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Investment Securities - Amortized Cost and Fair Value, by Contractual Maturity (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Amortized Cost |  |
Due in one year or less | $ 33,287 |
Due after one year through five years | 9,275 |
Due after five years through ten years | 102,374 |
Due after ten years | 127,751 |
Total contractual maturities | 272,687 |
Available-for-sale investment securities, amortized cost | 2,379,004 | $ 2,558,675
Fair Value |  |
Due in one year or less | 32,636 |
Due after one year through five years | 9,293 |
Due after five years through ten years | 102,643 |
Due after ten years | 128,093 |
Total contractual maturities | 272,665 |
Total available-for-sale securities, Fair value, | 2,067,956 | 2,255,336
Amortized Cost |  |
Due after five years through ten years | 22,182 |
Due after ten years | 82,797 |
Total contractual maturities | 104,979 |
Amortized cost | 3,917,175 | 4,041,449
Fair Value |  |
Due after five years through ten years | 19,901 |
Due after ten years | 73,423 |
Total contractual maturities | 93,324 |
Total held to maturity, Fair value, | 3,401,006 | 3,574,856
Mortgage-backed securities: |  |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,200,992 |
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,021,200 |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,289,534 |
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,122,259 |
Residential - Government agency |  |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 10,765 |
Available-for-sale investment securities, amortized cost | 10,765 | 11,303
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 9,335 |
Total available-for-sale securities, Fair value, | 9,335 | 10,182
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 42,233 |
Amortized cost | 42,233 | 43,885
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 35,703 |
Total held to maturity, Fair value, | 35,703 | 38,696
Residential - Government-sponsored enterprises |  |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 838,352 |
Available-for-sale investment securities, amortized cost | 838,352 | 895,421
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 721,145 |
Total available-for-sale securities, Fair value, | 721,145 | 783,297
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 96,074 |
Amortized cost | 96,074 | 99,379
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 82,282 |
Total held to maturity, Fair value, | 82,282 | 88,366
Commercial - Government agency |  |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 262,848 |
Available-for-sale investment securities, amortized cost | 262,848 | 268,944
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 208,228 |
Total available-for-sale securities, Fair value, | 208,228 | 218,674
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 30,907 |
Amortized cost | 30,907 | 30,795
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 22,723 |
Total held to maturity, Fair value, | 22,723 | 23,778
Commercial - Government-sponsored enterprises |  |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 89,027 |
Available-for-sale investment securities, amortized cost | 89,027 | 93,459
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 82,492 |
Total available-for-sale securities, Fair value, | 82,492 | 86,431
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,120,320 |
Amortized cost | 1,120,320 | 1,129,738
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 981,551 |
Total held to maturity, Fair value, | 981,551 | 999,176
Collateralized mortgage obligations |  |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 905,325 |
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 774,091 |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 2,522,662 |
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 2,185,423 |
Government agency |  |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 505,180 |
Available-for-sale investment securities, amortized cost | 505,180 | 538,718
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 434,856 |
Total available-for-sale securities, Fair value, | 434,856 | 471,150
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 949,738 |
Amortized cost | 949,738 | 989,130
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 825,744 |
Total held to maturity, Fair value, | 825,744 | 879,659
Government-sponsored enterprises |  |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 400,145 |
Available-for-sale investment securities, amortized cost | 400,145 | 425,826
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 339,235 |
Total available-for-sale securities, Fair value, | 339,235 | 363,970
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,572,924 |
Amortized cost | 1,572,924 | 1,642,274
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,359,679 |
Total held to maturity, Fair value, | $ 1,359,679 | $ 1,448,377

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