 
      
        | Loans with a specific allowance, Related Allowance | 1,368 | 583 | 
      
        | Loans with a specific allowance, YTD Average Investment | 4,360 | 13,811 | 
      
        | Loans with a specific allowance, Interest Income Recognized | 20 | 343 | 
      
        | Commercial Real Estate - Owner Occupied [Member] |  |  | 
      
        | Impaired loans individually evaluated for impairment |  |  | 
      
        | Loans without a specific allowance, Recorded Investment | 10,774 | 20,487 | 
      
        | Loans without a specific allowance, Unpaid Principle Balance | 11,246 | 21,010 | 
      
        | Loans without a specific allowance, Related Allowance |  |  | 
      
        | Loans without a specific allowance, YTD Average Investment | 11,517 | 23,364 | 
      
        | Loans without a specific allowance, Interest Income Recognized | 423 | 1,183 | 
      
        | Loans with a specific allowance, Recorded Investment | 2,718 | 8,679 | 
      
        | Loans with a specific allowance, Unpaid Principle Balance | 2,853 | 8,788 | 
      
        | Loans with a specific allowance, Related Allowance | 665 | 1,961 | 
      
        | Loans with a specific allowance, YTD Average Investment | 2,888 | 8,681 | 
      
        | Loans with a specific allowance, Interest Income Recognized | 22 | 267 | 
      
        | Commercial Real Estate - Non-Owner Occupied [Member] |  |  | 
      
        | Impaired loans individually evaluated for impairment |  |  | 
      
        | Loans without a specific allowance, Recorded Investment | 21,230 | 37,799 | 
      
        | Loans without a specific allowance, Unpaid Principle Balance | 21,305 | 37,855 | 
      
        | Loans without a specific allowance, Related Allowance |  |  | 
      
        | Loans without a specific allowance, YTD Average Investment | 22,644 | 38,084 | 
      
        | Loans without a specific allowance, Interest Income Recognized | 867 | 2,002 | 
      
        | Loans with a specific allowance, Recorded Investment | 13,546 | 8,858 | 
      
        | Loans with a specific allowance, Unpaid Principle Balance | 13,580 | 8,879 | 
      
        | Loans with a specific allowance, Related Allowance | 426 | 1,069 | 
      
        | Loans with a specific allowance, YTD Average Investment | 13,777 | 9,010 | 
      
        | Loans with a specific allowance, Interest Income Recognized | 568 | 322 | 
      
        | Raw Land and Lots [Member] |  |  | 
      
        | Impaired loans individually evaluated for impairment |  |  | 
      
        | Loans without a specific allowance, Recorded Investment | 35,067 | 46,791 | 
      
        | Loans without a specific allowance, Unpaid Principle Balance | 35,141 | 46,890 | 
      
        | Loans without a specific allowance, Related Allowance |  |  | 
      
        | Loans without a specific allowance, YTD Average Investment | 36,376 | 47,808 | 
      
        | Loans without a specific allowance, Interest Income Recognized | 941 | 1,306 | 
      
        | Loans with a specific allowance, Recorded Investment | 12,472 | 22,188 | 
      
        | Loans with a specific allowance, Unpaid Principle Balance | 12,669 | 22,429 | 
      
        | Loans with a specific allowance, Related Allowance | 3,052 | 991 | 
      
        | Loans with a specific allowance, YTD Average Investment | 13,168 | 24,553 | 
      
        | Loans with a specific allowance, Interest Income Recognized | 118 | 973 | 
      
        | Single Family Investment Real Estate [Member] |  |  | 
      
        | Impaired loans individually evaluated for impairment |  |  | 
      
        | Loans without a specific allowance, Recorded Investment | 5,860 | 11,285 | 
      
        | Loans without a specific allowance, Unpaid Principle Balance | 6,180 | 11,349 | 
      
