Business Segments (Statement of Operations and Total Assets by Reportable Segment) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Net interest income (expense)	[1]	$ 141,435	$ 127,444	$ 133,414
Provision for credit losses		(4,822)	12,342	1,575
Net interest income after provision for credit losses		146,257	115,102	131,839
Noninterest income	[1]	87,394	99,442	67,080
Depreciation and amortization expense		4,301	4,090	4,234
Other noninterest expenses		131,163	121,294	106,506
Noninterest expense		135,464	125,384	110,740
Income before income taxes		98,187	89,160	88,179
Income tax expense		21,317	19,331	19,061
Net income		76,870	69,829	69,118
Total assets		5,851,127	5,713,169	5,292,659
Expenditures for long-lived assets		3,490	3,406	3,132
Commercial Banking [Member]
Segment Reporting Information [Line Items]
Net interest income (expense)		141,493	127,545	133,762
Provision for credit losses		(4,822)	12,342	1,575
Net interest income after provision for credit losses		146,315	115,203	132,187
Noninterest income		44,748	63,612	29,972
Depreciation and amortization expense		2,827	2,573	2,681
Other noninterest expenses		101,029	91,555	78,549
Noninterest expense		103,856	94,128	81,230
Income before income taxes		87,207	84,687	80,929
Income tax expense		18,575	17,989	17,121
Net income		68,632	66,698	63,808
Total assets		5,776,754	5,639,669	5,219,578
Expenditures for long-lived assets		3,246	3,125	2,610
Wealth Management Services [Member]
Segment Reporting Information [Line Items]
Net interest income (expense)		(58)	(101)	(348)
Provision for credit losses		0	0	0
Net interest income after provision for credit losses		(58)	(101)	(348)
Noninterest income		42,646	35,830	37,108
Depreciation and amortization expense		1,474	1,517	1,553
Other noninterest expenses		30,134	29,739	27,957
Noninterest expense		31,608	31,256	29,510
Income before income taxes		10,980	4,473	7,250
Income tax expense		2,742	1,342	1,940
Net income		8,238	3,131	5,310
Total assets		74,373	73,500	73,081
Expenditures for long-lived assets		$ 244	$ 281	$ 522

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