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Allowance for Loan Losses, by Portfolio Segment (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance $ 24,850 $ 25,800 $ 25,770 $ 26,205
Provision for loan losses 3,205 1,620 4,347 2,542
Loans charged off (5,006) (1,612) (7,765) (3,174)
Recoveries credited to allowance 73 363 770 598
Net charge-offs (4,933) (1,249) (6,995) (2,576)
Ending balance 23,122 26,171 23,122 26,171
Commercial Loans
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance 17,250 17,865 17,267 17,752
Provision for loan losses 2,304 950 2,787 1,216
Loans charged off (3,446) (836) (4,229) (1,086)
Recoveries credited to allowance (227) 278 56 375
Net charge-offs (3,673) (558) (4,173) (711)
Ending balance 15,881 18,257 15,881 18,257
Consumer Real Estate
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance 7,003 7,259 7,906 7,711
Provision for loan losses 749 623 1,229 1,237
Loans charged off (1,282) (619) (2,678) (1,727)
Recoveries credited to allowance 188 9 201 51
Net charge-offs (1,094) (610) (2,477) (1,676)
Ending balance 6,658 7,272 6,658 7,272
Consumer and Other
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance 597 676 597 742
Provision for loan losses 152 47 331 89
Loans charged off (278) (157) (858) (361)
Recoveries credited to allowance 112 76 513 172
Net charge-offs (166) (81) (345) (189)
Ending balance $ 583 $ 642 $ 583 $ 642