Allowance For Loan Losses (Schedule Of Credit Quality Indicators) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Financing Receivable, Recorded Investment [Line Items]
Total	$ 2,065,589	$ 1,973,103
Commercial, Industrial, And Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	884,464	863,045
Commercial And Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	116,288	130,899
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	768,176	732,146
Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	694,518	638,585
Home equity - junior liens (including lines of credit) [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	445,898	433,000
Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	37,383	35,845
DDA Overdrafts [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	3,326	2,628
Exceptional [Member] | Commercial, Industrial, And Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	5,189	4,262
Exceptional [Member] | Commercial And Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	3,364	4,220
Exceptional [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	1,825	42
Good [Member] | Commercial, Industrial, And Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	110,242	114,446
Good [Member] | Commercial And Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	6,209	6,728
Good [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	104,033	107,718
Acceptable [Member] | Commercial, Industrial, And Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	505,676	504,798
Acceptable [Member] | Commercial And Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	69,666	93,077
Acceptable [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	436,010	411,721
Pass/Watch [Member] | Commercial, Industrial, And Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	207,841	186,844
Pass/Watch [Member] | Commercial And Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	34,031	25,246
Pass/Watch [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	173,810	161,598
Special Mention [Member] | Commercial, Industrial, And Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	16,373	17,272
Special Mention [Member] | Commercial And Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	1,036	470
Special Mention [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	15,337	16,802
Substandard [Member] | Commercial, Industrial, And Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	38,915	35,302
Substandard [Member] | Commercial And Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	1,982	1,037
Substandard [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	36,933	34,265
Doubtful [Member] | Commercial, Industrial, And Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	228	121
Doubtful [Member] | Commercial And Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total		121
Doubtful [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	228
Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	1,178,007	1,107,246
Performing [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	692,334	637,586
Performing [Member] | Home equity - junior liens (including lines of credit) [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	444,983	431,199
Performing [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	37,367	35,845
Performing [Member] | DDA Overdrafts [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	3,323	2,616
Non-Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	3,118	2,812
Non-Performing [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	2,184	999
Non-Performing [Member] | Home equity - junior liens (including lines of credit) [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	915	1,801
Non-Performing [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	16
Non-Performing [Member] | DDA Overdrafts [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	$ 3	$ 12