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Investment Securities - Additional information (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021 USD ($) position	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) position	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Investment Securities:
Proceeds from sales of investment securities - available for sale	$ 0	$ 0	$ 960,000	$ 0
Gross investment gains			84,000
Book value of securities available for sale and held to maturity	$ 119,809,000		$ 119,809,000		$ 111,694,000
Number of positions | position	73		73
Premium percentage on mortgage backed securities purchased			101.10%
Consolidated investment securities portfolio modified, years			37 months 3 days		25 months 12 days
Standard & Poor's, AAA Rating [Member]
INVESTMENT SECURITIES
Portfolio rated	47.60%		47.60%		42.20%
Securities rated below A [Member]
INVESTMENT SECURITIES
Portfolio rated	15.00%		15.00%		15.20%
Maximum
Investment Securities:
Consolidated investment securities portfolio modified, years			60 months

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