Segment Information (Segment Financial Information) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Segment Reporting Information [Line Items]
Net Interest Income	$ 18,549	$ 18,196
Net Gains on Sales of Loans	749	476
Net Gains on Securities	463	228
Trust and Investment Product Fees	984	922
Insurance Revenues	2,545	2,556
Noncash Items:
Provision for Loan Losses	250	350
Depreciation and Amortization	1,121	1,216
Income Tax Expense (Benefit)	3,302	2,732
Segment Profit (Loss)	7,306	6,305
Segment Assets	2,240,223		2,237,099
Core Banking
Segment Reporting Information [Line Items]
Net Interest Income	18,641	18,313
Net Gains on Sales of Loans	749	476
Net Gains on Securities	463	228
Trust and Investment Product Fees	1	2
Insurance Revenues	10	(3)
Noncash Items:
Provision for Loan Losses	250	350
Depreciation and Amortization	1,052	1,143
Income Tax Expense (Benefit)	3,063	2,490
Segment Profit (Loss)	6,680	5,698
Segment Assets	2,245,296		2,242,456
Trust and Investment Advisory Services
Segment Reporting Information [Line Items]
Net Interest Income	4	4
Net Gains on Sales of Loans	0	0
Net Gains on Securities	0	0
Trust and Investment Product Fees	983	920
Insurance Revenues	17	5
Noncash Items:
Provision for Loan Losses	0	0
Depreciation and Amortization	5	6
Income Tax Expense (Benefit)	(1)	(42)
Segment Profit (Loss)	(9)	(69)
Segment Assets	11,361		11,401
Insurance
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	0	0
Insurance Revenues	2,518	2,554
Noncash Items:
Provision for Loan Losses	0	0
Depreciation and Amortization	27	29
Income Tax Expense (Benefit)	420	501
Segment Profit (Loss)	629	718
Segment Assets	6,889		6,429
Other
Segment Reporting Information [Line Items]
Net Interest Income	(97)	(122)
Net Gains on Sales of Loans	0	0
Net Gains on Securities	0	0
Trust and Investment Product Fees	0	0
Insurance Revenues	0	0
Noncash Items:
Provision for Loan Losses	0	0
Depreciation and Amortization	37	38
Income Tax Expense (Benefit)	(180)	(217)
Segment Profit (Loss)	6	(42)
Segment Assets	$ (23,323)		$ (23,187)