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Investment Securities - Additional information (Details) | 3 Months Ended | 9 Months Ended | 12 Months Ended
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Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Dec. 31, 2019 USD ($)
INVESTMENT SECURITIES |  |  |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax |  | $ 19,000 |  | $ 25,000 |
Investment Securities: |  |  |  |  |
Premium percentage on mortgage backed securities purchased |  |  | 101.40% |  |
Consolidated investment securities portfolio modified, years |  |  | 20 months 9 days |  | 36 months 27 days
Proceeds from sales of investment securities — available for sale | $ 0 | 2,800,000 | $ 0 | 3,374,000 |
Gross investment gains |  | 88,000 |  | 118,000 |
Book value of securities available for sale and held to maturity | $ 113,126,000 |  | $ 113,126,000 |  | $ 117,076,000
Number of positions | 35 |  | 35 |  |
Available-for-sale Securities, Equity Securities | $ 424,000 |  | $ 424,000 |  | $ 366,000
Debt and Equity Securities, Gain (Loss) |  | $ 88,000 |  | $ 118,000 |
Standard & Poor's, AAA Rating [Member] |  |  |  |  |
INVESTMENT SECURITIES |  |  |  |  |
Portfolio rated | 43.50% |  | 43.50% |  | 53.40%
Securities rated below A [Member] |  |  |  |  |
INVESTMENT SECURITIES |  |  |  |  |
Portfolio rated | 14.80% |  | 14.80% |  | 9.10%
Deferred Compensation, Share-based Payments [Member] | Assets Held With Rabbi Trust [Member] |  |  |  |  |
Investment Securities: |  |  |  |  |
Available-for-sale Securities, Equity Securities | $ 424,000 |  | $ 424,000 |  | $ 366,000
Maximum |  |  |  |  |
Investment Securities: |  |  |  |  |
Consolidated investment securities portfolio modified, years |  |  | 60 months |  |

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