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Guarantees, Commitments and Contingencies - Summary of Commitments and Contingent Liabilities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Standby Letters of Credit [Member]    
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]    
Commitments and contingent liabilities $ 683 $ 833
Commitments to Extend Credit [Member]    
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]    
Commitments and contingent liabilities $ 39,703 $ 31,644