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Allowance for Loss-Sharing Obligations (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Roll forward of loss contingency accrual |  |  |
Provisions for loss sharing | $ (6,167) | $ 14,822 | $ 1,147
Guarantee obligations | 34,400 | 34,000 |
Fannie Mae Mortgage |  |  |
Roll forward of loss contingency accrual |  |  |
Allowance for loss sharing obligations | $ 21,700 | $ 30,300 |
Loss-sharing obligations (as a percent) | 0.11% | 0.17% |
Loss-Sharing Obligation |  |  |
Roll forward of loss contingency accrual |  |  |
Outstanding advances under the Fannie Mae DUS program | $ 100 | $ 100 |
Loss-Sharing Obligation | Fannie Mae Mortgage |  |  |
Roll forward of loss contingency accrual |  |  |
Beginning balance of the period | 64,303 | 34,648 |
Provisions for loss sharing | 44 | 16,379 |
Provisions reversal for loan repayments | (6,211) | (1,557) |
Recoveries (charge-offs) , net | (2,072) | 427 |
Ending balance of the period | 56,064 | 64,303 | $ 34,648
Maximum quantifiable liability | 3,600,000 | 3,410,000 |
Loss-Sharing Obligation | Fannie Mae Mortgage | Impact of Adoption | Impact of adopting CECL |  |  |
Roll forward of loss contingency accrual |  |  |
Beginning balance of the period | $ 14,406 |  |
Ending balance of the period |  | $ 14,406 |

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