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Investment Securities - Amortized Cost and Fair Value, by Contractual Maturity (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Amortized Cost |  |
Due after one year through five years | $ 78,662 |
Due after five years through ten years | 93,938 |
Due after ten years | 45,981 |
Total contractual maturities | 218,581 |
Available-for-sale investment securities, amortized cost | 2,178,092 | $ 2,190,448
Fair Value |  |
Due after one year through five years | 79,248 |
Due after five years through ten years | 94,091 |
Due after ten years | 46,012 |
Total contractual maturities | 219,351 |
Total available-for-sale securities | 1,986,717 | 1,926,516
Amortized Cost |  |
Due after five years through ten years | 51,958 |
Due after ten years | 50,450 |
Total contractual maturities | 102,408 |
Amortized cost | 3,594,188 | 3,790,650
Fair Value |  |
Due after five years through ten years | 48,993 |
Due after ten years | 45,681 |
Total contractual maturities | 94,674 |
Total held-to-maturity securities | 3,209,883 | 3,262,509
Mortgage-backed securities: |  |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,156,011 |
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,040,655 |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,252,010 |
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,117,728 |
Residential - Government agency |  |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 32,641 |
Available-for-sale investment securities, amortized cost | 32,641 | 37,473
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 31,834 |
Total available-for-sale securities | 31,834 | 35,859
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 37,979 |
Amortized cost | 37,979 | 40,888
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 33,177 |
Total held-to-maturity securities | 33,177 | 34,309
Residential - Government-sponsored enterprises |  |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 840,130 |
Available-for-sale investment securities, amortized cost | 840,130 | 840,836
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 775,441 |
Total available-for-sale securities | 775,441 | 738,113
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 88,255 |
Amortized cost | 88,255 | 92,573
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 76,862 |
Total held-to-maturity securities | 76,862 | 77,719
Commercial - Government agency |  |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 239,479 |
Available-for-sale investment securities, amortized cost | 239,479 | 249,348
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 191,167 |
Total available-for-sale securities | 191,167 | 196,125
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 30,817 |
Amortized cost | 30,817 | 31,009
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 22,907 |
Total held-to-maturity securities | 22,907 | 22,343
Commercial - Government-sponsored enterprises |  |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 43,761 |
Available-for-sale investment securities, amortized cost | 43,761 | 48,015
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 42,213 |
Total available-for-sale securities | 42,213 | 44,908
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,094,959 |
Amortized cost | 1,094,959 | 1,114,549
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 984,782 |
Total held-to-maturity securities | 984,782 | 965,506
Collateralized mortgage obligations |  |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 803,500 |
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 726,711 |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 2,239,770 |
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,997,481 |
Government agency |  |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 475,946 |
Available-for-sale investment securities, amortized cost | 475,946 | 452,038
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 436,291 |
Total available-for-sale securities | 436,291 | 397,124
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 842,658 |
Amortized cost | 842,658 | 907,565
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 749,866 |
Total held-to-maturity securities | 749,866 | 781,545
Government-sponsored enterprises |  |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 327,554 |
Available-for-sale investment securities, amortized cost | 327,554 | 359,416
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 290,420 |
Total available-for-sale securities | 290,420 | 310,682
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,397,112 |
Amortized cost | 1,397,112 | 1,500,212
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,247,615 |
Total held-to-maturity securities | $ 1,247,615 | $ 1,289,491

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