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Commitments and Contingencies - Summary of Allowance for Loan Repurchases or Indemnifications (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Commitments And Contingencies Disclosure [Abstract]      
Balance at beginning of period $ 2,156 $ 828  
Provision for loan repurchases or indemnifications 512 1,375 $ 161
Recoveries on previous losses 9    
Losses on loans repurchased or indemnified (18) (47)  
Balance at end of period $ 2,659 $ 2,156 $ 828