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Litigation, Commitments and Contingencies - Additional Information (Detail) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Commitments and Contingencies [Line Items]    
Commitments to extend credit including availability on lines of credit $ 215,770,000 $ 194,270,000
Gross notional amounts of outstanding commitments 14,840,000 9,150,000
Standby letters of credit and financial guarantees 6,810,000 2,900,000
Reserve for unfunded lending commitments 326,000 329,000
Trust preferred securities $ 15,000,000