Segment Information (Segment Financial Information) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Segment Reporting Information [Line Items]
Net Interest Income	$ 24,725	$ 20,784
Net Gains on Sales of Loans	687	720
Net Gains on Securities	0	0
Trust and Investment Product Fees	1,243	1,021
Insurance Revenues	2,640	2,727
Noncash Items:
Provision for Loan Losses	500	850
Depreciation and Amortization	1,127	1,048
Income Tax Expense (Benefit)	3,821	1,765
Segment Profit (Loss)	9,556	5,146
Segment Assets	2,933,144		$ 2,955,994
Operating Segments | Core Banking
Segment Reporting Information [Line Items]
Net Interest Income	24,909	20,898
Net Gains on Sales of Loans	687	720
Net Gains on Securities	0	0
Trust and Investment Product Fees	1	1
Insurance Revenues	2	4
Noncash Items:
Provision for Loan Losses	500	850
Depreciation and Amortization	1,041	973
Income Tax Expense (Benefit)	3,622	1,681
Segment Profit (Loss)	8,965	5,081
Segment Assets	2,934,056		2,958,585
Operating Segments | Trust and Investment Advisory Services
Segment Reporting Information [Line Items]
Net Interest Income	1	(1)
Net Gains on Sales of Loans	0	0
Net Gains on Securities	0	0
Trust and Investment Product Fees	1,244	1,020
Insurance Revenues	5	8
Noncash Items:
Provision for Loan Losses	0	0
Depreciation and Amortization	3	3
Income Tax Expense (Benefit)	34	14
Segment Profit (Loss)	44	7
Segment Assets	1,865		1,851
Operating Segments | Insurance
Segment Reporting Information [Line Items]
Net Interest Income	2	2
Net Gains on Sales of Loans	0	0
Net Gains on Securities	0	0
Trust and Investment Product Fees	0	0
Insurance Revenues	2,633	2,715
Noncash Items:
Provision for Loan Losses	0	0
Depreciation and Amortization	19	26
Income Tax Expense (Benefit)	427	510
Segment Profit (Loss)	673	790
Segment Assets	9,532		8,494
Other
Segment Reporting Information [Line Items]
Net Interest Income	(187)	(115)
Net Gains on Sales of Loans	0	0
Net Gains on Securities	0	0
Trust and Investment Product Fees	(2)	0
Insurance Revenues	0	0
Noncash Items:
Provision for Loan Losses	0	0
Depreciation and Amortization	64	46
Income Tax Expense (Benefit)	(262)	(440)
Segment Profit (Loss)	(126)	$ (732)
Segment Assets	$ (12,309)		$ (12,936)