        | Loans without a specific allowance, Related Allowance |  |  | 
      
        | Loans without a specific allowance, YTD Average Investment | 6,440 | 11,684 | 
      
        | Loans without a specific allowance, Interest Income Recognized | 216 | 637 | 
      
        | Loans with a specific allowance, Recorded Investment | 2,503 | 9,020 | 
      
        | Loans with a specific allowance, Unpaid Principle Balance | 2,573 | 9,312 | 
      
        | Loans with a specific allowance, Related Allowance | 962 | 1,140 | 
      
        | Loans with a specific allowance, YTD Average Investment | 2,736 | 9,571 | 
      
        | Loans with a specific allowance, Interest Income Recognized | 44 | 321 | 
      
        | Commercial and Industrial [Member] |  |  | 
      
        | Impaired loans individually evaluated for impairment |  |  | 
      
        | Loans without a specific allowance, Recorded Investment | 3,361 | 9,467 | 
      
        | Loans without a specific allowance, Unpaid Principle Balance | 3,394 | 9,959 | 
      
        | Loans without a specific allowance, Related Allowance |  |  | 
      
        | Loans without a specific allowance, YTD Average Investment | 3,837 | 10,216 | 
      
        | Loans without a specific allowance, Interest Income Recognized | 135 | 423 | 
      
        | Loans with a specific allowance, Recorded Investment | 9,929 | 8,980 | 
      
        | Loans with a specific allowance, Unpaid Principle Balance | 10,069 | 9,133 | 
      
        | Loans with a specific allowance, Related Allowance | 3,581 | 3,320 | 
      
        | Loans with a specific allowance, YTD Average Investment | 10,059 | 10,448 | 
      
        | Loans with a specific allowance, Interest Income Recognized | 304 | 369 | 
      
        | Other Commercial [Member] |  |  | 
      
        | Impaired loans individually evaluated for impairment |  |  | 
      
        | Loans without a specific allowance, Recorded Investment | 906 | 1,257 | 
      
        | Loans without a specific allowance, Unpaid Principle Balance | 906 | 1,257 | 
      
        | Loans without a specific allowance, Related Allowance |  |  | 
      
        | Loans without a specific allowance, YTD Average Investment | 1,009 | 1,269 | 
      
        | Loans without a specific allowance, Interest Income Recognized | 46 | 75 | 
      
        | Loans with a specific allowance, Recorded Investment | 134 | 150 | 
      
        | Loans with a specific allowance, Unpaid Principle Balance | 134 | 150 | 
      
        | Loans with a specific allowance, Related Allowance | 108 | 3 | 
      
        | Loans with a specific allowance, YTD Average Investment | 134 | 153 | 
      
        | Loans with a specific allowance, Interest Income Recognized |  | 10 | 
      
        | Mortgage [Member] |  |  | 
      
        | Impaired loans individually evaluated for impairment |  |  | 
      
        | Loans without a specific allowance, Recorded Investment | 2,592 | 1,202 | 
      
        | Loans without a specific allowance, Unpaid Principle Balance | 2,645 | 1,202 | 
      
        | Loans without a specific allowance, Related Allowance |  |  | 
      
        | Loans without a specific allowance, YTD Average Investment | 2,983 | 1,225 | 
      
        | Loans without a specific allowance, Interest Income Recognized | 80 | 70 | 
      
        | Loans with a specific allowance, Recorded Investment |  | 535 | 
      
        | Loans with a specific allowance, Unpaid Principle Balance |  | 535 | 
      
        | Loans with a specific allowance, Related Allowance |  | 11 | 
      
        | Loans with a specific allowance, YTD Average Investment |  | 536 | 
      
        | Loans with a specific allowance, Interest Income Recognized |  | 32 | 
      
        | Consumer Construction [Member] |  |  | 
      
        | Impaired loans individually evaluated for impairment |  |  | 
      
        | Loans with a specific allowance, Recorded Investment | 210 | 207 | 
      
        | Loans with a specific allowance, Unpaid Principle Balance | 236 | 226 | 
      
        | Loans with a specific allowance, Related Allowance | 76 | 86 | 
      
