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Allowance for Loan Losses, by Portfolio Segment (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance   $ 26,482  
Beginning balance 26,205 26,482 24,277
Provision for loan losses 5,678 9,047 14,757
Loans charged off (7,504) (11,460) (13,602)
Recoveries credited to allowance 1,391 2,136 1,050
Net charge-offs (6,113) (9,324) (12,552)
Ending balance 25,770 26,205 26,482
Commercial Loans
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance   12,300  
Beginning balance 17,752 12,518 13,607
Provision for loan losses 2,703 12,007 6,552
Loans charged off (3,814) (7,981) (7,980)
Recoveries credited to allowance 626 1,426 339
Net charge-offs (3,188) (6,555) (7,641)
Ending balance 17,267 17,752 12,518
Consumer Real Estate
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance   12,641  
Beginning balance 7,711 12,200 8,337
Provision for loan losses 2,608 (2,681) 8,106
Loans charged off (2,702) (2,501) (4,352)
Recoveries credited to allowance 289 252 109
Net charge-offs (2,413) (2,249) (4,243)
Ending balance 7,906 7,711 12,200
Consumer and Other
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance   1,541  
Beginning balance 742 1,764 2,333
Provision for loan losses 367 (279) 99
Loans charged off (988) (978) (1,270)
Recoveries credited to allowance 476 458 602
Net charge-offs (512) (520) (668)
Ending balance $ 597 $ 742 $ 1,764