Allowance For Loan Losses (Schedule Of Credit Quality Indicators) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Financing Receivable, Recorded Investment [Line Items]
Total	$ 2,085,232	$ 1,973,103
Commercial, Industrial, And Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	892,914	863,045
Commercial And Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	105,027	130,899
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	787,887	732,146
Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	1,008,305	929,788
Home equity - junior liens (including lines of credit) [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	143,058	141,797
Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	38,285	35,845
DDA Overdrafts [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	2,670	2,628
Exceptional [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	5,321	4,262
Exceptional [Member] | Commercial And Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	3,508	4,220
Exceptional [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	1,813	42
Good [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	104,697	114,446
Good [Member] | Commercial And Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	6,466	6,728
Good [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	98,231	107,718
Acceptable [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	524,620	504,798
Acceptable [Member] | Commercial And Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	68,504	93,077
Acceptable [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	456,116	411,721
Pass/Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	201,294	186,844
Pass/Watch [Member] | Commercial And Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	23,320	25,246
Pass/Watch [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	177,974	161,598
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	16,897	17,272
Special Mention [Member] | Commercial And Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	1,066	470
Special Mention [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	15,831	16,802
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	40,085	35,302
Substandard [Member] | Commercial And Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	2,163	1,037
Substandard [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	37,922	34,265
Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total		121
Doubtful [Member] | Commercial And Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total		121
Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	1,188,412	1,107,246
Performing [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	1,005,522	928,789
Performing [Member] | Home equity - junior liens (including lines of credit) [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	141,950	139,996
Performing [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	38,274	35,845
Performing [Member] | DDA Overdrafts [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	2,666	2,616
Non-Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	3,906	2,812
Non-Performing [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	2,783	999
Non-Performing [Member] | Home equity - junior liens (including lines of credit) [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	1,108	1,801
Non-Performing [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	11
Non-Performing [Member] | DDA Overdrafts [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	$ 4	$ 12