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Investment Securities - Amortized Cost and Fair Value, by Contractual Maturity (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Amortized Cost |  |
Due in one year or less | $ 33,320 |
Due after one year through five years | 9,275 |
Due after five years through ten years | 132,017 |
Due after ten years | 89,258 |
Total contractual maturities | 263,870 |
Available-for-sale investment securities, amortized cost | 2,290,781 | $ 2,558,675
Fair Value |  |
Due in one year or less | 33,045 |
Due after one year through five years | 9,281 |
Due after five years through ten years | 132,281 |
Due after ten years | 89,450 |
Total contractual maturities | 264,057 |
Total available-for-sale securities, Fair value, | 2,055,959 | 2,255,336
Amortized Cost |  |
Due after five years through ten years | 22,233 |
Due after ten years | 82,682 |
Total contractual maturities | 104,915 |
Amortized cost | 3,853,697 | 4,041,449
Fair Value |  |
Due after five years through ten years | 21,019 |
Due after ten years | 76,725 |
Total contractual maturities | 97,744 |
Total held to maturity, Fair value, | 3,475,143 | 3,574,856
Mortgage-backed securities: |  |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,152,446 |
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,018,035 |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,285,253 |
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,166,358 |
Residential - Government agency |  |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 10,356 |
Available-for-sale investment securities, amortized cost | 10,356 | 11,303
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 9,367 |
Total available-for-sale securities, Fair value, | 9,367 | 10,182
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 41,584 |
Amortized cost | 41,584 | 43,885
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 36,932 |
Total held to maturity, Fair value, | 36,932 | 38,696
Residential - Government-sponsored enterprises |  |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 807,631 |
Available-for-sale investment securities, amortized cost | 807,631 | 895,421
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 723,591 |
Total available-for-sale securities, Fair value, | 723,591 | 783,297
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 94,039 |
Amortized cost | 94,039 | 99,379
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 84,270 |
Total held to maturity, Fair value, | 84,270 | 88,366
Commercial - Government agency |  |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 260,845 |
Available-for-sale investment securities, amortized cost | 260,845 | 268,944
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 216,010 |
Total available-for-sale securities, Fair value, | 216,010 | 218,674
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 30,960 |
Amortized cost | 30,960 | 30,795
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 23,956 |
Total held to maturity, Fair value, | 23,956 | 23,778
Commercial - Government-sponsored enterprises |  |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 73,614 |
Available-for-sale investment securities, amortized cost | 73,614 | 93,459
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 69,067 |
Total available-for-sale securities, Fair value, | 69,067 | 86,431
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,118,670 |
Amortized cost | 1,118,670 | 1,129,738
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,021,200 |
Total held to maturity, Fair value, | 1,021,200 | 999,176
Collateralized mortgage obligations |  |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 874,465 |
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 773,867 |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 2,463,529 |
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 2,211,041 |
Government agency |  |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 487,889 |
Available-for-sale investment securities, amortized cost | 487,889 | 538,718
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 434,141 |
Total available-for-sale securities, Fair value, | 434,141 | 471,150
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 928,546 |
Amortized cost | 928,546 | 989,130
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 833,690 |
Total held to maturity, Fair value, | 833,690 | 879,659
Government-sponsored enterprises |  |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 386,576 |
Available-for-sale investment securities, amortized cost | 386,576 | 425,826
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 339,726 |
Total available-for-sale securities, Fair value, | 339,726 | 363,970
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,534,983 |
Amortized cost | 1,534,983 | 1,642,274
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,377,351 |
Total held to maturity, Fair value, | $ 1,377,351 | $ 1,448,377

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