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Allowance for Loss - Sharing Obligations (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Roll forward of loss contingency accrual      
Provisions for loss sharing $ 3,177 $ (662)  
Guarantee obligations 34,500 34,400  
Allowance for loss sharing obligations $ 25,300   $ 22,700
Loss-sharing obligations (as a percent) 0.13%   0.12%
Impact of adopting CECL $ 2,600    
Loss-Sharing Obligation      
Roll forward of loss contingency accrual      
Outstanding advances under the Fannie Mae DUS program 400   $ 800
Loss-Sharing Obligation | Fannie Mae Mortgage      
Roll forward of loss contingency accrual      
Beginning balance 57,168 56,064 56,064
Provisions for loss sharing 4,567 133  
Provisions reversal for loan repayments (1,390) (795)  
Recoveries (charge-offs), net (588) (230)  
Ending balance 59,757 $ 55,172 57,168
Maximum quantifiable liability $ 3,580,000   $ 3,490,000