Business Segments (Statement of Operations and Total Assets by Reportable Segment) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Segment Reporting Information [Line Items]
Net interest income (expense)	[1]	$ 33,751	$ 42,042	$ 104,444	$ 114,648
Provision for credit losses		500	800	2,000	(2,100)
Net interest income (expense) after provision for credit losses		33,251	41,242	102,444	116,748
Noninterest income	[1]	15,226	15,803	42,834	48,814
Depreciation and amortization expense		1,238	1,099	3,641	3,202
Other noninterest expenses		33,152	31,968	97,329	92,161
Total noninterest expenses		34,390	33,067	100,970	95,363
Income (loss) before income taxes		14,087	23,978	44,308	70,199
Income tax expense		2,926	5,310	9,079	15,091
Net income		11,161	18,668	35,229	55,108
Total assets		7,183,475	6,408,051	7,183,475	6,408,051	$ 6,660,051
Expenditures for long-lived assets		504	1,343	3,524	3,824
Commercial Banking [Member]
Segment Reporting Information [Line Items]
Net interest income (expense)		33,741	42,038	104,407	114,709
Provision for credit losses		500	800	2,000	(2,100)
Net interest income (expense) after provision for credit losses		33,241	41,238	102,407	116,809
Noninterest income		6,105	6,043	15,679	18,174
Depreciation and amortization expense		892	751	2,582	2,168
Other noninterest expenses		25,719	23,995	74,801	69,110
Total noninterest expenses		26,611	24,746	77,383	71,278
Income (loss) before income taxes		12,735	22,535	40,703	63,705
Income tax expense		2,621	4,878	8,226	13,423
Net income		10,114	17,657	32,477	50,282
Total assets		7,127,117	6,332,986	7,127,117	6,332,986
Expenditures for long-lived assets		498	1,206	3,493	3,494
Wealth Management Services [Member]
Segment Reporting Information [Line Items]
Net interest income (expense)		10	4	37	(61)
Provision for credit losses		0	0	0	0
Net interest income (expense) after provision for credit losses		10	4	37	(61)
Noninterest income		9,121	9,760	27,155	30,640
Depreciation and amortization expense		346	348	1,059	1,034
Other noninterest expenses		7,433	7,973	22,528	23,051
Total noninterest expenses		7,779	8,321	23,587	24,085
Income (loss) before income taxes		1,352	1,443	3,605	6,494
Income tax expense		305	432	853	1,668
Net income		1,047	1,011	2,752	4,826
Total assets		56,358	75,065	56,358	75,065
Expenditures for long-lived assets		$ 6	$ 137	$ 31	$ 330

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