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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, 2021 | Dec. 31, 2020
--- | --- | ---
Amortized Cost |  |
Due in one year or less | $ 1,060 | $ 1,349
Due after one through five years | 8,850 | 5,545
Due after five through ten years | 90,059 | 70,777
Due after ten years | 1,281,775 | 1,097,451
Total debt securities with a single maturity date | 1,381,744 | 1,175,122
Total investment securities | 2,334,464 | 1,807,389
Fair Value |  |
Due in one year or less | 1,067 | 1,353
Due after one through five years | 9,176 | 5,764
Due after five through ten years | 95,333 | 75,223
Due after ten years | 1,363,038 | 1,182,110
Total debt securities with a single maturity date | 1,468,614 | 1,264,450
Total investment securities | 2,426,900 | 1,919,119
Amortized Cost |  |
Due in one year or less | 8,405 | 9,712
Due after one through five years | 23,079 | 22,241
Due after five through ten years | 147,663 | 115,408
Due after ten years | 746,456 | 505,153
Total debt securities with a single maturity date | 925,603 | 652,514
Amortized Cost | 1,721,659 | 1,227,668
Fair Value |  |
Due in one year or less | 8,461 | 9,755
Due after one through five years | 24,351 | 23,190
Due after five through ten years | 152,770 | 121,333
Due after ten years | 769,606 | 533,079
Total debt securities with a single maturity date | 955,188 | 687,357
Investment securities held to maturity | 1,760,847 | 1,280,293
U.S. Government-sponsored mortgage-backed securities |  |
Amortized Cost |  |
Without single maturity date | 952,720 | 632,267
Fair Value |  |
Without single maturity date | 958,286 | 654,669
Total investment securities | 958,286 | 654,669
Amortized Cost |  |
Without single maturity date | 796,056 | 575,154
Amortized Cost | 796,056 | 575,154
Fair Value |  |
Without single maturity date | 805,659 | 592,936
Investment securities held to maturity | $ 805,659 | $ 592,936

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