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Investment Securities (Contractual Maturities of Investment Securities) (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Available-for-sale securities |  |
Due in one year or less, amortized cost | $ 119,830 | $ 49,714
Due in one to five years, amortized cost | 63,644 | 72,382
Due in five to ten years, amortized cost | 115,734 | 118,358
Due after ten years, amortized cost | 64,590 | 69,200
Amortized Cost | 3,769,634 | 2,316,369
Due in one year or less, fair value | 119,275 | 49,822
Due in one to five years, fair value | 61,701 | 73,850
Due in five to ten years, fair value | 105,076 | 117,573
Due after ten years, fair value | 57,478 | 72,560
Fair Value | 3,243,017 | 2,327,793
Held-to-maturity securities |  |
Held-to-maturity securities, due in one year or less, amortized cost | 1,340 | 2,976
Held-to-maturity securities, due in one to five years, amortized cost | 94,705 | 79,422
Held-to-maturity securities, due in five to ten years, amortized cost | 115,318 | 106,713
Held-to-maturity securities, due after ten years, amortized cost | 365,510 | 222,522
Amortized Cost | 3,641,055 | 2,942,363
Less: Allowance for credit losses | (488) | (78)
Held-to-maturity securities, net of allowance for credit losses | 3,640,567 | 2,942,285
Held-to-maturity securities, due in one year or less, fair value | 1,332 | 2,992
Held-to-maturity securities, due in one to five years, fair value | 89,093 | 79,705
Held-to-maturity securities, due in five to ten years, fair value | 113,758 | 112,667
Held-to-maturity securities, due after ten years, fair value | 288,460 | 221,358
Fair Value | 2,949,821 | 2,900,694
Mortgage-backed |  |
Available-for-sale securities |  |
Mortgage-backed, without single maturity date, amortized cost | 3,405,836 | 2,006,715
Mortgage-backed, without single maturity date, fair value | 2,899,487 | 2,013,988
Held-to-maturity securities |  |
Mortgage-backed, amortized cost | 3,064,182 | 2,530,730
Mortgage-backed, fair value | $ 2,457,178 | $ 2,483,972

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