Segment Information (Segment Financial Information) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Segment Reporting Information [Line Items]
Net Interest Income	$ 18,791	$ 17,192	$ 55,308	$ 50,129
Net Gains on Sales of Loans	613	613	1,475	2,176
Net Gains on Securities	567	428	1,039	1,508
Trust and Investment Product Fees	901	802	2,728	2,433
Insurance Revenues	1,739	1,495	5,777	4,658
Noncash Items:
Provision for Loan Losses	0	(400)	550	(250)
Depreciation and Amortization	1,189	1,084	3,611	3,308
Income Tax Expense (Benefit)	3,438	2,969	8,967	8,712
Segment Profit (Loss)	7,708	6,483	20,700	18,824
Segment Assets	2,205,921		2,205,921		2,163,827
Core Banking
Segment Reporting Information [Line Items]
Net Interest Income	18,908	17,334	55,655	51,102
Net Gains on Sales of Loans	613	613	1,475	2,176
Net Gains on Securities	567	415	1,039	1,495
Trust and Investment Product Fees	2	1	4	5
Insurance Revenues	15	10	20	25
Noncash Items:
Provision for Loan Losses	0	(400)	550	(250)
Depreciation and Amortization	1,120	941	3,395	2,864
Income Tax Expense (Benefit)	3,496	3,218	8,940	9,588
Segment Profit (Loss)	7,540	6,581	19,908	19,262
Segment Assets	2,213,848		2,213,848		2,171,837
Trust and Investment Advisory Services
Segment Reporting Information [Line Items]
Net Interest Income	4	5	12	16
Net Gains on Sales of Loans	0	0	0	0
Net Gains on Securities	0	0	0	0
Trust and Investment Product Fees	899	802	2,724	2,430
Insurance Revenues	22	7	33	26
Noncash Items:
Provision for Loan Losses	0	0	0	0
Depreciation and Amortization	5	6	18	21
Income Tax Expense (Benefit)	(15)	(24)	(122)	(50)
Segment Profit (Loss)	(30)	(41)	(202)	(90)
Segment Assets	11,452		11,452		11,663
Insurance
Segment Reporting Information [Line Items]
Net Interest Income	1	4	3	16
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	1,702	1,478	5,724	4,607
Noncash Items:
Provision for Loan Losses	0	0	0	0
Depreciation and Amortization	26	99	85	310
Income Tax Expense (Benefit)	147	67	747	254
Segment Profit (Loss)	216	96	1,078	334
Segment Assets	6,442		6,442		5,636
Other
Segment Reporting Information [Line Items]
Net Interest Income	(122)	(151)	(362)	(1,005)
Net Gains on Sales of Loans	0	0	0	0
Net Gains on Securities	0	13	0	13
Trust and Investment Product Fees	0	(1)	0	(2)
Insurance Revenues	0	0	0	0
Noncash Items:
Provision for Loan Losses	0	0	0	0
Depreciation and Amortization	38	38	113	113
Income Tax Expense (Benefit)	(190)	(292)	(598)	(1,080)
Segment Profit (Loss)	(18)	(153)	(84)	(682)
Segment Assets	$ (25,821)		$ (25,821)		$ (25,309)