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Commitments and Contingencies - Summary of outstanding loan commitments, unused lines of credit and letters of credit (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Fair value disclosure, off-balance sheet risks, face amount, liability | $ 19,905 | $ 19,109
Other Mortgage Loans |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Fair value disclosure, off-balance sheet risks, face amount, liability | 3,589 | 3,077
Line Of Credit Home Equity |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Fair value disclosure, off-balance sheet risks, face amount, liability | 9,118 | 7,997
Line Of Credit Commercial |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Fair value disclosure, off-balance sheet risks, face amount, liability | 10,061 | 9,364
Line Of Credit Consumer Unsecured |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Fair value disclosure, off-balance sheet risks, face amount, liability | 726 | 1,748
Letter Of Credit |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Fair value disclosure, off-balance sheet risks, face amount, liability | $ 1,059 | $ 71

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