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Commitments and Contingencies - Summary of outstanding loan commitments, unused lines of credit and letters of credit (Details) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016
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Loan Origination Commitments |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Fair value disclosure, off-balance sheet risks, face amount, liability | $ 3,077,000 | $ 3,066,000
Unused lines of Credit |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Fair value disclosure, off-balance sheet risks, face amount, liability | 19,109 | 22,099
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 | 7,997,000 | 2,991,000
Line Of Credit Commercial |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Fair value disclosure, off-balance sheet risks, face amount, liability | 9,364,000 | 18,474,000
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 | 1,748,000 | 634,000
Letter Of Credit |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Fair value disclosure, off-balance sheet risks, face amount, liability | $ 71,000 | $ 48,000

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