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Securities - Amortized Cost and Fair Value (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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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 | $ 73,507 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after One Through Five Years, Amortized Cost | 509 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost | 74,016 |
Amortized Cost | 87,808 | $ 92,876
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Fair Value | 73,507 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after One Through Five Years, Fair Value |  | 509
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value | 74,016 |
Debt Securities, Available-for-sale | 88,179 | 93,383
Mortgage - backed securities - residential [Member] |  |
Amortized cost and fair values of securities |  |
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost | 10,116 |
Amortized Cost | 10,116 | 11,969
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value | 10,478 |
Debt Securities, Available-for-sale | 10,478 | 12,472
Collateralized mortgage obligations - residential [Member] |  |
Amortized cost and fair values of securities |  |
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost | 3,676 |
Amortized Cost | 3,676 | 4,481
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value | 3,685 |
Debt Securities, Available-for-sale | 3,685 | 4,486
Collateral Pledged [Member] |  |
Amortized cost and fair values of securities |  |
Debt Securities, Available-for-sale, Restricted | $ 2,700 | $ 3,700

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