Business Segments (Statement of Operations and Total Assets by Reportable Segment) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Segment Reporting Information [Line Items]
Net interest income (expense)	[1]	$ 37,515	$ 34,754	$ 72,606	$ 67,625
Provision for credit losses		(3,000)	0	(2,900)	(2,000)
Net interest income (expense) after provision for credit losses		40,515	34,754	75,506	69,625
Noninterest income	[1]	15,852	20,593	33,011	46,567
Depreciation and amortization expense		1,048	1,064	2,103	2,118
Other noninterest expenses		30,029	31,948	60,193	65,607
Total noninterest expenses		31,077	33,012	62,296	67,725
Income (loss) before income taxes		25,290	22,335	46,221	48,467
Income tax expense		5,333	4,875	9,781	10,536
Net income		19,957	17,460	36,440	37,931
Total assets		5,982,891	5,851,980	5,982,891	5,851,980	$ 5,851,127
Expenditures for long-lived assets		1,647	917	2,481	1,828
Commercial Banking [Member]
Segment Reporting Information [Line Items]
Net interest income (expense)		37,563	34,768	72,671	67,652
Provision for credit losses		(3,000)	0	(2,900)	(2,000)
Net interest income (expense) after provision for credit losses		40,563	34,768	75,571	69,652
Noninterest income		5,619	10,079	12,131	25,070
Depreciation and amortization expense		707	688	1,418	1,365
Other noninterest expenses		22,504	24,322	45,114	50,887
Total noninterest expenses		23,211	25,010	46,532	52,252
Income (loss) before income taxes		22,971	19,837	41,170	42,470
Income tax expense		4,748	4,250	8,545	9,085
Net income		18,223	15,587	32,625	33,385
Total assets		5,908,644	5,778,879	5,908,644	5,778,879
Expenditures for long-lived assets		1,558	883	2,288	1,717
Wealth Management Services [Member]
Segment Reporting Information [Line Items]
Net interest income (expense)		(48)	(14)	(65)	(27)
Provision for credit losses		0	0	0	0
Net interest income (expense) after provision for credit losses		(48)	(14)	(65)	(27)
Noninterest income		10,233	10,514	20,880	21,497
Depreciation and amortization expense		341	376	685	753
Other noninterest expenses		7,525	7,626	15,079	14,720
Total noninterest expenses		7,866	8,002	15,764	15,473
Income (loss) before income taxes		2,319	2,498	5,051	5,997
Income tax expense		585	625	1,236	1,451
Net income		1,734	1,873	3,815	4,546
Total assets		74,247	73,101	74,247	73,101
Expenditures for long-lived assets		$ 89	$ 34	$ 193	$ 111

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