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Investment Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Available for sale debt securities |  |
Amortized Cost | $ 2,379,004 | $ 2,558,675
Unrealized Gains | 628 | 43
Unrealized Losses | (311,676) | (303,382)
Total available-for-sale securities, Fair value, | 2,067,956 | 2,255,336
Held to maturity securities |  |
Amortized Cost | 3,917,175 | 4,041,449
Unrealized Gains | 180 | 195
Unrealized Losses | (516,349) | (466,788)
Total held to maturity, Fair value, | 3,401,006 | 3,574,856
Available-for-sale investment securities |  |
Accrued interest receivable related to available-for-sale investment securities | 6,400 | 7,200
Accrued interest receivable related to held to maturity investment securities | 6,700 | 7,000
Collateralized Loan Obligations |  |
Available for sale debt securities |  |
Amortized Cost | 217,400 | 249,871
Unrealized Gains | 628 | 43
Unrealized Losses |  | (2,060)
Total available-for-sale securities, Fair value, | 218,028 | 247,854
U.S. Treasury and government agency debt securities |  |
Available for sale debt securities |  |
Amortized Cost | 13,287 | 33,169
Unrealized Losses | (318) | (666)
Total available-for-sale securities, Fair value, | 12,969 | 32,503
Government-sponsored enterprises debt securities |  |
Available for sale debt securities |  |
Amortized Cost | 20,000 | 20,000
Unrealized Losses | (332) | (408)
Total available-for-sale securities, Fair value, | 19,668 | 19,592
Government agency debt securities |  |
Held to maturity securities |  |
Amortized Cost | 50,589 | 52,051
Unrealized Losses | (5,284) | (4,497)
Total held to maturity, Fair value, | 45,305 | 47,554
Residential - Government agency |  |
Available for sale debt securities |  |
Amortized Cost | 10,765 | 11,303
Unrealized Losses | (1,430) | (1,121)
Total available-for-sale securities, Fair value, | 9,335 | 10,182
Held to maturity securities |  |
Amortized Cost | 42,233 | 43,885
Unrealized Losses | (6,530) | (5,189)
Total held to maturity, Fair value, | 35,703 | 38,696
Residential - Government-sponsored enterprises |  |
Available for sale debt securities |  |
Amortized Cost | 838,352 | 895,421
Unrealized Losses | (117,207) | (112,124)
Total available-for-sale securities, Fair value, | 721,145 | 783,297
Held to maturity securities |  |
Amortized Cost | 96,074 | 99,379
Unrealized Losses | (13,792) | (11,013)
Total held to maturity, Fair value, | 82,282 | 88,366
Commercial - Government agency |  |
Available for sale debt securities |  |
Amortized Cost | 262,848 | 268,944
Unrealized Losses | (54,620) | (50,270)
Total available-for-sale securities, Fair value, | 208,228 | 218,674
Held to maturity securities |  |
Amortized Cost | 30,907 | 30,795
Unrealized Losses | (8,184) | (7,017)
Total held to maturity, Fair value, | 22,723 | 23,778
Commercial - Government-sponsored enterprises |  |
Available for sale debt securities |  |
Amortized Cost | 89,027 | 93,459
Unrealized Losses | (6,535) | (7,028)
Total available-for-sale securities, Fair value, | 82,492 | 86,431
Held to maturity securities |  |
Amortized Cost | 1,120,320 | 1,129,738
Unrealized Gains | 180 | 195
Unrealized Losses | (138,949) | (130,757)
Total held to maturity, Fair value, | 981,551 | 999,176
Commercial - Non-agency |  |
Available for sale debt securities |  |
Amortized Cost | 22,000 | 21,964
Unrealized Losses |  | (281)
Total available-for-sale securities, Fair value, | 22,000 | 21,683
Government agency |  |
Available for sale debt securities |  |
Amortized Cost | 505,180 | 538,718
Unrealized Losses | (70,324) | (67,568)
Total available-for-sale securities, Fair value, | 434,856 | 471,150
Held to maturity securities |  |
Amortized Cost | 949,738 | 989,130
Unrealized Losses | (123,994) | (109,471)
Total held to maturity, Fair value, | 825,744 | 879,659
Government-sponsored enterprises |  |
Available for sale debt securities |  |
Amortized Cost | 400,145 | 425,826
Unrealized Losses | (60,910) | (61,856)
Total available-for-sale securities, Fair value, | 339,235 | 363,970
Held to maturity securities |  |
Amortized Cost | 1,572,924 | 1,642,274
Unrealized Losses | (213,245) | (193,897)
Total held to maturity, Fair value, | 1,359,679 | 1,448,377
Debt securities issued by states and political subdivisions |  |
Held to maturity securities |  |
Amortized Cost | 54,390 | 54,197
Unrealized Losses | (6,371) | (4,947)
Total held to maturity, Fair value, | $ 48,019 | $ 49,250

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