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Securities - Amortized Cost and Fair Value (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Amortized Cost	$ 52,996
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Fair Value	52,996
Amortized cost and fair values of securities
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	53,502
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	53,509
Available-for-sale Securities, Amortized Cost Basis	506
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after One Through Five Years, Fair Value	513
Mortgage - backed securities - residential [Member]
Amortized cost and fair values of securities
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost	8,402
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value	8,780
Collateralized mortgage obligations - residential [Member]
Amortized cost and fair values of securities
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost	3,156
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value	$ 3,151
Common Class B [Member] | Equity mutual fund [Member]
Debt Securities, Available-for-sale [Line Items]
Equity Securities, FV-NI, Restricted		$ 0
Amortized cost and fair values of securities
Total Fair value		3,427
Gross Unrealized Gains		3,427
Gross Unrealized Losses		$ 0

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