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Investment Securities - Schedule of Contractual Maturities of Investment Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Available-for-sale securities |  |
Due in one year or less, amortized cost | $ 47,978 | $ 89,578
Due in one to five years, amortized cost | 143,352 | 157,883
Due in five to ten years, amortized cost | 80,561 | 89,125
Due after ten years, amortized cost | 27,481 | 24,674
Amortized Cost | 6,635,481 | 4,725,539
Due in one year or less, fair value | 47,915 | 89,392
Due in one to five years, fair value | 141,123 | 153,325
Due in five to ten years, fair value | 79,672 | 84,240
Due after ten years, fair value | 25,257 | 21,650
Fair Value | 6,236,263 | 4,141,482
Held-to-maturity securities |  |
Held-to-maturity securities, due in one year or less, amortized cost | 47,030 | 18,929
Held-to-maturity securities, due in one to five years, amortized cost | 76,452 | 110,897
Held-to-maturity securities, due in five to ten years, amortized cost | 67,195 | 71,846
Held-to-maturity securities, due after ten years, amortized cost | 302,153 | 329,734
Amortized Cost | 3,344,165 | 3,613,720
Less: Allowance for credit losses | (260) | (457)
Held-to-maturity securities, net of allowance for credit losses | 3,343,905 | 3,613,263
Held-to-maturity securities, due in one year or less, fair value | 46,630 | 18,658
Held-to-maturity securities, due in one to five years, fair value | 76,366 | 108,056
Held-to-maturity securities, due in five to ten years, fair value | 63,882 | 70,277
Held-to-maturity securities, due after ten years, fair value | 246,728 | 258,379
Fair Value | 2,785,147 | 2,910,550
Mortgage-backed |  |
Available-for-sale securities |  |
Mortgage-backed, without single maturity date, amortized cost | 6,336,109 | 4,364,279
Mortgage-backed, without single maturity date, fair value | 5,942,296 | 3,792,875
Held-to-maturity securities |  |
Mortgage-backed, amortized cost | 2,851,335 | 3,082,314
Mortgage-backed, fair value | $ 2,351,541 | $ 2,455,180

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