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Capitalized Mortgage Servicing Rights (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Capitalized Mortgage Servicing Rights |  |
Balance at beginning of period | $ 273,770 |
Balance at end of period | 286,420 | $ 273,770
Expected amortization of capitalized MSRs balances |  |
2020 | 5,249 |
2021 | 4,691 |
2022 | 4,691 |
2023 | 4,691 |
2024 | 3,259 |
MSRs |  |
Capitalized Mortgage Servicing Rights |  |
Balance at beginning of period | 273,770 | 252,608
Additions | 83,756 | 94,344
Amortization | (48,681) | (48,124)
Write-downs and payoffs | (22,425) | (25,058)
Balance at end of period | 286,420 | 273,770
Prepayment fees collected | 18,400 | 21,900
Valuation allowance | 0 | $ 0
Expected amortization of capitalized MSRs balances |  |
2020 | 46,307 |
2021 | 42,538 |
2022 | 37,596 |
2023 | 33,203 |
2024 | 28,981 |
Thereafter | 97,795 |
Total | $ 286,420 |
MSRs | Weighted average |  |
Capitalized Mortgage Servicing Rights |  |
Estimated life remaining | 8 years | 7 years 7 months 6 days
Acquired MSRs |  |
Capitalized Mortgage Servicing Rights |  |
Balance at beginning of period | $ 97,084 | $ 143,270
Amortization | (21,042) | (28,958)
Write-downs and payoffs | (11,523) | (17,228)
Balance at end of period | 64,519 | 97,084
Originated MSRs |  |
Capitalized Mortgage Servicing Rights |  |
Balance at beginning of period | 176,686 | 109,338
Additions | 83,756 | 94,344
Amortization | (27,639) | (19,166)
Write-downs and payoffs | (10,902) | (7,830)
Balance at end of period | $ 221,901 | $ 176,686

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=116651436&loc=d3e122739-111746 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7524895&loc=d3e120260-111741 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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