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Securities - Amortized Cost and Fair Value of Debt Securities by Contractual Maturity - Securities Held-to-maturity (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Held-to-maturity, Amortized Cost |  |
Due after 3 months through one year | $ 493 |
Due after one year through five years | 10,390 |
Due after five years through ten years | 31,509 |
Due after ten years | 26,399 |
Agency mortgage-backed securities | 228,652 |
Total | 297,443 |
Held-to-maturity, Estimated Fair Value |  |
Due after 3 months through one year | 499 |
Due after one year through five years | 10,757 |
Due after five years through ten years | 32,149 |
Due after ten years | 27,025 |
Agency mortgage-backed securities | 234,497 |
Total | $ 304,927 | $ 368,107

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