Commitments and Contingent Liabilities - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Percentage Of Commercial And industrial Loans to Total Loans
Cash Deposit FDIC Insurance Limit	$ 250,000		$ 250,000
Uninsured deposits at financial institutions	487,100		487,100		$ 4,000
Commitments for loans	422,500		422,500		390,000
Reserve for unfunded loan commitments	255,000		255,000		$ 185,000
Rent and equipment expense	$ 615,000	$ 412,000	$ 1,200	$ 801,000