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Allowance for Loan Losses, Excluding PCI Loans, by Loan Segment (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 charged to operations (2,439) 2,333 633 6,680
Loans charged off (1,118) (3,022) (5,119) (11,511)
Recoveries credited to allowance 915 1,420 2,019 2,914
Net (charge-offs) recoveries (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 charged to operations (2,335) 2,110 733 6,457
Loans charged off (1,118) (3,022) (5,119) (11,511)
Recoveries credited to allowance 915 1,420 2,019 2,914
Net (charge-offs) recoveries (203) (1,602) (3,100) (8,597)
Ending balance 20,955 23,622 20,955 23,622
Commercial Loans | Allowance Excluding Purchased Credit Impaired
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance 16,747 15,873 16,090 17,259
Provision for (recovery of) loan losses charged to operations (3,131) 1,551 (478) 4,338
Loans charged off (558) (2,561) (2,839) (7,394)
Recoveries credited to allowance 613 1,194 898 1,854
Net (charge-offs) recoveries 55 (1,367) (1,941) (5,540)
Ending balance 13,671 16,057 13,671 16,057
Consumer Real Estate | Allowance Excluding Purchased Credit Impaired
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance 6,123 6,658 6,597 7,906
Provision for (recovery of) loan losses charged to operations 561 (807) 592 422
Loans charged off (219) 1,026 (1,184) (1,747)
Recoveries credited to allowance 192 39 652 335
Net (charge-offs) recoveries (27) 1,065 (532) (1,412)
Ending balance 6,657 6,916 6,657 6,916
Consumer and Other | Allowance Excluding Purchased Credit Impaired
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance 623 583 635 597
Provision for (recovery of) loan losses charged to operations 235 1,366 619 1,697
Loans charged off (341) (1,487) (1,096) (2,370)
Recoveries credited to allowance 110 187 469 725
Net (charge-offs) recoveries (231) (1,300) (627) (1,645)
Ending balance $ 627 $ 649 $ 627 $ 649