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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
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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

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- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953423-111524 + Details
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- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953423-111524 + Details
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- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953423-111524 + Details
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- Definition Amount of recovery of financing receivables doubtful of collection that were previously charged off. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953423-111524 + Details
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- Definition Amount of direct write-downs of financing receivables charged against the allowance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953423-111524 + Details
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- Definition The balance of financing receivables that were collectively evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953423-111524 + Details
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- Definition Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5074-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522 + Details
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- Definition Amount of expense related to estimated loss from loan and lease transactions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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