Segment Information (Segment Financial Information) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Segment Reporting Information [Line Items]
Net Interest Income	$ 18,706	$ 18,321	$ 37,255	$ 36,517
Net Gains on Sales of Loans	784	386	1,533	862
Net Gains on Securities	262	244	725	472
Trust and Investment Product Fees	939	905	1,923	1,827
Insurance Revenues	1,515	1,482	4,060	4,038
Noncash Items:
Provision for Loan Losses	250	200	500	550
Depreciation and Amortization	1,086	1,206	2,207	2,422
Income Tax Expense (Benefit)	2,937	2,797	6,239	5,529
Segment Profit (Loss)	7,325	6,687	14,631	12,992
Segment Assets	2,259,686		2,259,686		$ 2,237,099
Core Banking
Segment Reporting Information [Line Items]
Net Interest Income	18,800	18,434	37,441	36,747
Net Gains on Sales of Loans	784	386	1,533	862
Net Gains on Securities	235	244	698	472
Trust and Investment Product Fees	1	0	2	2
Insurance Revenues	1	8	11	5
Noncash Items:
Provision for Loan Losses	250	200	500	550
Depreciation and Amortization	1,016	1,132	2,068	2,275
Income Tax Expense (Benefit)	3,075	2,954	6,138	5,444
Segment Profit (Loss)	7,268	6,670	13,948	12,368
Segment Assets	2,268,162		2,268,162		2,242,456
Trust and Investment Advisory Services
Segment Reporting Information [Line Items]
Net Interest Income	4	4	8	8
Net Gains on Sales of Loans	0	0	0	0
Net Gains on Securities	0	0	0	0
Trust and Investment Product Fees	938	905	1,921	1,825
Insurance Revenues	1	6	18	11
Noncash Items:
Provision for Loan Losses	0	0	0	0
Depreciation and Amortization	5	7	10	13
Income Tax Expense (Benefit)	(11)	(65)	(12)	(107)
Segment Profit (Loss)	(24)	(103)	(33)	(172)
Segment Assets	11,423		11,423		11,401
Insurance
Segment Reporting Information [Line Items]
Net Interest Income	1	1	2	2
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	1,513	1,468	4,031	4,022
Noncash Items:
Provision for Loan Losses	0	0	0	0
Depreciation and Amortization	27	30	54	59
Income Tax Expense (Benefit)	72	99	492	600
Segment Profit (Loss)	105	144	734	862
Segment Assets	7,405		7,405		6,429
Other
Segment Reporting Information [Line Items]
Net Interest Income	(99)	(118)	(196)	(240)
Net Gains on Sales of Loans	0	0	0	0
Net Gains on Securities	27	0	27	0
Trust and Investment Product Fees	0	0	0	0
Insurance Revenues	0	0	0	0
Noncash Items:
Provision for Loan Losses	0	0	0	0
Depreciation and Amortization	38	37	75	75
Income Tax Expense (Benefit)	(199)	(191)	(379)	(408)
Segment Profit (Loss)	(24)	$ (24)	(18)	$ (66)
Segment Assets	$ (27,304)		$ (27,304)		$ (23,187)