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Commitments and Contingencies - Repurchase Reserve (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2019
Repurchase reserve      
Beginning balance $ 6,020 $ 5,408  
Provision for repurchases 5,074 1,557  
Settlements (3,437) (945)  
Total repurchase reserve 7,657 6,020  
Loans subject to representations and warranties $ 4,100 $ 6,900  
ASU 2016-02 | Restatement adjustment | Minimum      
Repurchase reserve      
Right of use asset     $ 19,000
Lease liabilities     22,000
ASU 2016-02 | Restatement adjustment | Maximum      
Repurchase reserve      
Right of use asset     21,000
Lease liabilities     $ 24,000
HARP      
Repurchase reserve      
Threshold period to stay current for loans to limit representation and warranty risk 12 months    
Non-HARP      
Repurchase reserve      
Threshold period to stay current for loans to limit representation and warranty risk 36 months