Quarterly Results of Operations (Unaudited) - Summary of Quarterly Consolidated Results of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Interest income	$ 53,234	$ 50,146	$ 50,344	$ 51,654	$ 53,398	$ 55,711	$ 53,850	$ 45,373	$ 205,378	$ 208,332	$ 166,168
Interest expense	9,612	6,749	7,348	10,729	11,879	12,248	12,321	11,093	34,438	47,541	31,599
Net interest income	43,622	43,397	42,996	40,925	41,519	43,463	41,529	34,280	170,940	160,791	134,569
Credit loss expense	3,042	2,052	7,057	8,600	340	376	896	364	20,751	1,976	2,906
Gain (loss) on sale of securities	2,622	1,088	248	339	10	0	(100)	15	4,297	(75)	(443)
Net Income	$ 21,893	$ 20,312	$ 14,639	$ 11,655	$ 18,543	$ 20,537	$ 16,642	$ 10,816	$ 68,499	$ 66,538	$ 53,117
Earnings per share:
Basic (in USD per share)	$ 0.50	$ 0.46	$ 0.33	$ 0.26	$ 0.41	$ 0.46	$ 0.37	$ 0.28	$ 1.56	$ 1.53	$ 1.39
Diluted (in USD per share)	$ 0.50	$ 0.46	$ 0.33	$ 0.26	$ 0.41	$ 0.46	$ 0.37	$ 0.28	$ 1.55	$ 1.53	$ 1.38
Average shares outstanding:
Basic (in shares)	43,862,435	43,862,435	43,781,249	44,658,512	44,971,676	45,038,021	45,055,117	38,822,543	44,044,737	43,493,316	38,347,059
Diluted (in shares)	43,903,881	43,903,881	43,802,794	44,756,716	45,103,065	45,113,730	45,130,408	38,906,172	44,123,076	43,597,595	38,495,231