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Off Balance Sheet Activities - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Feb. 28, 2017
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 $ 3,290        
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
Subscription Agreement [Member] | Tecum [Member]          
Fair Value Assets Measured On Recurring Basis Unobservable Input [Line Items]          
Capital contributions $ 1,167        
Subscription Agreement [Member] | Tecum [Member] | Commitments to Invest [Member]          
Fair Value Assets Measured On Recurring Basis Unobservable Input [Line Items]          
Off-balance sheet risks, amount, liability     $ 3,000    
Minimum [Member]          
Fair Value Assets Measured On Recurring Basis Unobservable Input [Line Items]          
Fixed Interest rate loan 1.00% 1.19%      
Fixed rate loan Maturities range 8 months 6 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 30 years 30 years