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Loans and Allowance for Loan Losses (Details 5) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Changes in allowance for loan losses        
Balance at beginning of period $ 83,082 $ 73,725 $ 80,987 $ 47,512
Loans charged-off (5,940) (7,858) (17,193) (21,950)
Recoveries of loans previously charged off 610 681 3,075 1,863
Net charge-offs (5,330) (7,177) (14,118) (20,087)
Provision for loan losses (175) 12,432 10,708 51,555
Benefit attributable to FDIC loss share agreements 4,219 (4,109) 700 (28,376)
Total provision for loan losses charged to operations 4,044 8,323 11,408 23,179
Provision for loan losses recorded through the FDIC loss share receivable (4,219) 4,109 (700) 28,376
Balance at end of period 77,577 78,980 77,577 78,980
Acquired loans
       
Changes in allowance for loan losses        
Balance at beginning of period 35,813 25,545 31,620  
Provision for loan losses (4,675) 4,325 (482) 29,870
Benefit attributable to FDIC loss share agreements 4,219 (4,109) 700 (28,376)
Total provision for loan losses charged to operations (456) 216 218 1,494
Provision for loan losses recorded through the FDIC loss share receivable (4,219) 4,109 (700) 28,376
Balance at end of period 31,138 29,870 31,138 29,870
Non-acquired loans
       
Changes in allowance for loan losses        
Balance at beginning of period 47,269 48,180 49,367 47,512
Loans charged-off (5,940) (7,858) (17,193) (21,950)
Recoveries of loans previously charged off 610 681 3,075 1,863
Net charge-offs (5,330) (7,177) (14,118) (20,087)
Provision for loan losses 4,500 8,107 11,190 21,685
Total provision for loan losses charged to operations 4,500 8,107 11,190 21,685
Balance at end of period $ 46,439 $ 49,110 $ 46,439 $ 49,110