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Off Balance Sheet Activities - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Oct. 31, 2015
Fair Value Assets Measured On Recurring Basis Unobservable Input [Line Items]      
Commitments to make loans periods 60 days or less    
Subscription Agreement [Member] | Oxer [Member] | Commitments to Invest [Member]      
Fair Value Assets Measured On Recurring Basis Unobservable Input [Line Items]      
Off-balance sheet risks, amount, liability     $ 5,000
Minimum [Member]      
Fair Value Assets Measured On Recurring Basis Unobservable Input [Line Items]      
Fixed Interest rate loan 1.19% 1.69%  
Fixed rate loan Maturities range 3 months 3 months  
Maximum [Member]      
Fair Value Assets Measured On Recurring Basis Unobservable Input [Line Items]      
Fixed Interest rate loan 18.00% 18.00%  
Fixed rate loan Maturities range 20 years 20 years