Commitments and Letters of Credit - Additional Information (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Loss Contingencies [Line Items]
Notional amount of financial standby letters of credit	$ 700,000
Notional amount of performance standby letters of credit	1,300,000
Notional amount of commercial letters of credit	0
Financial instrument of credit risk	100,000	200,000
Unused commitments and letters of credit [Member]
Loss Contingencies [Line Items]
Commitment liability	$ 3,200,000	$ 2,400,000