Allowance For Loan Losses (Schedule Of Aging Analysis Of Accruing And Non-Accruing Loans) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	$ 8,417	$ 9,653
60 - 89 days past due	489	3,494
Over 90 days past due	397	166
Non-accrual	22,586	21,951
Financing receivable recorded investment past due total	31,889	35,264
Current	2,053,343	1,937,839
Total	2,085,232	1,973,103
Commercial And Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	25	1,243
Non-accrual	1,426	375
Financing receivable recorded investment past due total	1,451	1,618
Current	103,576	129,281
Total	105,027	130,899
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	1,168	576
60 - 89 days past due	102	2,839
Over 90 days past due	1
Non-accrual	17,650	18,930
Financing receivable recorded investment past due total	18,921	22,345
Current	768,966	709,801
Total	787,887	732,146
Residential Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	4,332	4,912
60 - 89 days past due	231	408
Over 90 days past due	346	42
Non-accrual	2,437	957
Financing receivable recorded investment past due total	7,346	6,319
Current	1,000,959	923,469
Total	1,008,305	929,788
Home equity - junior liens (including lines of credit) [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	2,473	1,906
60 - 89 days past due	135	228
Over 90 days past due	35	112
Non-accrual	1,073	1,689
Financing receivable recorded investment past due total	3,716	3,935
Current	139,342	137,862
Total	143,058	141,797
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	110	133
60 - 89 days past due	15	5
Over 90 days past due	11
Financing receivable recorded investment past due total	136	138
Current	38,149	35,707
Total	38,285	35,845
DDA Overdrafts [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	309	883
60 - 89 days past due	6	14
Over 90 days past due	4	12
Financing receivable recorded investment past due total	319	909
Current	2,351	1,719
Total	$ 2,670	$ 2,628