Investment in Affordable Housing Projects - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Schedule Of Equity Method Investments [Line Items]
Year in which investments are expected to be paid			2021
Tax credits and other benefits recognized			$ 414,000	$ 378,000
Losses from investments in affordable housing projects	$ 47,000	$ 62,000	191,000	$ 206,000
Other Assets [Member]
Schedule Of Equity Method Investments [Line Items]
Investments in affordable housing projects	4,300,000		4,300,000		$ 4,500,000
Other Liabilities [Member]
Schedule Of Equity Method Investments [Line Items]
Capital call for investments in affordable housing projects	$ 749,000		$ 749,000		$ 1,200,000