Investment in Affordable Housing Projects - Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 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			$ 276,000	$ 252,000
Losses from investments in affordable housing projects	$ 60,000	$ 63,000	143,000	$ 143,000
Other Assets [Member]
Schedule Of Equity Method Investments [Line Items]
Investments in affordable housing projects	4,400,000		4,400,000		$ 4,500,000
Other Liabilities [Member]
Schedule Of Equity Method Investments [Line Items]
Capital call for investments in affordable housing projects	$ 1,000,000		$ 1,000,000		$ 1,200,000