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 ($) |
3 Months Ended | 12 Months Ended |
---|---|---|
Mar. 31, 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 | 9.00% | 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 | 28.10% | 38.80% |
Cost to service (per loan) | $ 261.3 | $ 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 | 13.10% | 18.20% |
Cost to service (per loan) | $ 91.6 | $ 92.5 |