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Investment Securities - Additional information (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	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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