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Capitalized Mortgage Servicing Rights - Summary of Capitalized MSRs (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Capitalized Mortgage Servicing Rights |  |  |  |
Beginning balance |  |  | $ 391,254 |
Ending balance | $ 376,403 |  | 376,403 |
MSRs |  |  |  |
Capitalized Mortgage Servicing Rights |  |  |  |
Beginning balance | 380,719 | $ 394,410 | 391,254 | $ 401,471
Additions | 14,476 | 16,550 | 41,877 | 49,416
Amortization | (17,299) | (15,900) | (50,817) | (46,920)
Write-downs and payoffs | (1,493) | (2,857) | (5,911) | (11,764)
Ending balance | 376,403 | 392,203 | 376,403 | 392,203
Expected amortization of capitalized MSRs balances |  |  |  |
2024 (three months ending 12/31/2024) | 17,557 |  | 17,557 |
2025 | 67,899 |  | 67,899 |
2026 | 62,456 |  | 62,456 |
2027 | 57,942 |  | 57,942 |
2028 | 50,678 |  | 50,678 |
Thereafter | 119,871 |  | 119,871 |
Total | 376,403 |  | 376,403 |
Originated |  |  |  |
Capitalized Mortgage Servicing Rights |  |  |  |
Beginning balance | 374,159 | 383,267 | 382,582 | 386,878
Additions | 14,476 | 16,550 | 41,877 | 49,416
Amortization | (16,621) | (14,988) | (48,593) | (43,866)
Write-downs and payoffs | (1,469) | (2,400) | (5,321) | (9,999)
Ending balance | 370,545 | 382,429 | 370,545 | 382,429
Acquired |  |  |  |
Capitalized Mortgage Servicing Rights |  |  |  |
Beginning balance | 6,560 | 11,143 | 8,672 | 14,593
Amortization | (678) | (912) | (2,224) | (3,054)
Write-downs and payoffs | (24) | (457) | (590) | (1,765)
Ending balance | $ 5,858 | $ 9,774 | $ 5,858 | $ 9,774

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