Summarized Quarterly Financial Information (Details) - USD ($) $ / shares in Units, shares in Thousands, $ 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	$ 42,473	$ 41,558	$ 40,499	$ 40,937	$ 42,499	$ 43,231	$ 44,312	$ 48,217	$ 165,467	$ 178,259	$ 197,700
Taxable equivalent adjustment	325	334	343	331	333	301	217	188
Interest income (FTE)	42,798	41,892	40,842	41,268	42,832	43,532	44,529	48,405
Interest expense	1,842	2,070	2,585	3,397	4,318	5,254	6,242	7,801	9,894	23,615	36,339
Net Interest Income	40,956	39,822	38,257	37,871	38,514	38,278	38,287	40,604
(Recovery of) provision for credit losses	0	(725)	(2,000)	(440)	474	1,026	1,250	7,972	(3,165)	10,722	(1,250)
Noninterest income	17,616	17,947	17,448	16,630	17,721	16,985	14,631	33,343	69,641	82,680	68,490
Noninterest expense	28,624	29,178	29,574	29,809	28,641	28,712	28,468	29,469	117,185	115,290	117,614
Income Loss From Continuing Operations Before Tax Equivalent Adjustment Income Taxes Extraordinary Items Noncontrolling Interest	29,948	29,316	28,131	25,132	27,120	25,525	23,200	36,506
Income tax expense	6,237	6,250	5,640	4,987	4,565	5,098	4,732	7,322	23,114	21,717	24,135
Interest Income Taxable Equivalent Adjustment - Tax	(325)	(334)	(343)	(331)	(333)	(301)	(217)	(188)
Net Income Available to Common Shareholders	23,386	22,732	22,148	19,814	22,222	20,126	18,251	28,996	88,080	89,595	89,352
Net earnings allocated to common shareholders	$ 23,161	$ 22,499	$ 21,942	$ 19,635	$ 21,992	$ 19,929	$ 18,051	$ 28,736	$ 87,237	$ 88,708	$ 88,546
Basic earnings per common share	$ 1.54	$ 1.47	$ 1.41	$ 1.25	$ 1.40	$ 1.25	$ 1.12	$ 1.79	$ 5.67	$ 5.55	$ 5.43
Diluted earnings per common share	$ 1.54	$ 1.47	$ 1.41	$ 1.25	$ 1.40	$ 1.25	$ 1.12	$ 1.78	$ 5.66	$ 5.55	$ 5.42
Basic	15,026	15,279	15,573	15,656	15,708	15,950	16,081	16,080	15,381	15,975	16,314
Average shares outstanding, diluted	15,056	15,302	15,594	15,687	15,733	15,970	16,097	16,101	15,407	15,995	16,333