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Investment Securities - Summary of Securities Available for Sale (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Debt securities AFS: |  |  |  |
Amortized Cost |  | $ 2,122,680,000 | $ 2,429,808,000 |
Gross Unrealized Gains |  | 337,000 | 6,199,000 |
Gross Unrealized Losses |  | (299,774,000) | (290,948,000) |
Fair Value |  | 1,823,243,000 | 2,145,059,000 |
Debt securities HTM: |  |  |  |
Amortized Cost |  | 252,385,000 | 263,912,000 |
Gross Unrealized Gains |  | 0 | 0 |
Gross Unrealized Losses |  | (21,261,000) | (13,394,000) |
Fair Value |  | 231,124,000 | 250,518,000 |
Accrued interest receivable for investment securities available for sale |  | $ 7,600,000 | $ 11,000,000.0 |
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] |  | Accrued interest receivable | Accrued interest receivable |
Unrealized gains on securities available for sale net of taxes |  | $ (227,872,000) | $ (204,738,000) |
Net gains on sales of securities available for sale |  | 936,000 | 0 | $ 0
Available-for-sale Securities |  |  |  |
Debt securities HTM: |  |  |  |
Unrealized gains on securities available for sale net of taxes |  | (210,500,000) | (200,200,000) |
CMOs |  |  |  |
Debt securities AFS: |  |  |  |
Amortized Cost |  | 861,179,000 | 888,631,000 |
Gross Unrealized Gains |  | 152,000 | 367,000 |
Gross Unrealized Losses |  | (139,425,000) | (141,279,000) |
Fair Value |  | 721,906,000 | 747,719,000 |
Residential |  |  |  |
Debt securities AFS: |  |  |  |
Amortized Cost |  | 473,099,000 | 499,431,000 |
Gross Unrealized Gains |  | 0 | 0 |
Gross Unrealized Losses |  | (86,039,000) | (79,133,000) |
Fair Value |  | 387,060,000 | 420,298,000 |
Debt securities HTM: |  |  |  |
Amortized Cost |  | 142,059,000 | 150,369,000 |
Gross Unrealized Gains |  | 0 | 0 |
Gross Unrealized Losses |  | (12,629,000) | (6,663,000) |
Fair Value |  | 129,430,000 | 143,706,000 |
Corporate securities |  |  |  |
Debt securities AFS: |  |  |  |
Amortized Cost |  | 23,254,000 | 23,302,000 |
Gross Unrealized Gains |  | 0 | 0 |
Gross Unrealized Losses |  | (2,560,000) | (3,868,000) |
Fair Value |  | 20,694,000 | 19,434,000 |
Municipal securities |  |  |  |
Debt securities AFS: |  |  |  |
Amortized Cost |  | 191,138,000 | 314,554,000 |
Gross Unrealized Gains |  | 28,000 | 5,698,000 |
Gross Unrealized Losses |  | (15,615,000) | (11,779,000) |
Fair Value |  | $ 175,551,000 | 308,473,000 |
Non-US Government and Agency Securities | Credit concentration risk | Stockholders' equity |  |  |  |
Debt securities HTM: |  |  |  |
Maximum exposure to any single issuer | 10.00% | 10.00% |  |
Asset-backed securities |  |  |  |
Debt securities AFS: |  |  |  |
Amortized Cost |  | $ 103,081,000 | 150,992,000 |
Gross Unrealized Gains |  | 157,000 | 0 |
Gross Unrealized Losses |  | (14,000) | (1,322,000) |
Fair Value |  | 103,224,000 | 149,670,000 |
U.S. Treasury securities |  |  |  |
Debt securities AFS: |  |  |  |
Amortized Cost |  | 0 | 103,691,000 |
Gross Unrealized Gains |  | 0 | 21,000 |
Gross Unrealized Losses |  | 0 | (35,000) |
Fair Value |  | 0 | 103,677,000 |
Agency securities |  |  |  |
Debt securities AFS: |  |  |  |
Amortized Cost |  | 4,000,000 | 4,000,000 |
Gross Unrealized Gains |  | 0 | 0 |
Gross Unrealized Losses |  | (43,000) | (100,000) |
Fair Value |  | 3,957,000 | 3,900,000 |
Commercial |  |  |  |
Debt securities AFS: |  |  |  |
Amortized Cost |  | 466,929,000 | 445,207,000 |
Gross Unrealized Gains |  | 0 | 113,000 |
Gross Unrealized Losses |  | (56,078,000) | (53,432,000) |
Fair Value |  | 410,851,000 | 391,888,000 |
Debt securities HTM: |  |  |  |
Amortized Cost |  | 110,326,000 | 113,543,000 |
Gross Unrealized Gains |  | 0 | 0 |
Gross Unrealized Losses |  | (8,632,000) | (6,731,000) |
Fair Value |  | $ 101,694,000 | $ 106,812,000 |

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