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
 6 Months Ended 12 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2011
Allowance for loan losses:      
Balance, beginning of the year $ 39,470 $ 38,406  
Recoveries credited to allowance 691 2,130  
Loans charged off (5,676) (17,866)  
Provision charged to operations 6,500 16,800  
Balance, end of year 40,985 39,470  
Ending balance: collectively evaluated for impairment 29,485 29,172  
Ending balance: loans acquired with deteriorated credit quality 221 85  
Total Allowance for loan losses 40,985 39,470  
Ending balance: individually evaluated for impairment 11,279 10,213  
Loans:      
Ending balance 2,887,790 2,818,583 2,859,569
Ending balance: individually evaluated for impairment 182,624 232,936  
Ending balance: collectively evaluated for impairment 2,698,391 2,575,750  
Ending balance: loans acquired with deteriorated credit quality 6,775 9,897  
Total Loans 2,887,790 2,818,583 2,859,569
Commercial [Member]
      
Allowance for loan losses:      
Balance, beginning of the year 27,891 28,255  
Recoveries credited to allowance 127 924  
Loans charged off (2,950) (10,891)  
Provision charged to operations 5,485 9,603  
Balance, end of year 30,553 27,891  
Ending balance: collectively evaluated for impairment 19,903 18,824  
Ending balance: loans acquired with deteriorated credit quality 221 85  
Total Allowance for loan losses 30,553 27,891  
Ending balance: individually evaluated for impairment 10,429 8,982  
Loans:      
Ending balance 2,035,547 1,956,241  
Ending balance: individually evaluated for impairment 176,919 229,535  
Ending balance: collectively evaluated for impairment 1,852,887 1,717,878  
Ending balance: loans acquired with deteriorated credit quality 5,741 8,828  
Total Loans 2,035,547 1,956,241  
Consumer [Member]
      
Allowance for loan losses:      
Balance, beginning of the year 11,498 10,189  
Recoveries credited to allowance 564 1,206  
Loans charged off (2,726) (6,975)  
Provision charged to operations 988 7,078  
Balance, end of year 10,324 11,498  
Ending balance: collectively evaluated for impairment 9,474 10,267  
Ending balance: loans acquired with deteriorated credit quality        
Total Allowance for loan losses 10,324 11,498  
Ending balance: individually evaluated for impairment 850 1,231  
Loans:      
Ending balance 852,243 862,342  
Ending balance: individually evaluated for impairment 5,705 3,401  
Ending balance: collectively evaluated for impairment 845,504 857,872  
Ending balance: loans acquired with deteriorated credit quality 1,034 1,069  
Total Loans 852,243 862,342  
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 108 81  
Ending balance: collectively evaluated for impairment 108 81  
Ending balance: loans acquired with deteriorated credit quality        
Total Allowance for loan losses 108 81  
Ending balance: individually evaluated for impairment        
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