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Investment Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Available for sale debt securities |  |
Amortized Cost | $ 2,178,092 | $ 2,190,448
Unrealized Gains | 3,978 | 406
Unrealized Losses | (195,353) | (264,338)
Total available-for-sale securities | 1,986,717 | 1,926,516
Held to maturity securities |  |
Amortized Cost | 3,594,188 | 3,790,650
Unrealized Gains | 225 | 201
Unrealized Losses | (384,530) | (528,342)
Total held-to-maturity securities | 3,209,883 | 3,262,509
Available-for-sale investment securities |  |
Accrued interest receivable related to available-for-sale investment securities | 5,000 | 5,600
Accrued interest receivable related to held to maturity investment securities | 6,600 | 6,600
Collateralized loan obligations |  |
Available for sale debt securities |  |
Amortized Cost | 97,788 | 173,152
Unrealized Gains | 153 | 323
Total available-for-sale securities | 97,941 | 173,475
Government agency debt securities |  |
Available for sale debt securities |  |
Amortized Cost |  | 8,170
Unrealized Losses |  | (23)
Total available-for-sale securities |  | 8,147
Held to maturity securities |  |
Amortized Cost | 47,514 | 49,267
Unrealized Losses | (3,557) | (5,398)
Total held-to-maturity securities | 43,957 | 43,869
Residential - Government agency |  |
Available for sale debt securities |  |
Amortized Cost | 32,641 | 37,473
Unrealized Gains | 279 |
Unrealized Losses | (1,086) | (1,614)
Total available-for-sale securities | 31,834 | 35,859
Held to maturity securities |  |
Amortized Cost | 37,979 | 40,888
Unrealized Losses | (4,802) | (6,579)
Total held-to-maturity securities | 33,177 | 34,309
Residential - Government-sponsored enterprises |  |
Available for sale debt securities |  |
Amortized Cost | 840,130 | 840,836
Unrealized Gains | 1,564 |
Unrealized Losses | (66,253) | (102,723)
Total available-for-sale securities | 775,441 | 738,113
Held to maturity securities |  |
Amortized Cost | 88,255 | 92,573
Unrealized Losses | (11,393) | (14,854)
Total held-to-maturity securities | 76,862 | 77,719
Commercial - Government agency |  |
Available for sale debt securities |  |
Amortized Cost | 239,479 | 249,348
Unrealized Losses | (48,312) | (53,223)
Total available-for-sale securities | 191,167 | 196,125
Held to maturity securities |  |
Amortized Cost | 30,817 | 31,009
Unrealized Losses | (7,910) | (8,666)
Total held-to-maturity securities | 22,907 | 22,343
Commercial - Government-sponsored enterprises |  |
Available for sale debt securities |  |
Amortized Cost | 43,761 | 48,015
Unrealized Losses | (1,548) | (3,107)
Total available-for-sale securities | 42,213 | 44,908
Held to maturity securities |  |
Amortized Cost | 1,094,959 | 1,114,549
Unrealized Gains | 225 | 201
Unrealized Losses | (110,402) | (149,244)
Total held-to-maturity securities | 984,782 | 965,506
Commercial - Non-agency |  |
Available for sale debt securities |  |
Amortized Cost | 120,793 | 22,000
Unrealized Gains | 641 | 83
Unrealized Losses | (24) |
Total available-for-sale securities | 121,410 | 22,083
Government agency |  |
Available for sale debt securities |  |
Amortized Cost | 475,946 | 452,038
Unrealized Gains | 800 |
Unrealized Losses | (40,455) | (54,914)
Total available-for-sale securities | 436,291 | 397,124
Held to maturity securities |  |
Amortized Cost | 842,658 | 907,565
Unrealized Losses | (92,792) | (126,020)
Total held-to-maturity securities | 749,866 | 781,545
Government-sponsored enterprises |  |
Available for sale debt securities |  |
Amortized Cost | 327,554 | 359,416
Unrealized Gains | 541 |
Unrealized Losses | (37,675) | (48,734)
Total available-for-sale securities | 290,420 | 310,682
Held to maturity securities |  |
Amortized Cost | 1,397,112 | 1,500,212
Unrealized Losses | (149,497) | (210,721)
Total held-to-maturity securities | 1,247,615 | 1,289,491
Debt securities issued by states and political subdivisions |  |
Held to maturity securities |  |
Amortized Cost | 54,894 | 54,587
Unrealized Losses | (4,177) | (6,860)
Total held-to-maturity securities | $ 50,717 | $ 47,727

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