Loan Quality (Impaired Financing Receivables) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Allowance	$ 33,578		$ 35,593
Unpaid Principal Balance With No Allowance	37,417		39,510
Recorded Investment With Allowance	5,600		3,771
Unpaid Principal Balance With Allowance	6,425		4,419
Related Allowance	1,148		847
Average Recorded Investment	39,491	34,117
Interest Income Recognized	43	137
Residential Real Estate First Liens [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Allowance	3,163		3,504
Unpaid Principal Balance With No Allowance	3,216		3,715
Recorded Investment With Allowance	444		80
Unpaid Principal Balance With Allowance	607		80
Related Allowance	59		20
Average Recorded Investment	3,626	4,600
Interest Income Recognized	4	43
Residential Real Estate Junior Liens & Lines of Credit [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Allowance	737		691
Unpaid Principal Balance With No Allowance	756		707
Average Recorded Investment	742	817
Interest Income Recognized	1	1
Residential Real Estate 1-4 Family [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Allowance	3,900		4,195
Unpaid Principal Balance With No Allowance	3,972		4,422
Recorded Investment With Allowance	444		80
Unpaid Principal Balance With Allowance	607		80
Related Allowance	59		20
Average Recorded Investment	4,368	5,417
Interest Income Recognized	5	44
Residential Real Estate - Construction [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Allowance	554		557
Unpaid Principal Balance With No Allowance	566		567
Average Recorded Investment	556	9
Commercial, industrial and agricultural real estate [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Allowance	28,719		28,346
Unpaid Principal Balance With No Allowance	32,474		31,937
Recorded Investment With Allowance	2,762		2,603
Unpaid Principal Balance With Allowance	3,367		3,194
Related Allowance	354		357
Average Recorded Investment	30,087	24,376
Interest Income Recognized	3	57
Commercial, industrial and agricultural [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Allowance	405		2,495
Unpaid Principal Balance With No Allowance	405		2,584
Recorded Investment With Allowance	2,394		1,088
Unpaid Principal Balance With Allowance	2,451		1,145
Related Allowance	735		470
Average Recorded Investment	4,480	4,315
Interest Income Recognized		36
Consumer [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Allowance
Unpaid Principal Balance With No Allowance
Recorded Investment With Allowance
Unpaid Principal Balance With Allowance
Related Allowance
Average Recorded Investment
Interest Income Recognized