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Related Party Transactions - Summary of Deposits and Withdrawals Made by Related Parties (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2017
Apr. 01, 2016
Related Party Fund | Affiliated Entity      
Related Party Transaction [Line Items]      
Expense   $ 6,000  
Related Party Fund | Servicing Fees | Affiliated Entity      
Related Party Transaction [Line Items]      
Income   $ 625  
Related Party Fund      
Related Party Transaction [Line Items]      
Equity method investment     $ 10,000
Ownership 23.00% 23.00% 15.00%
Board Member | Related Party Fund      
Related Party Transaction [Line Items]      
Ownership 4.00% 4.00%  
Related Party Fund      
Related Party Transaction [Line Items]      
Loans $ 53,300