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Related Party Transactions - Summary of Deposits and Withdrawals Made by Related Parties (Detail) - USD ($)
3 Months Ended
Mar. 31, 2016
Apr. 01, 2016
Dec. 31, 2015
Minimum      
Related Party Transaction [Line Items]      
Related party transaction threshold $ 120,000    
Related Party Fund      
Related Party Transaction [Line Items]      
Loans 114,500,000    
Related Party Fund | Affiliated Entity      
Related Party Transaction [Line Items]      
Expense 2,000,000    
Related Party Fund | Servicing Fees | Affiliated Entity      
Related Party Transaction [Line Items]      
Income 380,000    
Related Party Fund | Management Fees | Affiliated Entity      
Related Party Transaction [Line Items]      
Income 15,000    
Related Party Fund      
Related Party Transaction [Line Items]      
Equity method investment $ 10,000,000    
Related Party Fund | Subsequent Event      
Related Party Transaction [Line Items]      
Ownership   15.00%  
Equity method investment   $ 10,000,000  
Related Party Fund | Chief Executive Officer      
Related Party Transaction [Line Items]      
Ownership 8.00%   2.00%
Additional investment $ 4,000,000    
Related Party Fund | Chief Executive Officer | Subsequent Event      
Related Party Transaction [Line Items]      
Ownership   8.00%  
Related Party Fund | Director      
Related Party Transaction [Line Items]      
Ownership     10.00%
Related Party Fund | Director | Subsequent Event      
Related Party Transaction [Line Items]      
Ownership   8.00%  
Related Party Fund | The Company, CEO, and Director | Subsequent Event      
Related Party Transaction [Line Items]      
Ownership   31.00%