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Allowance for Loan Losses, Excluding PCI Loans, by Loan Segment (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance $ 23,798 $ 24,850 $ 24,077 $ 25,770
Provision for loan losses charged to operations 1,279 3,205 3,072 4,347
Loans charged off (1,785) (5,535) (4,001) (8,294)
Recoveries credited to allowance 757 602 1,104 1,299
Net charge-offs (1,028) (4,933) (2,897) (6,995)
Ending balance 23,911 23,122 23,911 23,122
Allowance Excluding Purchased Credit Impaired
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance 23,305 24,842 23,322 25,762
Provision for loan losses charged to operations 1,216 3,205 3,068 4,347
Loans charged off (1,785) (5,535) (4,001) (8,294)
Recoveries credited to allowance 757 602 1,104 1,299
Net charge-offs (1,028) (4,933) (2,897) (6,995)
Ending balance 23,493 23,114 23,493 23,114
Commercial Loans | Allowance Excluding Purchased Credit Impaired
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance 16,339 17,242 16,090 17,259
Provision for loan losses charged to operations 1,436 2,304 2,653 2,787
Loans charged off (1,231) (3,885) (2,281) (4,668)
Recoveries credited to allowance 203 212 285 495
Net charge-offs (1,028) (3,673) (1,996) (4,173)
Ending balance 16,747 15,873 16,747 15,873
Consumer Real Estate | Allowance Excluding Purchased Credit Impaired
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance 6,393 7,003 6,597 7,906
Provision for loan losses charged to operations (454) 749 31 1,229
Loans charged off (255) (1,347) (965) (2,743)
Recoveries credited to allowance 439 253 460 266
Net charge-offs 184 (1,094) (505) (2,477)
Ending balance 6,123 6,658 6,123 6,658
Consumer and Other | Allowance Excluding Purchased Credit Impaired
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance 573 597 635 597
Provision for loan losses charged to operations 234 152 384 331
Loans charged off (299) (303) (755) (883)
Recoveries credited to allowance 115 137 359 538
Net charge-offs (184) (166) (396) (345)
Ending balance $ 623 $ 583 $ 623 $ 583