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Capitalized Mortgage Servicing Rights | 12 Months Ended
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Dec. 31, 2021
Capitalized Mortgage Servicing Rights |
Capitalized Mortgage Servicing Rights | Note 5 — Capitalized Mortgage Servicing Rights Our capitalized MSRs reflect commercial real estate MSRs derived from loans sold in our Agency Business or acquired MSRs. The weighted average estimated life remaining of our MSRs was 8.5 years and 8.6 years at December 31, 2021 and 2020, respectively. A summary of our capitalized MSR activity is as follows (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31, 2021 | ​ | Year Ended December 31, 2020
​ |  | Originated |  | Acquired |  | Total |  | Originated |  | Acquired |  | Total
Beginning balance | ​ | $ | 336,466 | ​ | $ | 43,508 | ​ | $ | 379,974 | ​ | $ | 221,901 | ​ | $ | 64,519 | ​ | $ | 286,420
Additions | ​ | ​ | 134,116 | ​ | ​ | — | ​ | ​ | 134,116 | ​ | ​ | 159,533 | ​ | ​ | — | ​ | ​ | 159,533
Amortization | ​ | ​ | (47,845) | ​ | ​ | (10,770) | ​ | ​ | (58,615) | ​ | ​ | (34,186) | ​ | ​ | (15,036) | ​ | ​ | (49,222)
Write-downs and payoffs | ​ | ​ | (27,164) | ​ | ​ | (5,577) | ​ | ​ | (32,741) | ​ | ​ | (10,782) | ​ | ​ | (5,975) | ​ | ​ | (16,757)
Ending balance | ​ | $ | 395,573 | ​ | $ | 27,161 | ​ | $ | 422,734 | ​ | $ | 336,466 | ​ | $ | 43,508 | ​ | $ | 379,974
​ We collected prepayment fees totaling $38.2 million and $12.8 million during 2021 and 2020, respectively, which are included as a component of servicing revenue, net on the consolidated statements of income. As of December 31, 2021 and 2020, we had no valuation allowance recorded on any of our MSRs. The expected amortization of capitalized MSRs recorded as of December 31, 2021 is as follows (in thousands): ​
​ | ​ | ​ | ​
Year |  | Amortization
2022 |  | $ | 58,814
2023 |  | ​ | 55,777
2024 |  | ​ | 53,179
2025 |  | ​ | 50,610
2026 | ​ | ​ | 46,582
Thereafter |  | ​ | 157,772
Total | ​ | $ | 422,734
​ Actual amortization may vary from these estimates.

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