Noninterest Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Noninterest Expense
Salaries and employee benefits	$ 11,967	$ 10,467	$ 38,470	$ 31,935
Occupancy and equipment	2,283	1,550	5,821	4,634
Professional fees	1,352	789	3,942	2,360
Amortization of intangible assets	965	554	2,787	1,661
Software subscriptions	641	601	2,276	1,746
Insurance expense	591	479	1,625	1,354
Supplemental retirement plan cost	585	310	1,344	930
Data processing	463	454	2,218	1,865
Other	2,321	2,705	9,471	7,787
Total noninterest expense, excluding merger-related costs	21,168	17,909	67,954	54,272
Salaries and employee benefits merger-related costs			356
Other merger-related costs	17	661	2,144	1,201
Total merger-related costs	$ 17	$ 661	$ 2,500	$ 1,201