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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 | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Amortized Cost |  |
Due in one year or less | $ 2,062 | $ 1,349
Due after one through five years | 4,781 | 5,545
Due after five through ten years | 92,598 | 70,777
Due after ten years | 1,218,472 | 1,097,451
Total debt securities with a single maturity date | 1,317,913 | 1,175,122
Total investment securities | 2,343,573 | 1,807,389
Fair Value |  |
Due in one year or less | 2,071 | 1,353
Due after one through five years | 4,960 | 5,764
Due after five through ten years | 96,882 | 75,223
Due after ten years | 1,278,792 | 1,182,110
Total debt securities with a single maturity date | 1,382,705 | 1,264,450
Total investment securities | 2,405,568 | 1,919,119
Amortized Cost |  |
Due in one year or less | 9,056 | 9,712
Due after one through five years | 23,116 | 22,241
Due after five through ten years | 151,103 | 115,408
Due after ten years | 503,454 | 505,153
Total debt securities with a single maturity date | 686,729 | 652,514
Total investment securities | 1,295,534 | 1,227,668
Fair Value |  |
Due in one year or less | 9,068 | 9,755
Due after one through five years | 24,084 | 23,190
Due after five through ten years | 154,819 | 121,333
Due after ten years | 516,971 | 533,079
Total debt securities with a single maturity date | 704,942 | 687,357
Investment securities held to maturity | 1,318,780 | 1,280,293
U.S. Government-sponsored mortgage-backed securities |  |
Amortized Cost |  |
Without single maturity date | 1,025,660 | 632,267
Total investment securities | 1,025,660 | 632,267
Fair Value |  |
Without single maturity date | 1,022,863 | 654,669
Total investment securities | 1,022,863 | 654,669
Amortized Cost |  |
Without single maturity date | 608,805 | 575,154
Total investment securities | 608,805 | 575,154
Fair Value |  |
Without single maturity date | 613,838 | 592,936
Investment securities held to maturity | $ 613,838 | $ 592,936

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