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Securities - Amortized Cost and Fair Value of Debt Securities by Contractual Maturity - Securities Held-to-maturity (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Held-to-maturity, Amortized Cost |  |
Due 3 months or less | $ 530 |
Due after 3 months through one year | 914 |
Due after one year through five years | 7,283 |
Due after five years through ten years | 33,354 |
Due after ten years | 31,581 |
Agency mortgage-backed securities | 249,070 |
Total | 322,732 |
Held-to-maturity, Estimated Fair Value |  |
Due 3 months or less | 531 |
Due after 3 months through one year | 917 |
Due after one year through five years | 7,537 |
Due after five years through ten years | 34,201 |
Due after ten years | 32,302 |
Agency mortgage-backed securities | 256,964 |
Total | $ 332,452 | $ 368,107

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