Business Segments (Statement of Operations and Total Assets by Reportable Segment) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Net interest income (expense)	[1]	$ 155,990	$ 141,435	$ 127,444
Provision for credit losses		(1,300)	(4,822)	12,342
Net interest income after provision for credit losses		157,290	146,257	115,102
Noninterest income	[1]	62,602	87,394	99,442
Depreciation and amortization expense		4,325	4,301	4,090
Other noninterest expenses		124,397	131,163	121,294
Noninterest expense		128,722	135,464	125,384
Income before income taxes		91,170	98,187	89,160
Income tax expense		19,489	21,317	19,331
Net income		71,681	76,870	69,829
Total assets		6,660,051	5,851,127	5,713,169
Expenditures for long-lived assets		6,139	3,490	3,406
Commercial Banking [Member]
Segment Reporting Information [Line Items]
Net interest income (expense)		156,040	141,493	127,545
Provision for credit losses		(1,300)	(4,822)	12,342
Net interest income after provision for credit losses		157,340	146,315	115,203
Noninterest income		23,088	44,748	63,612
Depreciation and amortization expense		2,948	2,827	2,573
Other noninterest expenses		94,025	101,029	91,555
Noninterest expense		96,973	103,856	94,128
Income before income taxes		83,455	87,207	84,687
Income tax expense		17,557	18,575	17,989
Net income		65,898	68,632	66,698
Total assets		6,585,310	5,776,754	5,639,669
Expenditures for long-lived assets		5,475	3,246	3,125
Wealth Management Services [Member]
Segment Reporting Information [Line Items]
Net interest income (expense)		(50)	(58)	(101)
Provision for credit losses		0	0	0
Net interest income after provision for credit losses		(50)	(58)	(101)
Noninterest income		39,514	42,646	35,830
Depreciation and amortization expense		1,377	1,474	1,517
Other noninterest expenses		30,372	30,134	29,739
Noninterest expense		31,749	31,608	31,256
Income before income taxes		7,715	10,980	4,473
Income tax expense		1,932	2,742	1,342
Net income		5,783	8,238	3,131
Total assets		74,741	74,373	73,500
Expenditures for long-lived assets		$ 664	$ 244	$ 281

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