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Allowance for Loss-Sharing Obligations (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Roll forward of loss contingency accrual      
Charge-offs, net $ (797) $ (56) $ (1,638)
Fannie Mae      
Roll forward of loss contingency accrual      
Loss-sharing obligations (as a percent) 0.23% 0.25%  
Loss-Sharing Obligation      
Roll forward of loss contingency accrual      
Outstanding advances under the Fannie Mae DUS program $ 500 $ 100  
Loss-Sharing Obligation | Fannie Mae      
Roll forward of loss contingency accrual      
Beginning balance of the period 34,298 30,511  
Provisions for loss sharing 4,879 7,126  
Provisions reversal for loan repayments (3,732) (3,283)  
Charge-offs, net (797) (56)  
Ending balance of the period 34,648 34,298 $ 30,511
Maximum quantifiable liability $ 2,730,000 $ 2,460,000