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Aggregate Activity in Allowance For Loan Losses (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance $ 23,911 $ 23,122 $ 24,077 $ 25,770
Provision for (recovery of) loan losses (2,549) 3,145 182 7,492
Benefit attributable to the FDIC indemnification asset 110 (812) 451 (812)
Provision for (recovery of) loan losses charged to operations (2,439) 2,333 633 6,680
Provision for (recovery of) loan losses recorded through the FDIC indemnification asset (110) 812 (451) 812
Charge-offs (1,118) (3,022) (5,119) (11,511)
Recoveries 915 1,420 2,019 2,914
Net charge-offs (203) (1,602) (3,100) (8,597)
Ending balance 21,159 24,665 21,159 24,665
Allowance Excluding Purchased Credit Impaired
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance 23,493 23,114 23,322 25,762
Provision for (recovery of) loan losses (2,335) 2,110 733 6,457
Provision for (recovery of) loan losses charged to operations (2,335) 2,110 733 6,457
Charge-offs (1,118) (3,022) (5,119) (11,511)
Recoveries 915 1,420 2,019 2,914
Net charge-offs (203) (1,602) (3,100) (8,597)
Ending balance 20,955 23,622 20,955 23,622
Purchased Credit Impaired
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance 418 8 755 8
Provision for (recovery of) loan losses (214) 1,035 (551) 1,035
Benefit attributable to the FDIC indemnification asset 110 (812) 451 (812)
Provision for (recovery of) loan losses charged to operations (104) 223 (100) 223
Provision for (recovery of) loan losses recorded through the FDIC indemnification asset (110) 812 (451) 812
Ending balance $ 204 $ 1,043 $ 204 $ 1,043