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Fair Values of Assets and Liabilities - Additional Information (Detail) (USD $) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Jun. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011 | Mar. 31, 2012 | Dec. 31, 2011
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |
Interest rate swaps transferred into Level 3 from Level 2 |  |  |  | $ 500,000 | $ 4,500,000 |  |
Corporate securities transferred from Level 3 to Level 2 | 0 | (4,520,000) | 12,000,000 |  | 11,965,000 |  |
Impaired loans considered to be credit risk of non-collection | 100,000 |  |  | 100,000 |  |  |
Updated appraisal requirement floor | 250,000 |  |  | 250,000 |  |  |
Other real estate book cost | 16,000,000 |  |  | 16,000,000 |  |  |
Sale of other real estate | 1,200,000 |  |  | 1,200,000 |  | 6,800,000 |
Loss on sale of other real estate |  |  |  |  |  | 300,000 |
Gain on sale of other real estate | 600,000 |  |  |  |  |  |
Financial instrument of credit risk | $ 200,000 |  |  | $ 200,000 |  |  | $ 100,000

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