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Commitments and Letters of Credit - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Financial instrument of credit risk $ 0.2 $ 0.2
Notional amount of financial standby letters of credit 0.4  
Notional amount of performance standby letters of credit 10.9  
Notional amount of commercial letters of credit 0.4  
Unused commitments and letters of credit [Member]
    
Commitment liability $ 2.4 $ 1.5