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Allowance For Loan Losses for PCI Loans, by Loan Segment (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance $ 20,258 $ 23,911 $ 20,227 $ 24,077
Benefit (provision) attributable to FDIC indemnification asset 75 110 29 451
Provision for (recovery of) loan losses charged to operations 381 (2,439) 1,757 633
Ending balance 20,127 21,159 20,127 21,159
Purchased Credit Impaired        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance 114 418 58 755
Recovery of PCI loan losses (94) (214) (38) (551)
Benefit (provision) attributable to FDIC indemnification asset 75 110 29 451
Provision for (recovery of) loan losses charged to operations (19) (104) (9) (100)
(Recovery of) provision for loan losses recorded through the FDIC indemnification asset (75) (110) (29) (451)
Ending balance 20 204 20 204
Commercial Loans | Purchased Credit Impaired        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance   16 37 77
Recovery of PCI loan losses   (8) (37) (69)
Benefit (provision) attributable to FDIC indemnification asset     30 55
Provision for (recovery of) loan losses charged to operations   (8) (7) (14)
(Recovery of) provision for loan losses recorded through the FDIC indemnification asset     (30) (55)
Ending balance   8   8
Consumer Real Estate | Purchased Credit Impaired        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance 114 402 21 678
Recovery of PCI loan losses (94) (206) (1) (482)
Benefit (provision) attributable to FDIC indemnification asset 75 110 (1) 396
Provision for (recovery of) loan losses charged to operations (19) (96) (2) (86)
(Recovery of) provision for loan losses recorded through the FDIC indemnification asset (75) (110) 1 (396)
Ending balance $ 20 $ 196 $ 20 $ 196