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Loans and Allowance for Loan Losses - Activity in Allowance for Loan Losses and the Recorded Investments in Loans (Detail) (USD $) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Beginning balance | $ 24,947,000 | $ 29,689,000 | $ 28,677,000 | $ 36,532,000 |
Provision for loan losses | (1,700,000) | (400,000) | (4,700,000) | (3,400,000) |
Charge-offs | (85,000) | (1,891,000) | (2,881,000) | (11,175,000) |
Recoveries | 2,033,000 | 364,000 | 4,099,000 | 5,805,000 |
Ending balance | 25,195,000 | 27,762,000 | 25,195,000 | 27,762,000 |
Ending balance: individually evaluated for impairment | 15,063,000 | 15,803,000 | 15,063,000 | 15,803,000 |
Ending balance: collectively evaluated for impairment | 10,132,000 | 11,959,000 | 10,132,000 | 11,959,000 |
Ending balance | 1,075,487,000 | 1,035,288,000 | 1,075,487,000 | 1,035,288,000 | 1,041,189,000
Ending balance: individually evaluated for impairment | 50,277,000 | 63,214,000 | 50,277,000 | 63,214,000 |
Ending balance: collectively evaluated for impairment | 1,025,210,000 | 972,074,000 | 1,025,210,000 | 972,074,000 |
Commercial Loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Beginning balance | 22,382,000 | 26,471,000 | 26,043,000 | 33,431,000 |
Provision for loan losses | (1,730,000) | (355,000) | (4,375,000) | (3,480,000) |
Charge-offs | 0 | (1,548,000) | (2,774,000) | (10,662,000) |
Recoveries | 2,002,000 | 326,000 | 3,760,000 | 5,605,000 |
Ending balance | 22,654,000 | 24,894,000 | 22,654,000 | 24,894,000 |
Ending balance: individually evaluated for impairment | 13,860,000 | 15,498,000 | 13,860,000 | 15,498,000 |
Ending balance: collectively evaluated for impairment | 8,794,000 | 9,396,000 | 8,794,000 | 9,396,000 |
Ending balance | 1,007,763,000 | 957,411,000 | 1,007,763,000 | 957,411,000 | 968,506,000
Ending balance: individually evaluated for impairment | 46,426,000 | 61,378,000 | 46,426,000 | 61,378,000 |
Ending balance: collectively evaluated for impairment | 961,337,000 | 896,033,000 | 961,337,000 | 896,033,000 |
Retail Loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Beginning balance | 2,559,000 | 3,167,000 | 2,645,000 | 3,019,000 |
Provision for loan losses | (7,000) | (35,000) | (379,000) | 121,000 |
Charge-offs | (85,000) | (343,000) | (107,000) | (513,000) |
Recoveries | 31,000 | 38,000 | 339,000 | 200,000 |
Ending balance | 2,498,000 | 2,827,000 | 2,498,000 | 2,827,000 |
Ending balance: individually evaluated for impairment | 1,203,000 | 305,000 | 1,203,000 | 305,000 |
Ending balance: collectively evaluated for impairment | 1,295,000 | 2,522,000 | 1,295,000 | 2,522,000 |
Ending balance | 67,724,000 | 77,877,000 | 67,724,000 | 77,877,000 | 72,683,000
Ending balance: individually evaluated for impairment | 3,851,000 | 1,836,000 | 3,851,000 | 1,836,000 |
Ending balance: collectively evaluated for impairment | 63,873,000 | 76,041,000 | 63,873,000 | 76,041,000 |
Unallocated [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Beginning balance | 6,000 | 51,000 | (11,000) | 82,000 |
Provision for loan losses | 37,000 | (10,000) | 54,000 | (41,000) |
Charge-offs | 0 | 0 | 0 | 0 |
Recoveries | 0 | 0 | 0 | 0 |
Ending balance | 43,000 | 41,000 | 43,000 | 41,000 |
Ending balance: individually evaluated for impairment | 0 | 0 | 0 | 0 |
Ending balance: collectively evaluated for impairment | 43,000 | 41,000 | 43,000 | 41,000 |
Ending balance |  |  |  |  |
Ending balance: individually evaluated for impairment |  |  |  |  |
Ending balance: collectively evaluated for impairment |  |  |  |  |

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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 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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