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Securities - Amortized Cost and Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
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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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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