Condensed Parent Company Only Financial Statements - Income Statement (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Condensed Financial Statements, Captions [Line Items]
Interest expense	$ 14,706	$ 21,251	$ 14,068
Income before income taxes	41,628	44,581	37,697
Benefit from income taxes	10,172	10,381	8,816
Net income	31,456	34,200	28,881
Parent
Condensed Financial Statements, Captions [Line Items]
Equity in undistributed net income of subsidiaries	30,309	29,329	25,635
Dividends distributed by subsidiaries	3,100	5,700	4,100
Total income	33,409	35,029	29,735
Interest expense	2,502	925	925
Other operating expenses	215	226	216
Total operating expenses	2,717	1,151	1,141
Income before income taxes	30,692	33,878	28,594
Benefit from income taxes	(764)	(322)	(287)
Net income	$ 31,456	$ 34,200	$ 28,881