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, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract]
Interest income	$ 54,118	$ 50,868	$ 47,420	$ 47,589	$ 53,234	$ 50,146	$ 50,344	$ 51,654	$ 199,995	$ 205,378	$ 208,332
Interest expense	4,142	4,324	4,788	5,051	9,612	6,749	7,348	10,729	18,305	34,438	47,541
Net interest income	49,976	46,544	42,632	42,538	43,622	43,397	42,996	40,925	181,690	170,940	160,791
Credit loss expense (recovery)	(2,071)	1,112	(1,492)	367	3,042	2,052	7,057	8,600
Gain (loss) on sale of securities	0	0	0	914	2,622	1,088	248	339	914	4,297	(75)
Net Income	$ 21,425	$ 23,071	$ 22,173	$ 20,422	$ 21,893	$ 20,312	$ 14,639	$ 11,655	$ 87,091	$ 68,499	$ 66,538
Earnings per share:
Basic (in USD per share)	$ 0.49	$ 0.53	$ 0.50	$ 0.46	$ 0.50	$ 0.46	$ 0.33	$ 0.26	$ 1.99	$ 1.56	$ 1.53
Diluted (in USD per share)	$ 0.49	$ 0.52	$ 0.50	$ 0.46	$ 0.50	$ 0.46	$ 0.33	$ 0.26	$ 1.98	$ 1.55	$ 1.53
Average shares outstanding:
Basic (in shares)	43,534,298	43,810,729	43,950,501	43,919,549	43,862,435	43,862,435	43,781,249	44,658,512	43,802,733	44,044,737	43,493,316
Diluted (in shares)	43,733,416	43,958,870	44,111,103	44,072,581	43,903,881	43,903,881	43,802,794	44,756,716	43,955,280	44,123,076	43,597,595