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Disclosures about Fair Value Measurements and Financial Instruments - Additional Information (Details) - USD ($) | 9 Months Ended |
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Sep. 30, 2019 | Dec. 31, 2018
Disclosures about Fair Value Measurements and Financial Instruments |  |
Carrying value of impaired loans | $ 829,000 | $ 11,000
Specific valuation allowance | 96,000 | 11,000
Net fair value of impaired loans | $ 733,000 | $ 0
Assets and Liabilities Considered Financial Instruments, Percentage | 90.00% |

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