Segment Information (Segment Financial Information) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Segment Reporting Information [Line Items]
Net Interest Income	$ 16,712	$ 16,649	$ 32,937	$ 33,261
Net Gains on Sales of Loans	809	676	1,563	1,389
Net Gains on Securities	467	76	1,080	94
Trust and Investment Product Fees	814	664	1,631	1,360
Insurance Revenues	1,379	1,358	3,163	2,749
Noncash Items:
Provision for Loan Losses	200	(391)	(150)	(1,081)
Depreciation and Amortization	1,125	1,243	2,224	2,499
Income Tax Expense (Benefit)	3,229	2,701	5,743	5,229
Segment Profit (Loss)	6,532	5,967	12,341	11,569
Segment Assets	2,010,612		2,010,612		2,006,300
Core Banking [Member]
Segment Reporting Information [Line Items]
Net Interest Income	17,004	17,163	33,768	34,304
Net Gains on Sales of Loans	809	676	1,563	1,389
Net Gains on Securities	467	76	1,080	94
Trust and Investment Product Fees	1	2	4	3
Insurance Revenues	6	6	15	16
Noncash Items:
Provision for Loan Losses	(200)	391	150	1,081
Depreciation and Amortization	973	1,095	1,923	2,204
Income Tax Expense (Benefit)	3,626	2,980	6,370	5,855
Segment Profit (Loss)	6,833	6,227	12,681	12,159
Segment Assets	2,019,229		2,019,229		2,006,992
Trust and Investment Advisory Services [Member]
Segment Reporting Information [Line Items]
Net Interest Income	6	7	11	10
Net Gains on Sales of Loans	0	0	0	0
Net Gains on Securities	0	0	0	0
Trust and Investment Product Fees	813	663	1,628	1,359
Insurance Revenues	6	9	19	27
Noncash Items:
Provision for Loan Losses	0	0	0	0
Depreciation and Amortization	8	5	15	10
Income Tax Expense (Benefit)	(24)	(10)	(26)	(58)
Segment Profit (Loss)	(41)	(20)	(49)	(97)
Segment Assets	11,548		11,548		11,551
Insurance [Member]
Segment Reporting Information [Line Items]
Net Interest Income	5	10	12	17
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	1,367	1,343	3,129	2,706
Noncash Items:
Provision for Loan Losses	0	0	0	0
Depreciation and Amortization	106	105	211	210
Income Tax Expense (Benefit)	40	66	187	106
Segment Profit (Loss)	27	89	238	145
Segment Assets	8,395		8,395		8,333
Other [Member]
Segment Reporting Information [Line Items]
Net Interest Income	(303)	(531)	(854)	(1,070)
Net Gains on Sales of Loans	0	0	0	0
Net Gains on Securities	0	0	0	0
Trust and Investment Product Fees	0	(1)	(1)	(2)
Insurance Revenues	0	0	0	0
Noncash Items:
Provision for Loan Losses	0	0	0	0
Depreciation and Amortization	38	38	75	75
Income Tax Expense (Benefit)	(413)	(335)	(788)	(674)
Segment Profit (Loss)	(287)	(329)	(529)	(638)
Segment Assets	$ (28,560)		$ (28,560)		$ (20,576)