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Securities - Amortized Cost and Estimated Fair Value of Securities - Securities Held-to-maturity (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Securities held-to-maturity: |  |  |
Amortized Cost | $ 297,443 |  | $ 366,560
Gross Unrealized Gains | 7,714 |  | 2,519
Gross Unrealized (Losses) | (230) |  | (972)
Allowance for credit losses | (54) | $ (58) |
Estimated Fair Value | 304,927 |  | 368,107
Agency mortgage-backed securities |  |  |
Securities held-to-maturity: |  |  |
Amortized Cost | 228,652 |  | 285,344
Gross Unrealized Gains | 6,075 |  | 1,206
Gross Unrealized (Losses) | (230) |  | (968)
Estimated Fair Value | 234,497 |  | 285,582
Municipals - exempt from Federal tax |  |  |
Securities held-to-maturity: |  |  |
Amortized Cost | 68,791 |  | 81,216
Gross Unrealized Gains | 1,639 |  | 1,313
Gross Unrealized (Losses) |  |  | (4)
Allowance for credit losses | (54) |  |
Estimated Fair Value | $ 70,430 |  | $ 82,525

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