Business Segments (Statement of Operations and Total Assets by Reportable Segment) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Segment Reporting Information [Line Items]
Net interest income (expense)	[1]	$ 36,070	$ 31,654	$ 103,695	$ 95,201
Provision for credit losses		0	1,325	(2,000)	10,561
Interest Income (Expense), after Provision for Loan Loss		36,070	30,329	105,695	84,640
Noninterest income	[1]	20,520	25,468	67,087	71,715
Depreciation and amortization expense		1,105	989	3,223	3,006
Other noninterest expenses related to segments		31,415	31,355	97,022	88,269
Noninterest Expense		32,520	32,344	100,245	91,275
Income (loss) before income taxes		24,070	23,453	72,537	65,080
Income tax expense		5,319	5,131	15,855	13,817
Net Income (Loss) Attributable to Parent		18,751	18,322	56,682	51,263
Total assets		6,002,643	5,849,792	6,002,643	5,849,792	$ 5,713,169
Expenditures for long-lived assets		338	406	2,166	1,331
Commercial Banking [Member]
Segment Reporting Information [Line Items]
Net interest income (expense)		35,732	33,103	105,579	94,692
Provision for credit losses		0	1,325	(2,000)	10,561
Interest Income (Expense), after Provision for Loan Loss		35,732	31,778	107,579	84,131
Noninterest income		9,440	15,940	33,510	43,515
Depreciation and amortization expense		718	601	2,040	1,832
Other noninterest expenses related to segments		20,108	20,273	60,093	56,571
Noninterest Expense		20,826	20,874	62,133	58,403
Income (loss) before income taxes		24,346	26,844	78,956	69,243
Income tax expense		5,394	5,828	17,275	14,769
Net Income (Loss) Attributable to Parent		18,952	21,016	61,681	54,474
Total assets		4,520,169	4,588,419	4,520,169	4,588,419
Expenditures for long-lived assets		309	360	2,026	1,147
Wealth Management Services [Member]
Segment Reporting Information [Line Items]
Net interest income (expense)		(25)	(24)	(72)	(117)
Provision for credit losses		0	0	0	0
Interest Income (Expense), after Provision for Loan Loss		(25)	(24)	(72)	(117)
Noninterest income		10,455	8,954	31,778	26,248
Depreciation and amortization expense		341	350	1,044	1,058
Other noninterest expenses related to segments		7,190	7,178	20,594	20,408
Noninterest Expense		7,531	7,528	21,638	21,466
Income (loss) before income taxes		2,899	1,402	10,068	4,665
Income tax expense		710	403	2,412	1,216
Net Income (Loss) Attributable to Parent		2,189	999	7,656	3,449
Total assets		75,438	74,942	75,438	74,942
Expenditures for long-lived assets		13	20	87	86
Corporate [Member]
Segment Reporting Information [Line Items]
Net interest income (expense)		363	(1,425)	(1,812)	626
Provision for credit losses		0	0	0	0
Interest Income (Expense), after Provision for Loan Loss		363	(1,425)	(1,812)	626
Noninterest income		625	574	1,799	1,952
Depreciation and amortization expense		46	38	139	116
Other noninterest expenses related to segments		4,117	3,904	16,335	11,290
Noninterest Expense		4,163	3,942	16,474	11,406
Income (loss) before income taxes		(3,175)	(4,793)	(16,487)	(8,828)
Income tax expense		(785)	(1,100)	(3,832)	(2,168)
Net Income (Loss) Attributable to Parent		(2,390)	(3,693)	(12,655)	(6,660)
Total assets		1,407,036	1,186,431	1,407,036	1,186,431
Expenditures for long-lived assets		$ 16	$ 26	$ 53	$ 98

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