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Securities - Amortized Cost and Fair Value (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Amortized cost and fair values of securities |  |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Amortized Cost | $ 48,767 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost | 404 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost | 49,171 |
Amortized Cost | 59,884 | $ 87,808
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Fair Value | 48,768 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after One Through Five Years, Fair Value | 411 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value | 49,179 |
Debt Securities, Available-for-sale | 60,193 | 88,179
Mortgage - backed securities - residential [Member] |  |
Amortized cost and fair values of securities |  |
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost | 7,727 |
Amortized Cost | 7,727 | 10,116
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value | 8,037 |
Debt Securities, Available-for-sale | 8,037 | 10,478
Collateralized mortgage obligations - residential [Member] |  |
Amortized cost and fair values of securities |  |
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost | 2,986 |
Amortized Cost | 2,986 | 3,676
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value | 2,977 |
Debt Securities, Available-for-sale | 2,977 | 3,685
Collateral Pledged [Member] |  |
Amortized cost and fair values of securities |  |
Debt Securities, Available-for-sale, Restricted | $ 2,000 | $ 2,700

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