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Investment Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Available for sale debt securities |  |
Amortized Cost | $ 2,290,781 | $ 2,558,675
Unrealized Gains | 465 | 43
Unrealized Losses | (235,287) | (303,382)
Total available-for-sale securities, Fair value, | 2,055,959 | 2,255,336
Held to maturity securities |  |
Amortized Cost | 3,853,697 | 4,041,449
Unrealized Gains | 210 | 195
Unrealized Losses | (378,764) | (466,788)
Total held to maturity, Fair value, | 3,475,143 | 3,574,856
Available-for-sale investment securities |  |
Accrued interest receivable related to available-for-sale investment securities | 6,200 | 7,200
Accrued interest receivable related to held to maturity investment securities | 7,000 |
Collateralized loan obligations |  |
Available for sale debt securities |  |
Amortized Cost | 208,550 | 249,871
Unrealized Gains | 396 | 43
Unrealized Losses | (2) | (2,060)
Total available-for-sale securities, Fair value, | 208,944 | 247,854
U.S. Treasury and government agency debt securities |  |
Available for sale debt securities |  |
Amortized Cost | 13,320 | 33,169
Unrealized Losses | (123) | (666)
Total available-for-sale securities, Fair value, | 13,197 | 32,503
Government-sponsored enterprises debt securities |  |
Available for sale debt securities |  |
Amortized Cost | 20,000 | 20,000
Unrealized Losses | (153) | (408)
Total available-for-sale securities, Fair value, | 19,847 | 19,592
Government agency debt securities |  |
Held to maturity securities |  |
Amortized Cost | 50,424 | 52,051
Unrealized Losses | (3,421) | (4,497)
Total held to maturity, Fair value, | 47,003 | 47,554
Residential - Government agency |  |
Available for sale debt securities |  |
Amortized Cost | 10,356 | 11,303
Unrealized Losses | (989) | (1,121)
Total available-for-sale securities, Fair value, | 9,367 | 10,182
Held to maturity securities |  |
Amortized Cost | 41,584 | 43,885
Unrealized Losses | (4,652) | (5,189)
Total held to maturity, Fair value, | 36,932 | 38,696
Residential - Government-sponsored enterprises |  |
Available for sale debt securities |  |
Amortized Cost | 807,631 | 895,421
Unrealized Losses | (84,040) | (112,124)
Total available-for-sale securities, Fair value, | 723,591 | 783,297
Held to maturity securities |  |
Amortized Cost | 94,039 | 99,379
Unrealized Losses | (9,769) | (11,013)
Total held to maturity, Fair value, | 84,270 | 88,366
Commercial - Government agency |  |
Available for sale debt securities |  |
Amortized Cost | 260,845 | 268,944
Unrealized Losses | (44,835) | (50,270)
Total available-for-sale securities, Fair value, | 216,010 | 218,674
Held to maturity securities |  |
Amortized Cost | 30,960 | 30,795
Unrealized Losses | (7,004) | (7,017)
Total held to maturity, Fair value, | 23,956 | 23,778
Commercial - Government-sponsored enterprises |  |
Available for sale debt securities |  |
Amortized Cost | 73,614 | 93,459
Unrealized Losses | (4,547) | (7,028)
Total available-for-sale securities, Fair value, | 69,067 | 86,431
Held to maturity securities |  |
Amortized Cost | 1,118,670 | 1,129,738
Unrealized Gains | 210 | 195
Unrealized Losses | (97,680) | (130,757)
Total held to maturity, Fair value, | 1,021,200 | 999,176
Commercial - Non-agency |  |
Available for sale debt securities |  |
Amortized Cost | 22,000 | 21,964
Unrealized Gains | 69 |
Unrealized Losses |  | (281)
Total available-for-sale securities, Fair value, | 22,069 | 21,683
Government agency |  |
Available for sale debt securities |  |
Amortized Cost | 487,889 | 538,718
Unrealized Losses | (53,748) | (67,568)
Total available-for-sale securities, Fair value, | 434,141 | 471,150
Held to maturity securities |  |
Amortized Cost | 928,546 | 989,130
Unrealized Losses | (94,856) | (109,471)
Total held to maturity, Fair value, | 833,690 | 879,659
Government-sponsored enterprises |  |
Available for sale debt securities |  |
Amortized Cost | 386,576 | 425,826
Unrealized Losses | (46,850) | (61,856)
Total available-for-sale securities, Fair value, | 339,726 | 363,970
Held to maturity securities |  |
Amortized Cost | 1,534,983 | 1,642,274
Unrealized Losses | (157,632) | (193,897)
Total held to maturity, Fair value, | 1,377,351 | 1,448,377
Debt securities issued by states and political subdivisions |  |
Held to maturity securities |  |
Amortized Cost | 54,491 | 54,197
Unrealized Losses | (3,750) | (4,947)
Total held to maturity, Fair value, | $ 50,741 | $ 49,250

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