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Investment Securities - Additional information (Details)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020 USD ($) position	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) position	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Investment Securities:
Consolidated investment securities portfolio modified, years			23 months		36 months 27 days
Proceeds from sales of investment securities - available for sale	$ 0		$ 0	$ 530,000
Book value of securities available for sale and held to maturity	$ 115,585,000		$ 115,585,000		$ 117,076,000
Gross investment gains		$ 30,000		30,000
Available-for-sale, Securities and Held To Maturity Securities in Unrealized Loss Positions | position	34		34
Debt and Equity Securities, Gain (Loss)	$ 0	30,000	$ 0	30,000
Standard & Poor's, AAA Rating [Member]
INVESTMENT SECURITIES
Portfolio rated	48.20%		48.20%		53.40%
Securities rated below A [Member]
INVESTMENT SECURITIES
Portfolio rated	13.80%		13.80%		9.10%
Deferred Compensation, Share-based Payments [Member] | Assets Held With Rabbi Trust [Member]
Investment Securities:
Equity Securities, FV-NI	$ 391,000		$ 391,000		$ 366,000
Debt and Equity Securities, Gain (Loss)		$ 0		$ 0
Equity securities, realized loss	(21,000)		(15,000)
Equity securities, unrealized gain	$ 9,000		$ 3,000
Maximum
Investment Securities:
Consolidated investment securities portfolio modified, years			60 months

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