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Fair Value - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Impaired loan servicing rights |  | $ 9
Amortized cost |  | 11
Valuation allowance |  | 2
Charge-offs amount of loans |  | 2,638
Valuation allowance of impaired loans | 611 |
Additional provision for loan losses | 1,802 |
Unpaid principal balance of impairment loan - collateral | $ 5,909 | $ 10,069
Period of loan due | 90 days |

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