Segment Information (Segment Financial Information) (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Segment Reporting Information [Line Items]
Net Interest Income	$ 38,388			$ 38,578			$ 113,103	$ 105,810
Net Gains on Sales of Loans	2,861			1,649			7,378	3,660
Net Gains on Securities	607			313			2,190	984
Trust and Investment Product Fees	1,957			1,885			5,855	5,365
Insurance Revenues	1,989			1,883			7,048	7,017
Noncash Items:
Provision for Credit Losses	4,500			2,800			15,550	3,725
Depreciation and Amortization	2,335			2,291			7,043	6,364
Income Tax Expense (Benefit)	3,154			2,809			8,180	8,568
Segment Profit (Loss)	14,593	$ 14,255	$ 12,472	13,064	$ 15,271	$ 15,067	41,320	43,402
Segment Assets	4,852,830						4,852,830		$ 4,397,672
Operating Segments | Core Banking
Segment Reporting Information [Line Items]
Net Interest Income	39,039			39,302			115,148	107,619
Net Gains on Sales of Loans	2,861			1,649			7,378	3,660
Net Gains on Securities	607			313			2,190	984
Trust and Investment Product Fees	2			1			3	3
Insurance Revenues	6			14			11	21
Noncash Items:
Provision for Credit Losses	4,500			2,800			15,550	3,725
Depreciation and Amortization	2,237			2,196			6,748	6,099
Income Tax Expense (Benefit)	3,268			3,025			8,635	9,117
Segment Profit (Loss)	14,628			13,538			40,573	43,105
Segment Assets	4,837,899						4,837,899		4,381,945
Operating Segments | Wealth Management Services
Segment Reporting Information [Line Items]
Net Interest Income	4			4			12	10
Net Gains on Sales of Loans	0			0			0	0
Net Gains on Securities	0			0			0	0
Trust and Investment Product Fees	1,955			1,884			5,852	5,362
Insurance Revenues	1			2			12	27
Noncash Items:
Provision for Credit Losses	0			0			0	0
Depreciation and Amortization	2			1			4	4
Income Tax Expense (Benefit)	108			137			336	341
Segment Profit (Loss)	321			406			991	993
Segment Assets	4,283						4,283		3,670
Operating Segments | Insurance
Segment Reporting Information [Line Items]
Net Interest Income	2			5			9	14
Net Gains on Sales of Loans	0			0			0	0
Net Gains on Securities	0			0			0	0
Trust and Investment Product Fees	0			0			0	0
Insurance Revenues	1,982			1,867			7,025	6,969
Noncash Items:
Provision for Credit Losses	0			0			0	0
Depreciation and Amortization	16			14			50	53
Income Tax Expense (Benefit)	71			51			471	458
Segment Profit (Loss)	216			145			1,437	1,382
Segment Assets	10,247						10,247		9,080
Other
Segment Reporting Information [Line Items]
Net Interest Income	(657)			(733)			(2,066)	(1,833)
Net Gains on Sales of Loans	0			0			0	0
Net Gains on Securities	0			0			0	0
Trust and Investment Product Fees	0			0			0	0
Insurance Revenues	0			0			0	0
Noncash Items:
Provision for Credit Losses	0			0			0	0
Depreciation and Amortization	80			80			241	208
Income Tax Expense (Benefit)	(293)			(404)			(1,262)	(1,348)
Segment Profit (Loss)	(572)			$ (1,025)			(1,681)	$ (2,078)
Segment Assets	$ 401						$ 401		$ 2,977