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Mortgage Servicing Assets - Schedule of Range and Weighted-Average of Significant Unobservable Inputs (Details) - Discounted cash flow - USD ($) | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Commercial Mortgage Backed Securities | Minimum |  |
Servicing Assets at Fair Value [Line Items] |  |
Expected defaults | 101.00% | 97.00%
Discount rate | 742.00% | 700.00%
Escrow earn rate | 94.00% | 120.00%
Loan assumption rate | 0.00% | 1.00%
Commercial Mortgage Backed Securities | Maximum |  |
Servicing Assets at Fair Value [Line Items] |  |
Expected defaults | 2.00% | 2.00%
Discount rate | 10.59% | 11.42%
Escrow earn rate | 1.22% | 1.92%
Loan assumption rate | 1.75% | 3.37%
Commercial Mortgage Backed Securities | Weighted Average |  |
Servicing Assets at Fair Value [Line Items] |  |
Expected defaults | 1.18% | 1.14%
Discount rate | 9.20% | 9.24%
Escrow earn rate | 1.10% | 1.67%
Loan assumption rate | 1.44% | 1.32%
Agency residential mortgage-backed securities | Minimum |  |
Servicing Assets at Fair Value [Line Items] |  |
Discount rate | 7.51% | 7.50%
Servicing cost | $ 62.00 | $ 62.00
Prepayment speed | 10.55% | 10.50%
Agency residential mortgage-backed securities | Maximum |  |
Servicing Assets at Fair Value [Line Items] |  |
Discount rate | 8.63% | 8.50%
Servicing cost | $ 4,375 | $ 8,375
Prepayment speed | 50.81% | 55.60%
Agency residential mortgage-backed securities | Weighted Average |  |
Servicing Assets at Fair Value [Line Items] |  |
Discount rate | 7.55% | 7.52%
Servicing cost | $ 72.48 | $ 68.14
Prepayment speed | 12.82% | 17.16%

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- Definition Discount rate used to estimate the fair value of servicing assets and servicing liabilities. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=116651436&loc=d3e122596-111746 + Details
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- Definition Percentage of contractually collectible principal associated with a financial asset expected not to be collected due to default by the borrower. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=116651436&loc=d3e122596-111746 + Details
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- Definition Estimated rate of prepayments of principal on servicing assets and servicing liabilities. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=116651436&loc=d3e122596-111746 + Details
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