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Investment Securities (Amortized Cost and Estimated Fair Value by Maturity Date) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Investment Securities [Abstract] |  |
Available for sale, Amortized Cost, Due in one year or less | $ 4,999 |
Available for sale, Amortized Cost, Due after one year through five years | 1,393 |
Available for sale, Amortized Cost, Due after five years through ten years | 57,061 |
Available for sale, Amortized Cost, Due after ten years | 74,012 |
Available-for-sale securities, Amortized Cost | 137,465 | $ 122,492
Available for sale, Estimated Fair Value, Due in one year or less | 5,015 |
Available for sale, Estimated Fair Value, Due after one year through five years | 1,431 |
Available for sale, Estimated Fair Value, Due after five years through ten years | 58,419 |
Available for sale, Estimated Fair Value, Due after ten years | 74,703 |
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value | 139,568 |
Available-for-sale Securities, Debt Securities, Total | 139,568 | 122,791
Held to maturity securities, Amortized Cost, Due after one year through five years | 2,944 |
Held to maturity securities, Amortized Cost, Due after five years through ten years | 27,728 |
Held to maturity securities, Amortized Cost, Due after ten years | 35,034 |
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Amortized Cost | 65,706 |
Held-to-maturity Securities, Amortized Cost | 65,706 | 8,786
Held to maturity securities, Estimated Fair Value, Due after one year through five years | 2,957 |
Held to maturity securities, Estimated Fair Value, Due after five years through ten years | 27,818 |
Held to maturity securities, Estimated Fair Value, Due after ten years | 35,053 |
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Fair Value | 65,828 |
Held-to-maturity Securities, Fair Value, Total | $ 65,828 | $ 8,654

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