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Securities - Amortized Cost and Fair Value (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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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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