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Allowance for Loss - Sharing Obligations (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Roll forward of loss contingency accrual          
Provisions for loss sharing $ 1,679 $ 412 $ 12,528 $ (2,199)  
Guarantee obligations 34,600 34,200 34,600 34,200  
Allowance for loss sharing obligations 34,700   $ 34,700   $ 22,700
Loss-sharing obligations (as a percent)     0.17%   0.12%
Impact of adopting CECL 2,500   $ 11,900    
Loss-Sharing Obligation          
Roll forward of loss contingency accrual          
Outstanding advances under the Fannie Mae DUS program 300   300   $ 800
Loss-Sharing Obligation | Fannie Mae Mortgage          
Roll forward of loss contingency accrual          
Beginning balance 66,681 53,053 57,168 56,064 56,064
Provisions for loss sharing 1,703 2,346 13,992 2,593  
Provisions reversal for loan repayments (24) (1,934) (1,464) (4,792)  
Recoveries (charge-offs), net 901 46 (435) (354)  
Ending balance 69,261 $ 53,511 69,261 $ 53,511 57,168
Maximum quantifiable liability $ 3,790,000   $ 3,790,000   $ 3,490,000