Segment Information (Segment Financial Information) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Segment Reporting Information [Line Items]
Net Interest Income	$ 18,321	$ 16,712	$ 36,517	$ 32,937
Net Gains on Sales of Loans	386	809	862	1,563
Net Gains on Securities	244	467	472	1,080
Trust and Investment Product Fees	905	814	1,827	1,631
Insurance Revenues	1,482	1,379	4,038	3,163
Noncash Items:
Provision for Loan Losses	200	(200)	550	150
Depreciation and Amortization	1,206	1,125	2,422	2,224
Income Tax Expense (Benefit)	2,797	3,229	5,529	5,743
Segment Profit (Loss)	6,687	6,532	12,992	12,341
Segment Assets	2,193,573		2,193,573		2,163,827
Core Banking [Member]
Segment Reporting Information [Line Items]
Net Interest Income	18,434	17,004	36,747	33,768
Net Gains on Sales of Loans	386	809	862	1,563
Net Gains on Securities	244	467	472	1,080
Trust and Investment Product Fees	0	1	2	4
Insurance Revenues	8	6	5	15
Noncash Items:
Provision for Loan Losses	200	(200)	550	150
Depreciation and Amortization	1,132	973	2,275	1,923
Income Tax Expense (Benefit)	2,954	3,626	5,444	6,370
Segment Profit (Loss)	6,670	6,833	12,368	12,681
Segment Assets	2,201,207		2,201,207		2,171,837
Trust and Investment Advisory Services [Member]
Segment Reporting Information [Line Items]
Net Interest Income	4	6	8	11
Net Gains on Sales of Loans	0	0	0	0
Net Gains on Securities	0	0	0	0
Trust and Investment Product Fees	905	813	1,825	1,628
Insurance Revenues	6	6	11	19
Noncash Items:
Provision for Loan Losses	0	0	0	0
Depreciation and Amortization	7	8	13	15
Income Tax Expense (Benefit)	(65)	(24)	(107)	(26)
Segment Profit (Loss)	(103)	(41)	(172)	(49)
Segment Assets	11,501		11,501		11,663
Insurance [Member]
Segment Reporting Information [Line Items]
Net Interest Income	1	5	2	12
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	1,468	1,367	4,022	3,129
Noncash Items:
Provision for Loan Losses	0	0	0	0
Depreciation and Amortization	30	106	59	211
Income Tax Expense (Benefit)	99	40	600	187
Segment Profit (Loss)	144	27	862	238
Segment Assets	5,873		5,873		5,636
Other [Member]
Segment Reporting Information [Line Items]
Net Interest Income	(118)	(303)	(240)	(854)
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	(1)
Insurance Revenues	0	0	0	0
Noncash Items:
Provision for Loan Losses	0	0	0	0
Depreciation and Amortization	37	38	75	75
Income Tax Expense (Benefit)	(191)	(413)	(408)	(788)
Segment Profit (Loss)	(24)	(287)	(66)	(529)
Segment Assets	$ (25,008)		$ (25,008)		$ (25,309)