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Securities - Amortized Cost and Estimated Fair Value of Securities - Securities Held-to-maturity (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Jan. 01, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Securities held-to-maturity: |  |  |
Amortized Cost | $ 322,732 |  | $ 366,560
Gross Unrealized Gains | 9,721 |  | 2,519
Gross Unrealized (Losses) | (1) |  | (972)
Allowance for credit losses on debt securities | 55 | $ 58 |
Estimated Fair Value | 332,452 |  | 368,107
Agency mortgage-backed securities |  |  |
Securities held-to-maturity: |  |  |
Amortized Cost | 249,070 |  | 285,344
Gross Unrealized Gains | 7,895 |  | 1,206
Gross Unrealized (Losses) | (1) |  | (968)
Estimated Fair Value | 256,964 |  | 285,582
Municipals - exempt from Federal tax |  |  |
Securities held-to-maturity: |  |  |
Amortized Cost | 73,662 |  | 81,216
Gross Unrealized Gains | 1,826 |  | 1,313
Gross Unrealized (Losses) |  |  | (4)
Allowance for credit losses on debt securities | (55) |  |
Estimated Fair Value | $ 75,488 |  | $ 82,525

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