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Capitalized Mortgage Servicing Rights (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Capitalized Mortgage Servicing Rights |  |
Balance at beginning of the year | $ 379,974 |
Balance at end of the year | 422,734 | $ 379,974
MSRs |  |
Capitalized Mortgage Servicing Rights |  |
Balance at beginning of the year | 379,974 | 286,420
Additions | 134,116 | 159,533
Amortization | (58,615) | (49,222)
Write-downs and payoffs | (32,741) | (16,757)
Balance at end of the year | 422,734 | 379,974
Prepayment fees collected | 38,200 | $ 12,800
Valuation allowance | 0 |
Expected amortization of capitalized MSRs balances |  |
2022 | 58,814 |
2023 | 55,777 |
2024 | 53,179 |
2025 | 50,610 |
2026 | 46,582 |
Thereafter | 157,772 |
Total | $ 422,734 |
MSRs | Weighted average |  |
Capitalized Mortgage Servicing Rights |  |
Estimated life remaining | 8 years 6 months | 8 years 7 months 6 days
Originated MSRs |  |
Capitalized Mortgage Servicing Rights |  |
Balance at beginning of the year | $ 336,466 | $ 221,901
Additions | 134,116 | 159,533
Amortization | (47,845) | (34,186)
Write-downs and payoffs | (27,164) | (10,782)
Balance at end of the year | 395,573 | 336,466
Acquired MSRs |  |
Capitalized Mortgage Servicing Rights |  |
Balance at beginning of the year | 43,508 | 64,519
Amortization | (10,770) | (15,036)
Write-downs and payoffs | (5,577) | (5,975)
Balance at end of the year | $ 27,161 | $ 43,508

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- Definition Amortized amount of contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=125521744&loc=d3e122739-111746 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122492-111745 Reference 3: http://www.xbrl.org/2003/role/recommendedDisclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745 + Details
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