Loans (Recorded Investment By Loan Class In Current And Nonaccrual Loans) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	$ 2,575	$ 3,330
60-89 Days Past Due	200	208
Greater Than 90 Days	5	18
Total Past Due	2,780	3,556
Nonaccrual	11,761	9,107
Current	1,672,010	1,662,790
Total loans	1,686,551	1,675,453	1,494,579
Commercial Business [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	208	160
Total Past Due	208	160
Nonaccrual	5,616	3,413
Current	253,230	255,133
Total loans	259,054	258,706	233,690
Commercial Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	523	331
Total Past Due	523	331
Nonaccrual	2,767	1,799
Current	422,296	412,152
Total loans	425,586	414,282	407,293
Residential Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	293	376
Total Past Due	293	376
Nonaccrual	1,759	2,040
Current	124,006	130,925
Total loans	126,058	133,341	112,096
Home Equity [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	388	675
60-89 Days Past Due	86	10
Total Past Due	474	685
Nonaccrual	598	939
Current	286,772	280,879
Total loans	287,844	282,503	232,928
Consumer Indirect [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	1,084	1,661
60-89 Days Past Due	95	163
Total Past Due	1,179	1,824
Nonaccrual	1,007	891
Current	561,242	557,249
Total loans	563,428	559,964	485,244
Other Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	79	127
60-89 Days Past Due	19	35
Greater Than 90 Days	5	18
Total Past Due	103	180
Nonaccrual	14	25
Current	24,464	26,452
Total loans	$ 24,581	$ 26,657	$ 23,328