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Litigation, Commitments and Contingencies - Additional Information (Detail) (USD $) | Mar. 31, 2013 | Dec. 31, 2012
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Commitments and Contingencies [Line Items] |  |
Commitments to extend credit including availability on lines of credit | $ 198,040,000 | $ 215,770,000
Gross notional amounts of outstanding commitments | 14,100,000 | 14,840,000
Standby letters of credit and financial guarantees | 5,890,000 | 6,810,000
Reserve for unfunded lending commitments | 326,000 | 326,000
Trust preferred securities | $ 15,000,000 |

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