Segment Information (Segment Financial Information) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Segment Reporting Information [Line Items]
Net Interest Income	$ 17,192	$ 16,393	$ 50,129	$ 49,654
Net Gains on Sales of Loans	613	941	2,176	2,330
Net Gains on Securities	428	598	1,508	692
Trust and Investment Product Fees	802	659	2,433	2,019
Insurance Revenues	1,495	1,469	4,658	4,218
Noncash Items:
Provision for Loan Losses	(400)	640	(250)	1,721
Depreciation and Amortization	1,084	1,085	3,308	3,584
Income Tax Expense (Benefit)	2,969	2,891	8,712	8,120
Segment Profit (Loss)	6,483	6,292	18,824	17,861
Segment Assets	2,060,122		2,060,122		2,006,300
Core Banking [Member]
Segment Reporting Information [Line Items]
Net Interest Income	17,334	16,909	51,102	51,213
Net Gains on Sales of Loans	613	941	2,176	2,330
Net Gains on Securities	415	598	1,495	692
Trust and Investment Product Fees	1	0	5	3
Insurance Revenues	10	3	25	19
Noncash Items:
Provision for Loan Losses	(400)	640	(250)	1,721
Depreciation and Amortization	941	941	2,864	3,145
Income Tax Expense (Benefit)	3,218	3,186	9,588	9,041
Segment Profit (Loss)	6,581	6,578	19,262	18,737
Segment Assets	2,068,392		2,068,392		2,006,992
Trust and Investment Advisory Services [Member]
Segment Reporting Information [Line Items]
Net Interest Income	5	6	16	16
Net Gains on Sales of Loans	0	0	0	0
Net Gains on Securities	0	0	0	0
Trust and Investment Product Fees	802	659	2,430	2,018
Insurance Revenues	7	5	26	32
Noncash Items:
Provision for Loan Losses	0	0	0	0
Depreciation and Amortization	6	6	21	16
Income Tax Expense (Benefit)	(24)	(45)	(50)	(103)
Segment Profit (Loss)	(41)	(71)	(90)	(168)
Segment Assets	11,641		11,641		11,551
Insurance [Member]
Segment Reporting Information [Line Items]
Net Interest Income	4	9	16	26
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	1,478	1,461	4,607	4,167
Noncash Items:
Provision for Loan Losses	0	0	0	0
Depreciation and Amortization	99	101	310	311
Income Tax Expense (Benefit)	67	70	254	176
Segment Profit (Loss)	96	100	334	245
Segment Assets	8,149		8,149		8,333
Other [Member]
Segment Reporting Information [Line Items]
Net Interest Income	(151)	(531)	(1,005)	(1,601)
Net Gains on Sales of Loans	0	0	0	0
Net Gains on Securities	13	0	13	0
Trust and Investment Product Fees	(1)	0	(2)	(2)
Insurance Revenues	0	0	0	0
Noncash Items:
Provision for Loan Losses	0	0	0	0
Depreciation and Amortization	38	37	113	112
Income Tax Expense (Benefit)	(292)	(320)	(1,080)	(994)
Segment Profit (Loss)	(153)	(315)	(682)	(953)
Segment Assets	$ (28,060)		$ (28,060)		$ (20,576)