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Investment Securities - Schedule of Contractual Maturities of Investment Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024 | Mar. 31, 2024
--- | --- | --- | ---
Available-for-sale securities |  |  |
Due in one year or less, amortized cost | $ 61,653 | $ 89,578 | $ 107,680
Due in one to five years, amortized cost | 160,377 | 157,883 | 130,137
Due in five to ten years, amortized cost | 89,444 | 89,125 | 85,212
Due after ten years, amortized cost | 27,136 | 24,674 | 17,904
Amortized Cost | 4,729,234 | 4,725,539 | 4,942,360
Due in one year or less, fair value | 61,702 | 89,392 | 107,285
Due in one to five years, fair value | 156,869 | 153,325 | 121,417
Due in five to ten years, fair value | 85,935 | 84,240 | 80,234
Due after ten years, fair value | 24,016 | 21,650 | 15,269
Fair Value | 4,220,305 | 4,141,482 | 4,387,598
Held-to-maturity securities |  |  |
Held-to-maturity securities, due in one year or less, amortized cost | 27,766 | 18,929 | 4,652
Held-to-maturity securities, due in one to five years, amortized cost | 103,583 | 110,897 | 115,707
Held-to-maturity securities, due in five to ten years, amortized cost | 94,324 | 71,846 | 89,538
Held-to-maturity securities, due after ten years, amortized cost | 302,854 | 329,734 | 352,428
Amortized Cost | 3,564,936 | 3,613,720 | 3,810,344
Less: Allowance for credit losses | (446) | (457) | (329)
Held-to-maturity securities, net of allowance for credit losses | 3,564,490 | 3,613,263 | 3,810,015
Held-to-maturity securities, due in one year or less, fair value | 27,436 | 18,658 | 4,616
Held-to-maturity securities, due in one to five years, fair value | 101,546 | 108,056 | 111,324
Held-to-maturity securities, due in five to ten years, fair value | 88,875 | 70,277 | 88,050
Held-to-maturity securities, due after ten years, fair value | 242,029 | 258,379 | 280,536
Fair Value | 2,922,813 | 2,910,550 | 3,111,954
Mortgage-backed |  |  |
Available-for-sale securities |  |  |
Mortgage-backed, without single maturity date, amortized cost | 4,390,624 | 4,364,279 | 4,601,427
Mortgage-backed, without single maturity date, fair value | 3,891,783 | 3,792,875 | 4,063,393
Held-to-maturity securities |  |  |
Mortgage-backed, amortized cost | 3,036,409 | 3,082,314 | 3,248,019
Mortgage-backed, fair value | $ 2,462,927 | $ 2,455,180 | $ 2,627,428

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