Business Segments (Statement of Operations and Total Assets by Reportable Segment) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Segment Reporting Information [Line Items]
Net interest income (expense)	[1]	$ 42,042	$ 36,070	$ 114,648	$ 103,695
Provision for credit losses		800	0	(2,100)	(2,000)
Net interest income (expense) after provision for credit losses		41,242	36,070	116,748	105,695
Noninterest income	[1]	15,803	20,520	48,814	67,087
Depreciation and amortization expense		1,099	1,105	3,202	3,223
Other noninterest expenses		31,968	31,415	92,161	97,022
Total noninterest expenses		33,067	32,520	95,363	100,245
Income (loss) before income taxes		23,978	24,070	70,199	72,537
Income tax expense		5,310	5,319	15,091	15,855
Net income		18,668	18,751	55,108	56,682
Total assets		6,408,051	6,002,643	6,408,051	6,002,643	$ 5,851,127
Expenditures for long-lived assets		1,343	338	3,824	2,166
Commercial Banking [Member]
Segment Reporting Information [Line Items]
Net interest income (expense)		42,038	36,085	114,709	103,737
Provision for credit losses		800	0	(2,100)	(2,000)
Net interest income (expense) after provision for credit losses		41,238	36,085	116,809	105,737
Noninterest income		6,043	9,962	18,174	35,032
Depreciation and amortization expense		751	740	2,168	2,105
Other noninterest expenses		23,995	23,538	69,110	74,425
Total noninterest expenses		24,746	24,278	71,278	76,530
Income (loss) before income taxes		22,535	21,769	63,705	64,239
Income tax expense		4,878	4,725	13,423	13,810
Net income		17,657	17,044	50,282	50,429
Total assets		6,332,986	5,929,230	6,332,986	5,929,230
Expenditures for long-lived assets		1,206	310	3,494	2,027
Wealth Management Services [Member]
Segment Reporting Information [Line Items]
Net interest income (expense)		4	(15)	(61)	(42)
Provision for credit losses		0	0	0	0
Net interest income (expense) after provision for credit losses		4	(15)	(61)	(42)
Noninterest income		9,760	10,558	30,640	32,055
Depreciation and amortization expense		348	365	1,034	1,118
Other noninterest expenses		7,973	7,877	23,051	22,597
Total noninterest expenses		8,321	8,242	24,085	23,715
Income (loss) before income taxes		1,443	2,301	6,494	8,298
Income tax expense		432	594	1,668	2,045
Net income		1,011	1,707	4,826	6,253
Total assets		75,065	73,413	75,065	73,413
Expenditures for long-lived assets		$ 137	$ 28	$ 330	$ 139

[1] As reported in the Unaudited Consolidated Statements of Income.