Investment in Affordable Housing Projects - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Schedule Of Equity Method Investments [Line Items]
Year in which investments are expected to be paid	2023
Tax credits and other benefits recognized	$ 479,000	$ 552,000	$ 504,000
Losses from investments in affordable housing projects	409,000	236,000	$ 266,000
Other Assets [Member]
Schedule Of Equity Method Investments [Line Items]
Investments in affordable housing projects	3,800,000	4,200,000
Other Liabilities [Member]
Schedule Of Equity Method Investments [Line Items]
Capital call for investments in affordable housing projects	$ 397,000	$ 749,000