Segment Information (Segment Financial Information) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Segment Reporting Information [Line Items]
Net Interest Income	$ 16,225	$ 16,612
Net Gains on Sales of Loans	754	713
Net Gains on Securities	613	18
Trust and Investment Product Fees	817	696
Insurance Revenues	1,784	1,391
Noncash Items:
Provision for Loan Losses	350	690
Depreciation and Amortization	1,099	1,256
Income Tax Expense (Benefit)	2,514	2,528
Segment Profit (Loss)	5,809	5,602
Segment Assets	1,979,022		2,006,300
Core Banking [Member]
Segment Reporting Information [Line Items]
Net Interest Income	16,764	17,141
Net Gains on Sales of Loans	754	713
Net Gains on Securities	613	18
Trust and Investment Product Fees	3	1
Insurance Revenues	9	10
Noncash Items:
Provision for Loan Losses	350	690
Depreciation and Amortization	950	1,109
Income Tax Expense (Benefit)	2,744	2,875
Segment Profit (Loss)	5,848	5,932
Segment Assets	1,983,625	2,006,992
Trust and Investment Advisory Services [Member]
Segment Reporting Information [Line Items]
Net Interest Income	5	3
Net Gains on Sales of Loans	0	0
Net Gains on Securities	0	0
Trust and Investment Product Fees	815	696
Insurance Revenues	13	18
Noncash Items:
Provision for Loan Losses	0	0
Depreciation and Amortization	7	5
Income Tax Expense (Benefit)	(2)	(48)
Segment Profit (Loss)	(8)	(77)
Segment Assets	11,535	11,551
Insurance [Member]
Segment Reporting Information [Line Items]
Net Interest Income	7	7
Net Gains on Sales of Loans	0	0
Net Gains on Securities	0	0
Trust and Investment Product Fees	0	0
Insurance Revenues	1,762	1,363
Noncash Items:
Provision for Loan Losses	0	0
Depreciation and Amortization	105	105
Income Tax Expense (Benefit)	147	40
Segment Profit (Loss)	211	56
Segment Assets	8,394	8,333
Other [Member]
Segment Reporting Information [Line Items]
Net Interest Income	(551)	(539)
Net Gains on Sales of Loans	0	0
Net Gains on Securities	0	0
Trust and Investment Product Fees	(1)	(1)
Insurance Revenues	0	0
Noncash Items:
Provision for Loan Losses	0	0
Depreciation and Amortization	37	37
Income Tax Expense (Benefit)	(375)	(339)
Segment Profit (Loss)	(242)	(309)
Segment Assets	$ (24,532)	$ (20,576)