Mortgage Servicing Rights - Summary of the Weighted Average Discount Rate, Prepayment Speed and Cost to Service Assumptions Used to Determine the Fair Value of MSRs (Details) - USD ($) |
6 Months Ended | 12 Months Ended |
|---|---|---|
Jun. 30, 2021 |
Dec. 31, 2020 |
|
| Minimum | ||
| Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items] | ||
| Discount rate | 9.20% | 9.20% |
| Prepayment rate | 9.10% | 10.00% |
| Cost to service (per loan) | $ 71.8 | $ 71.0 |
| Maximum | ||
| Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items] | ||
| Discount rate | 15.50% | 15.50% |
| Prepayment rate | 30.30% | 38.80% |
| Cost to service (per loan) | $ 454.7 | $ 409.4 |
| Weighted Average | ||
| Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items] | ||
| Discount rate | 10.00% | 10.00% |
| Prepayment rate | 14.90% | 18.20% |
| Cost to service (per loan) | $ 91.0 | $ 92.5 |