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Allowance for Loss-Sharing Obligations (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Roll forward of loss contingency accrual          
(Charge-offs) recoveries, net     $ 54 $ (1,844)  
Loss-Sharing Obligation          
Roll forward of loss contingency accrual          
Outstanding advances under the Fannie Mae DUS program $ 100   100   $ 100
Loss-Sharing Obligation | Fannie Mae          
Roll forward of loss contingency accrual          
Beginning balance of the period 31,402 $ 32,797 30,511 32,407  
Provisions for loss sharing 2,924 1,265 5,263 5,410  
Provisions reversal for loan repayments (905) (3,882) (2,423) (5,815)  
(Charge-offs) recoveries, net (16) (22) 54 (1,844)  
Ending balance of the period 33,405 $ 30,158 33,405 $ 30,158  
Maximum quantifiable liability $ 2,380,000   $ 2,380,000   $ 2,240,000