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Investment Securities - Additional information (Details) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Dec. 31, 2018 USD ($)
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax | $ 19,000 | $ 0 | $ 25,000 | $ (31,000) |
Investment Securities: |  |  |  |  |
Consolidated investment securities portfolio modified, years |  |  | 35 months 3 days |  | 44 months 3 days
Proceeds from sales of investment securities - available for sale | 2,800,000 |  | $ 3,374,000 | 4,479,000 |
Book value of securities available for sale and held to maturity | 126,815,000 |  | 126,815,000 |  | $ 115,536,000
Gross investment gains | $ 88,000 |  | $ 118,000 | 15,000 |
Gross investment losses |  |  |  | 163,000 |
Available-for-sale, Securities and Held To Maturity Securities in Unrealized Loss Positions | 51 |  | 51 |  |
Debt and Equity Securities, Gain (Loss) | $ 88,000 | $ 0 | $ 118,000 | $ (148,000) |
Standard & Poor's, AAA Rating [Member] |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Portfolio rated | 55.60% |  | 55.60% |  | 57.50%
Securities rated below A [Member] |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Portfolio rated | 9.10% |  | 9.10% |  | 10.00%
Deferred Compensation, Share-based Payments [Member] | Assets Held With Rabbi Trust [Member] |  |  |  |  |
Investment Securities: |  |  |  |  |
Equity Securities, FV-NI | $ 354,000 |  | $ 354,000 |  |
Debt and Equity Securities, Gain (Loss) | 9,000 |  | 9,000 |  |
Unrealized Gain on Securities | $ 3,000 |  | $ 3,000 |  |
Minimum |  |  |  |  |
Investment Securities: |  |  |  |  |
Consolidated investment securities portfolio modified, years |  |  | 24 months |  |
Maximum |  |  |  |  |
Investment Securities: |  |  |  |  |
Consolidated investment securities portfolio modified, years |  |  | 60 months |  |

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