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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 | Jun. 30, 2022 | Dec. 31, 2021
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Amortized Cost |  |
Due in one year or less | $ 6,707 | $ 6,954
Due after one through five years | 28,721 | 5,097
Due after five through ten years | 164,626 | 120,460
Due after ten years | 1,630,162 | 1,464,460
Total debt securities with a single maturity date | 1,830,216 | 1,596,971
Total investment securities | 2,542,432 | 2,268,655
Fair Value |  |
Due in one year or less | 6,664 | 6,965
Due after one through five years | 28,420 | 5,309
Due after five through ten years | 159,497 | 126,816
Due after ten years | 1,465,311 | 1,537,856
Total debt securities with a single maturity date | 1,659,892 | 1,676,946
Total investment securities | 2,296,351 | 2,344,551
Amortized Cost |  |
Due in one year or less | 5,591 | 6,971
Due after one through five years | 41,180 | 30,272
Due after five through ten years | 174,108 | 177,203
Due after ten years | 1,291,478 | 1,215,812
Total debt securities with a single maturity date | 1,512,357 | 1,430,258
Amortized Cost | 2,333,924 | 2,180,047
Fair Value |  |
Due in one year or less | 5,604 | 6,995
Due after one through five years | 41,092 | 31,946
Due after five through ten years | 163,070 | 180,129
Due after ten years | 1,073,029 | 1,231,568
Total debt securities with a single maturity date | 1,282,795 | 1,450,638
Investment securities held to maturity | 2,025,524 | 2,202,503
U.S. Government-sponsored mortgage-backed securities |  |
Amortized Cost |  |
Without single maturity date | 712,216 | 671,684
Fair Value |  |
Without single maturity date | 636,459 | 667,605
Total investment securities | 636,459 | 667,605
Amortized Cost |  |
Without single maturity date | 821,567 | 749,789
Amortized Cost | 821,567 | 749,789
Fair Value |  |
Without single maturity date | 742,729 | 751,865
Investment securities held to maturity | $ 742,729 | $ 751,865

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