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Investment Securities - Additional information (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2021 USD ($) position	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)
Investment Securities:
Premium percentage on mortgage backed securities purchased	101.10%
Consolidated investment securities portfolio modified, years	39 months 12 days		25 months 12 days
Proceeds from sales of investment securities — available for sale	$ 0	$ 0
Book value of securities available for sale and held to maturity	$ 123,462,000		$ 111,694,000
Number of positions | position	76
Available-for-sale Securities, Equity Securities	$ 474,000		$ 443,000
Standard & Poor's, AAA Rating [Member]
INVESTMENT SECURITIES
Portfolio rated	47.10%		42.20%
Securities rated below A [Member]
INVESTMENT SECURITIES
Portfolio rated	13.80%		15.20%
Deferred Compensation, Share-based Payments [Member] | Assets Held With Rabbi Trust [Member]
Investment Securities:
Available-for-sale Securities, Equity Securities	$ 474,000		$ 443,000
Maximum
Investment Securities:
Consolidated investment securities portfolio modified, years	60 months

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Investment securities.

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