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Allowance for Loan Losses, Excluding PCI Loans, by Loan Segment (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]    
Beginning balance $ 24,077 $ 25,770
Provision for loan losses charged to operations 1,793 1,142
Loans charged off (2,216) (2,759)
Recoveries credited to allowance 347 697
Net charge-offs (1,869) (2,062)
Ending balance 23,798 24,850
Allowance Excluding Purchased Credit Impaired
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Beginning balance 23,322 25,762
Provision for loan losses charged to operations 1,852 1,142
Loans charged off (2,216) (2,759)
Recoveries credited to allowance 347 697
Net charge-offs (1,869) (2,062)
Ending balance 23,305 24,842
Commercial Loans | Allowance Excluding Purchased Credit Impaired
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Beginning balance 16,090 17,259
Provision for loan losses charged to operations 1,218 483
Loans charged off (1,051) (783)
Recoveries credited to allowance 82 283
Net charge-offs (969) (500)
Ending balance 16,339 17,242
Consumer Real Estate | Allowance Excluding Purchased Credit Impaired
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Beginning balance 6,597 7,906
Provision for loan losses charged to operations 485 480
Loans charged off (710) (1,396)
Recoveries credited to allowance 21 13
Net charge-offs (689) (1,383)
Ending balance 6,393 7,003
Consumer and Other | Allowance Excluding Purchased Credit Impaired
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Beginning balance 635 597
Provision for loan losses charged to operations 149 179
Loans charged off (455) (580)
Recoveries credited to allowance 244 401
Net charge-offs (211) (179)
Ending balance $ 573 $ 597