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Allowance for Loan Losses, by Portfolio Segment (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance $ 25,770 $ 26,205 $ 26,482
Provision for loan losses charged to operations 8,208 5,678 9,047
Loans charged off (12,527) (7,504) (11,460)
Recoveries credited to allowance 2,175 1,391 2,136
Net charge-offs (10,352) (6,113) (9,324)
Ending balance 24,077 25,770 26,205
Allowance Excluding Purchased Credit Impaired
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 25,762 26,004 26,482
Provision for loan losses charged to operations 7,912 5,871 8,846
Loans charged off (12,527) (7,504) (11,460)
Recoveries credited to allowance 2,175 1,391 2,136
Net charge-offs (10,352) (6,113) (9,324)
Ending balance 23,322 25,762 26,004
Commercial Loans | Allowance Excluding Purchased Credit Impaired
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 17,259 17,551 12,300
Provision for loan losses charged to operations 5,643 2,896 11,806
Loans charged off (7,743) (3,814) (7,981)
Recoveries credited to allowance 931 626 1,426
Net charge-offs (6,812) (3,188) (6,555)
Ending balance 16,090 17,259 17,551
Consumer Real Estate | Allowance Excluding Purchased Credit Impaired
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 7,906 7,711 12,641
Provision for loan losses charged to operations 1,364 2,608 (2,681)
Loans charged off (3,115) (2,702) (2,501)
Recoveries credited to allowance 442 289 252
Net charge-offs (2,673) (2,413) (2,249)
Ending balance 6,597 7,906 7,711
Consumer and Other | Allowance Excluding Purchased Credit Impaired
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 597 742 1,541
Provision for loan losses charged to operations 905 367 (279)
Loans charged off (1,669) (988) (978)
Recoveries credited to allowance 802 476 458
Net charge-offs (867) (512) (520)
Ending balance $ 635 $ 597 $ 742