Supplementary Income Statement Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Other Income and Expenses [Abstract]
Other service charges, commissions, and fees - interchange fees, net	$ 14,142	$ 13,814	$ 11,995
Other operating expenses - dues and subscriptions (includes software subscriptions)	4,764	4,250	3,431
Other operating expenses - data processing expense	3,157	3,130	3,234
Other operating expenses - telephone and data line expense	2,893	3,057	3,024
Other operating expenses - marketing	$ 1,960	$ 2,727	$ 3,065