Quarterly report pursuant to Section 13 or 15(d)

Loans and Allowance for Loan Losses (Details 6)

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Loans and Allowance for Loan Losses (Details 6) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended 12 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2011
Allowance for loan losses:      
Balance, beginning of the year $ 39,470 $ 38,406  
Recoveries credited to allowance 1,371 2,130  
Loans charged off (9,847) (17,866)  
Provision charged to operations 8,900 16,800  
Balance, end of year 39,894 39,470  
Ending balance: individually evaluated for impairment 11,309 10,213  
Ending balance: collectively evaluated for impairment 28,456 29,172  
Ending balance: loans acquired with deteriorated credit quality 129 85  
Total 39,894 39,470  
Loans:      
Ending balance 2,908,510 2,818,583 2,818,342
Ending balance: individually evaluated for impairment 154,759 232,936  
Ending balance: collectively evaluated for impairment 2,747,314 2,575,750  
Ending balance: loans acquired with deteriorated credit quality 6,437 9,897  
Total Loans 2,908,510 2,818,583 2,818,342
Commercial [Member]
      
Allowance for loan losses:      
Balance, beginning of the year 27,891 28,255  
Recoveries credited to allowance 490 924  
Loans charged off (5,956) (10,891)  
Provision charged to operations 7,301 9,603  
Balance, end of year 29,726 27,891  
Ending balance: individually evaluated for impairment 10,033 8,982  
Ending balance: collectively evaluated for impairment 19,564 18,824  
Ending balance: loans acquired with deteriorated credit quality 129 85  
Total 29,726 27,891  
Loans:      
Ending balance 2,054,540 1,956,241  
Ending balance: individually evaluated for impairment 148,223 229,535  
Ending balance: collectively evaluated for impairment 1,900,886 1,717,878  
Ending balance: loans acquired with deteriorated credit quality 5,431 8,828  
Total Loans 2,054,540 1,956,241  
Consumer [Member]
      
Allowance for loan losses:      
Balance, beginning of the year 11,498 10,189  
Recoveries credited to allowance 881 1,206  
Loans charged off (3,891) (6,975)  
Provision charged to operations 1,626 7,078  
Balance, end of year 10,114 11,498  
Ending balance: individually evaluated for impairment 1,276 1,231  
Ending balance: collectively evaluated for impairment 8,838 10,267  
Ending balance: loans acquired with deteriorated credit quality        
Total 10,114 11,498  
Loans:      
Ending balance 853,970 862,342  
Ending balance: individually evaluated for impairment 6,536 3,401  
Ending balance: collectively evaluated for impairment 846,428 857,872  
Ending balance: loans acquired with deteriorated credit quality 1,006 1,069  
Total Loans 853,970 862,342  
Unallocated [Member]
      
Allowance for loan losses:      
Balance, beginning of the year 81 (38)  
Recoveries credited to allowance        
Loans charged off        
Provision charged to operations (27) 119  
Balance, end of year 54 81  
Ending balance: individually evaluated for impairment        
Ending balance: collectively evaluated for impairment 54 81  
Ending balance: loans acquired with deteriorated credit quality        
Total 54 81  
Loans:      
Ending balance        
Ending balance: individually evaluated for impairment        
Ending balance: collectively evaluated for impairment        
Ending balance: loans acquired with deteriorated credit quality        
Total Loans