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Investment Securities - Amortized Cost and Fair Value of Available for Sale Securities and Held to Maturity Securities by Contractual Maturity (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Amortized Cost |  |
Due in one year or less | $ 2,822 | $ 6,954
Due after one through five years | 11,694 | 5,097
Due after five through ten years | 169,729 | 120,460
Due after ten years | 1,480,472 | 1,464,460
Total debt securities with a single maturity date | 1,664,717 | 1,596,971
Amortized Cost | 2,273,347 | 2,268,655
Fair Value |  |
Due in one year or less | 2,809 | 6,965
Due after one through five years | 11,265 | 5,309
Due after five through ten years | 161,211 | 126,816
Due after ten years | 1,293,103 | 1,537,856
Total debt securities with a single maturity date | 1,468,388 | 1,676,946
Total Investment Securities | 1,976,661 | 2,344,551
Amortized Cost |  |
Due in one year or less | 13,697 | 6,971
Due after one through five years | 80,697 | 30,272
Due after five through ten years | 147,078 | 177,203
Due after ten years | 1,269,826 | 1,215,812
Total debt securities with a single maturity date | 1,511,298 | 1,430,258
Amortized Cost | 2,287,372 | 2,180,047
Fair Value |  |
Due in one year or less | 13,749 | 6,995
Due after one through five years | 76,453 | 31,946
Due after five through ten years | 135,027 | 180,129
Due after ten years | 1,020,477 | 1,231,568
Total debt securities with a single maturity date | 1,245,706 | 1,450,638
Total Investment Securities | 1,907,865 | 2,202,503
U.S. Government-sponsored mortgage-backed securities |  |
Amortized Cost |  |
Without single maturity date | 608,630 | 671,684
Amortized Cost | 608,630 | 671,684
Fair Value |  |
Without single maturity date | 508,273 | 667,605
Total Investment Securities | 508,273 | 667,605
Amortized Cost |  |
Without single maturity date | 776,074 | 749,789
Amortized Cost | 776,074 | 749,789
Fair Value |  |
Without single maturity date | 662,159 | 751,865
Total Investment Securities | $ 662,159 | $ 751,865

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