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Investment Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Available for sale debt securities |  |
Amortized Cost | $ 2,190,448 | $ 2,558,675
Unrealized Gains | 406 | 43
Unrealized Losses | (264,338) | (303,382)
Total available-for-sale securities, Fair value, | 1,926,516 | 2,255,336
Held to maturity securities |  |
Amortized Cost | 3,790,650 | 4,041,449
Unrealized Gains | 201 | 195
Unrealized Losses | (528,342) | (466,788)
Total held to maturity, Fair value, | 3,262,509 | 3,574,856
Available-for-sale investment securities |  |
Accrued interest receivable related to available-for-sale investment securities | $ 5,600 | 7,200
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] | Interest Receivable |
Accrued interest receivable related to held to maturity investment securities | $ 6,600 | 7,000
Debt Securities, Held-to-Maturity, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] | Interest Receivable |
Collateralized loan obligations |  |
Available for sale debt securities |  |
Amortized Cost | $ 173,152 | 249,871
Unrealized Gains | 323 | 43
Unrealized Losses |  | (2,060)
Total available-for-sale securities, Fair value, | 173,475 | 247,854
U.S. Treasury and government agency debt securities |  |
Available for sale debt securities |  |
Amortized Cost | 8,170 | 33,169
Unrealized Losses | (23) | (666)
Total available-for-sale securities, Fair value, | 8,147 | 32,503
Government-sponsored enterprises debt securities |  |
Available for sale debt securities |  |
Amortized Cost |  | 20,000
Unrealized Losses |  | (408)
Total available-for-sale securities, Fair value, |  | 19,592
Government agency debt securities |  |
Held to maturity securities |  |
Amortized Cost | 49,267 | 52,051
Unrealized Losses | (5,398) | (4,497)
Total held to maturity, Fair value, | 43,869 | 47,554
Residential - Government agency |  |
Available for sale debt securities |  |
Amortized Cost | 37,473 | 11,303
Unrealized Losses | (1,614) | (1,121)
Total available-for-sale securities, Fair value, | 35,859 | 10,182
Held to maturity securities |  |
Amortized Cost | 40,888 | 43,885
Unrealized Losses | (6,579) | (5,189)
Total held to maturity, Fair value, | 34,309 | 38,696
Residential - Government-sponsored enterprises |  |
Available for sale debt securities |  |
Amortized Cost | 840,836 | 895,421
Unrealized Losses | (102,723) | (112,124)
Total available-for-sale securities, Fair value, | 738,113 | 783,297
Held to maturity securities |  |
Amortized Cost | 92,573 | 99,379
Unrealized Losses | (14,854) | (11,013)
Total held to maturity, Fair value, | 77,719 | 88,366
Commercial - Government agency |  |
Available for sale debt securities |  |
Amortized Cost | 249,348 | 268,944
Unrealized Losses | (53,223) | (50,270)
Total available-for-sale securities, Fair value, | 196,125 | 218,674
Held to maturity securities |  |
Amortized Cost | 31,009 | 30,795
Unrealized Losses | (8,666) | (7,017)
Total held to maturity, Fair value, | 22,343 | 23,778
Commercial - Government-sponsored enterprises |  |
Available for sale debt securities |  |
Amortized Cost | 48,015 | 93,459
Unrealized Losses | (3,107) | (7,028)
Total available-for-sale securities, Fair value, | 44,908 | 86,431
Held to maturity securities |  |
Amortized Cost | 1,114,549 | 1,129,738
Unrealized Gains | 201 | 195
Unrealized Losses | (149,244) | (130,757)
Total held to maturity, Fair value, | 965,506 | 999,176
Commercial - Non-agency |  |
Available for sale debt securities |  |
Amortized Cost | 22,000 | 21,964
Unrealized Gains | 83 |
Unrealized Losses |  | (281)
Total available-for-sale securities, Fair value, | 22,083 | 21,683
Government agency |  |
Available for sale debt securities |  |
Amortized Cost | 452,038 | 538,718
Unrealized Losses | (54,914) | (67,568)
Total available-for-sale securities, Fair value, | 397,124 | 471,150
Held to maturity securities |  |
Amortized Cost | 907,565 | 989,130
Unrealized Losses | (126,020) | (109,471)
Total held to maturity, Fair value, | 781,545 | 879,659
Government-sponsored enterprises |  |
Available for sale debt securities |  |
Amortized Cost | 359,416 | 425,826
Unrealized Losses | (48,734) | (61,856)
Total available-for-sale securities, Fair value, | 310,682 | 363,970
Held to maturity securities |  |
Amortized Cost | 1,500,212 | 1,642,274
Unrealized Losses | (210,721) | (193,897)
Total held to maturity, Fair value, | 1,289,491 | 1,448,377
Debt securities issued by states and political subdivisions |  |
Held to maturity securities |  |
Amortized Cost | 54,587 | 54,197
Unrealized Losses | (6,860) | (4,947)
Total held to maturity, Fair value, | $ 47,727 | $ 49,250

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