Commitments and Contingent Liabilities - Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Percentage Of Commercial And industrial Loans to Total Loans
Cash Deposit FDIC Insurance Limit	$ 250,000
Uninsured deposits at financial institutions	4,600,000		$ 4,000,000
Commitments for loans	343,000,000		390,000,000
Reserve for unfunded loan commitments	185,000		$ 185,000
Rent and equipment expense	$ 622,000	$ 389,000