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Loans and Allowance for Loan Losses - Activity in Allowance for Loan Losses and Recorded Investments in Loans (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance $ 28,677,000 $ 36,532,000 $ 45,368,000
Provision for loan losses (7,200,000) (3,100,000) 6,900,000
Charge-offs (5,290,000) (12,644,000) (19,897,000)
Recoveries 6,634,000 7,889,000 4,161,000
Ending balance 22,821,000 28,677,000 36,532,000
Ending balance: individually evaluated for impairment 12,386,000 17,189,000 18,996,000
Ending balance: collectively evaluated for impairment 10,435,000 11,488,000 17,536,000
Ending balance 1,053,243,000 1,041,189,000 1,072,422,000
Ending balance: individually evaluated for impairment 36,868,000 57,279,000 70,978,000
Ending balance: collectively evaluated for impairment 1,016,375,000 983,910,000 1,001,444,000
Commercial Loans [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance 26,043,000 33,431,000 42,359,000
Provision for loan losses (6,730,000) (2,800,000) 4,125,000
Charge-offs (5,120,000) (12,075,000) (16,978,000)
Recoveries 6,262,000 7,487,000 3,925,000
Ending balance 20,455,000 26,043,000 33,431,000
Ending balance: individually evaluated for impairment 11,260,000 16,860,000 18,645,000
Ending balance: collectively evaluated for impairment 9,195,000 9,183,000 14,786,000
Ending balance 986,696,000 968,506,000 996,905,000
Ending balance: individually evaluated for impairment 33,240,000 55,138,000 68,893,000
Ending balance: collectively evaluated for impairment 953,456,000 913,368,000 928,012,000
Retail Loans [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance 2,645,000 3,019,000 2,972,000
Provision for loan losses (489,000) (207,000) 2,730,000
Charge-offs (170,000) (569,000) (2,919,000)
Recoveries 372,000 402,000 236,000
Ending balance 2,358,000 2,645,000 3,019,000
Ending balance: individually evaluated for impairment 1,126,000 329,000 351,000
Ending balance: collectively evaluated for impairment 1,232,000 2,316,000 2,668,000
Ending balance 66,547,000 72,683,000 75,517,000
Ending balance: individually evaluated for impairment 3,628,000 2,141,000 2,085,000
Ending balance: collectively evaluated for impairment 62,919,000 70,542,000 73,432,000
Unallocated [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance (11,000) 82,000 37,000
Provision for loan losses 19,000 (93,000) 45,000
Charge-offs 0 0 0
Recoveries 0 0 0
Ending balance 8,000 (11,000) 82,000
Ending balance: individually evaluated for impairment 0 0 0
Ending balance: collectively evaluated for impairment $ 8,000 $ (11,000) $ 82,000