        | Loans with a specific allowance, YTD Average Investment | 226 | 228 | 
      
        | Loans with a specific allowance, Interest Income Recognized |  |  | 
      
        | Indirect Marine [Member] |  |  | 
      
        | Impaired loans individually evaluated for impairment |  |  | 
      
        | Loans without a specific allowance, Recorded Investment | 876 |  | 
      
        | Loans without a specific allowance, Unpaid Principle Balance | 876 |  | 
      
        | Loans without a specific allowance, Related Allowance | 404 |  | 
      
        | Loans without a specific allowance, YTD Average Investment | 879 |  | 
      
        | Loans without a specific allowance, Interest Income Recognized | 3 |  | 
      
        | Loans with a specific allowance, Recorded Investment |  | 544 | 
      
        | Loans with a specific allowance, Unpaid Principle Balance |  | 547 | 
      
        | Loans with a specific allowance, Related Allowance |  | 263 | 
      
        | Loans with a specific allowance, YTD Average Investment |  | 548 | 
      
        | Loans with a specific allowance, Interest Income Recognized |  | 9 | 
      
        | Indirect Auto [Member] |  |  | 
      
        | Impaired loans individually evaluated for impairment |  |  | 
      
        | Loans without a specific allowance, Recorded Investment | 6 |  | 
      
        | Loans without a specific allowance, Unpaid Principle Balance | 6 |  | 
      
        | Loans without a specific allowance, Related Allowance |  |  | 
      
        | Loans without a specific allowance, YTD Average Investment | 9 |  | 
      
        | Loans without a specific allowance, Interest Income Recognized |  |  | 
      
        | Loans with a specific allowance, Recorded Investment |  | 71 | 
      
        | Loans with a specific allowance, Unpaid Principle Balance |  | 71 | 
      
        | Loans with a specific allowance, Related Allowance |  |  | 
      
        | Loans with a specific allowance, YTD Average Investment |  | 93 | 
      
        | Loans with a specific allowance, Interest Income Recognized |  | 5 | 
      
        | HELOCs [Member] |  |  | 
      
        | Impaired loans individually evaluated for impairment |  |  | 
      
        | Loans without a specific allowance, Recorded Investment | 1,672 | 349 | 
      
        | Loans without a specific allowance, Unpaid Principle Balance | 1,771 | 349 | 
      
        | Loans without a specific allowance, Related Allowance |  |  | 
      
        | Loans without a specific allowance, YTD Average Investment | 1,843 | 350 | 
      
        | Loans without a specific allowance, Interest Income Recognized | 10 | 11 | 
      
        | Loans with a specific allowance, Recorded Investment | 752 | 785 | 
      
        | Loans with a specific allowance, Unpaid Principle Balance | 811 | 825 | 
      
        | Loans with a specific allowance, Related Allowance | 550 | 587 | 
      
        | Loans with a specific allowance, YTD Average Investment | 1,017 | 1,034 | 
      
        | Loans with a specific allowance, Interest Income Recognized |  |  | 
      
        | Other Consumer [Member] |  |  | 
      
        | Impaired loans individually evaluated for impairment |  |  | 
      
        | Loans without a specific allowance, Recorded Investment | 871 |  | 
      
        | Loans without a specific allowance, Unpaid Principle Balance | 910 |  | 
      
        | Loans without a specific allowance, Related Allowance |  |  | 
      
        | Loans without a specific allowance, YTD Average Investment | 937 | 1 | 
      
        | Loans without a specific allowance, Interest Income Recognized | 21 |  | 
      
        | Loans with a specific allowance, Recorded Investment | 563 | 777 | 
      
        | Loans with a specific allowance, Unpaid Principle Balance | 563 | 804 | 
      
        | Loans with a specific allowance, Related Allowance | 246 | 284 | 
      
        | Loans with a specific allowance, YTD Average Investment | 563 | 815 | 
      
        | Loans with a specific allowance, Interest Income Recognized |  | $ 5 |