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Securities - Amortized Cost and Fair Value of Securities Available for Sale and Held for Investment (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
AFS Debt Securities |  |
Available for sale, amortized cost, total | $ 3,332,322 | $ 2,434,389
Available for sale, gross unrealized gains | 34,891 | 3,492
Available for sale, gross unrealized losses | (155,133) | (211,338)
Available for sale, fair value | 3,212,080 | 2,226,543
HTM Debt Securities |  |
Held to maturity, amortized cost, total | 598,604 | 635,186
Held to maturity, gross unrealized gains | 0 | 0
Held to maturity, gross unrealized losses | (100,220) | (127,592)
Held to maturity, fair value | 498,384 | 507,594
U.S. Treasury securities and obligations of U.S. government agencies |  |
AFS Debt Securities |  |
Available for sale, amortized cost, total | 41,205 | 28,233
Available for sale, gross unrealized gains | 346 | 29
Available for sale, gross unrealized losses | (432) | (522)
Available for sale, fair value | 41,119 | 27,740
Residential mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities |  |
AFS Debt Securities |  |
Available for sale, amortized cost, total | 2,654,711 | 1,777,274
Available for sale, gross unrealized gains | 28,944 | 1,237
Available for sale, gross unrealized losses | (141,197) | (190,536)
Available for sale, fair value | 2,542,458 | 1,587,975
HTM Debt Securities |  |
Held to maturity, amortized cost, total | 511,031 | 546,444
Held to maturity, gross unrealized gains | 0 | 0
Held to maturity, gross unrealized losses | (93,719) | (117,620)
Held to maturity, fair value | 417,312 | 428,824
Commercial mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities |  |
AFS Debt Securities |  |
Available for sale, amortized cost, total | 299,739 | 206,537
Available for sale, gross unrealized gains | 4,478 | 1,195
Available for sale, gross unrealized losses | (6,471) | (10,283)
Available for sale, fair value | 297,746 | 197,449
HTM Debt Securities |  |
Held to maturity, amortized cost, total | 87,573 | 88,742
Held to maturity, gross unrealized gains | 0 | 0
Held to maturity, gross unrealized losses | (6,501) | (9,972)
Held to maturity, fair value | 81,072 | 78,770
Private mortgage-backed securities and collateralized mortgage obligations |  |
AFS Debt Securities |  |
Available for sale, amortized cost, total | 103,825 | 129,475
Available for sale, gross unrealized gains | 348 | 149
Available for sale, gross unrealized losses | (5,582) | (8,382)
Available for sale, fair value | 98,591 | 121,242
CLOs |  |
AFS Debt Securities |  |
Available for sale, amortized cost, total | 216,818 | 278,342
Available for sale, gross unrealized gains | 698 | 788
Available for sale, gross unrealized losses | (309) | (166)
Available for sale, fair value | 217,207 | 278,964
Obligations of state and political subdivisions |  |
AFS Debt Securities |  |
Available for sale, amortized cost, total | 8,635 | 7,139
Available for sale, gross unrealized gains | 1 | 0
Available for sale, gross unrealized losses | (1,142) | (1,449)
Available for sale, fair value | 7,494 | 5,690
Other debt securities |  |
AFS Debt Securities |  |
Available for sale, amortized cost, total | 7,389 | 7,389
Available for sale, gross unrealized gains | 76 | 94
Available for sale, gross unrealized losses | 0 | 0
Available for sale, fair value | $ 7,465 | $ 7,483

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