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Investment Securities - Schedule of Contractual Maturities of Investment Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022
--- | --- | --- | ---
Available-for-sale securities |  |  |
Due in one year or less, amortized cost | $ 99,892 | $ 119,830 | $ 55,249
Due in one to five years, amortized cost | 139,623 | 63,644 | 86,555
Due in five to ten years, amortized cost | 43,199 | 115,734 | 115,949
Due after ten years, amortized cost | 64,419 | 64,590 | 68,853
Amortized Cost | 4,315,723 | 3,769,634 | 3,478,306
Due in one year or less, fair value | 99,525 | 119,275 | 54,846
Due in one to five years, fair value | 130,036 | 61,701 | 83,641
Due in five to ten years, fair value | 38,074 | 105,076 | 105,921
Due after ten years, fair value | 54,855 | 57,478 | 60,639
Fair Value | 3,611,835 | 3,243,017 | 2,923,653
Held-to-maturity securities |  |  |
Held-to-maturity securities, due in one year or less, amortized cost | 2,248 | 1,340 | 1,173
Held-to-maturity securities, due in one to five years, amortized cost | 103,104 | 94,705 | 85,423
Held-to-maturity securities, due in five to ten years, amortized cost | 106,042 | 115,318 | 108,703
Held-to-maturity securities, due after ten years, amortized cost | 362,183 | 365,510 | 348,026
Amortized Cost | 3,909,531 | 3,641,055 | 3,390,152
Less: Allowance for credit losses | (381) | (488) | (310)
Held-to-maturity securities, net of allowance for credit losses | 3,909,150 | 3,640,567 | 3,389,842
Held-to-maturity securities, due in one year or less, fair value | 2,241 | 1,332 | 1,166
Held-to-maturity securities, due in one to five years, fair value | 96,546 | 89,093 | 78,995
Held-to-maturity securities, due in five to ten years, fair value | 100,215 | 113,758 | 104,829
Held-to-maturity securities, due after ten years, fair value | 270,722 | 288,460 | 272,319
Fair Value | 3,057,959 | 2,949,821 | 2,679,326
Mortgage-backed |  |  |
Available-for-sale securities |  |  |
Mortgage-backed, without single maturity date, amortized cost | 3,968,590 | 3,405,836 | 3,151,700
Mortgage-backed, without single maturity date, fair value | 3,289,345 | 2,899,487 | 2,618,606
Held-to-maturity securities |  |  |
Mortgage-backed, amortized cost | 3,335,954 | 3,064,182 | 2,846,827
Mortgage-backed, fair value | $ 2,588,235 | $ 2,457,178 | $ 2,222,017

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