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Loans and Allowance for Loan Losses (Details 5) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Changes in allowance for loan losses      
Balance at beginning of period $ 80,987 $ 47,512 $ 37,488
Loans charged-off (21,930) (29,209) (46,817)
Recoveries of loans previously charged off 3,756 2,409 2,559
Net charge-offs (18,174) (26,800) (44,258)
Provision for loan losses 13,697 60,275 54,282
Benefit attributable to FDIC loss share agreements (78) (30,039)  
Total provision for loan losses charged to operations 13,619 30,236  
Provision for loan losses recorded through the FDIC loss share receivable 78 30,039  
Balance at end of period 76,510 80,987 47,512
Non-acquired loans
     
Changes in allowance for loan losses      
Balance at beginning of period 49,367 47,512 37,488
Loans charged-off (21,930) (29,209) (46,817)
Recoveries of loans previously charged off 3,756 2,409 2,559
Net charge-offs (18,174) (26,800) (44,258)
Provision for loan losses 13,185 28,655 54,282
Total provision for loan losses charged to operations 13,185 28,655 54,282
Balance at end of period 44,378 49,367 47,512
Acquired loans
     
Changes in allowance for loan losses      
Balance at beginning of period 31,620    
Provision for loan losses 512 31,620  
Benefit attributable to FDIC loss share agreements (78) (30,039)  
Total provision for loan losses charged to operations 434 1,581  
Provision for loan losses recorded through the FDIC loss share receivable 78 30,039  
Balance at end of period $ 32,132 $ 31,620