Business Segments (Statement of Operations and Total Assets by Reportable Segment) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Segment Reporting Information [Line Items]
Net interest income (expense)	[1]	$ 32,871	$ 32,602
Provision for credit losses		(2,000)	7,036
Net interest income after provision for credit losses		34,871	25,566
Noninterest income	[1]	25,974	19,927
Depreciation and amortization expense		1,054	1,013
Other noninterest expenses related to segments		33,659	29,440
Total noninterest expense		34,713	30,453
Income before income taxes		26,132	15,040
Income tax expense		5,661	3,139
Net income		20,471	11,901
Total assets		5,719,389	5,620,979	$ 5,713,169
Expenditures for long-lived assets		911	628
Commercial Banking [Member]
Segment Reporting Information [Line Items]
Net interest income (expense)		34,520	29,009
Provision for credit losses		(2,000)	7,036
Net interest income after provision for credit losses		36,520	21,973
Noninterest income		14,515	10,665
Depreciation and amortization expense		657	619
Other noninterest expenses related to segments		20,001	18,842
Total noninterest expense		20,658	19,461
Income before income taxes		30,377	13,177
Income tax expense		6,592	2,764
Net income		23,785	10,413
Total assets		4,491,675	4,367,469
Expenditures for long-lived assets		835	526
Wealth Management Services [Member]
Segment Reporting Information [Line Items]
Net interest income (expense)		(23)	(67)
Provision for credit losses		0	0
Net interest income after provision for credit losses		(23)	(67)
Noninterest income		10,895	8,689
Depreciation and amortization expense		351	354
Other noninterest expenses related to segments		6,386	6,846
Total noninterest expense		6,737	7,200
Income before income taxes		4,135	1,422
Income tax expense		954	356
Net income		3,181	1,066
Total assets		74,902	74,283
Expenditures for long-lived assets		58	53
Corporate [Member]
Segment Reporting Information [Line Items]
Net interest income (expense)		(1,626)	3,660
Provision for credit losses		0	0
Net interest income after provision for credit losses		(1,626)	3,660
Noninterest income		564	573
Depreciation and amortization expense		46	40
Other noninterest expenses related to segments		7,272	3,752
Total noninterest expense		7,318	3,792
Income before income taxes		(8,380)	441
Income tax expense		(1,885)	19
Net income		(6,495)	422
Total assets		1,152,812	1,179,227
Expenditures for long-lived assets		$ 18	$ 49

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