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Litigation, Commitments and Contingencies - Additional Information (Detail) (USD $)
Sep. 30, 2013
Dec. 31, 2012
Commitments and Contingencies [Line Items]    
Commitments to extend credit including availability on lines of credit $ 209,000,000 $ 215,770,000
Gross notional amounts of outstanding commitments 1,090,000 14,840,000
Standby letters of credit and financial guarantees 1,770,000 6,810,000
Reserve for unfunded lending commitments 326,000 326,000
Trust preferred securities $ 15,000,000