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Securities - Amortized Cost and Fair Value (Details) - USD ($) $ in Thousands	Jun. 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	$ 73,027
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Fair Value	73,027
Amortized cost and fair values of securities
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	74,030
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	74,037
Available-for-sale Securities, Amortized Cost Basis	1,003
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after One Through Five Years, Fair Value	1,010
Mortgage - backed securities - residential [Member]
Amortized cost and fair values of securities
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost	9,312
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value	9,706
Collateralized mortgage obligations - residential [Member]
Amortized cost and fair values of securities
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost	3,342
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value	$ 3,337
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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