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Off Balance Sheet Activities - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Sep. 30, 2016
Oct. 31, 2015
Fair Value Assets Measured On Recurring Basis Unobservable Input [Line Items]        
Commitments to make loans periods 60 days or less      
Fixed Interest rate loan     5.75%  
Subscription Agreement [Member] | Oxer [Member]        
Fair Value Assets Measured On Recurring Basis Unobservable Input [Line Items]        
Capital contributions $ 2,383      
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% 1.19%    
Fixed rate loan Maturities range 6 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 50 years 50 years