Allowance For Loan Losses (Schedule Of Aging Analysis Of Accruing And Non-Accruing Loans) (Details) (USD $)	Jun. 30, 2012		Dec. 31, 2011
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	$ 10,181,000	[1]	$ 9,653,000
60 - 89 days past due	2,595,000	[1]	3,494,000
Over 90 days past due	1,782,000	[1]	166,000
Non-accrual	21,726,000		21,951,000
Financing receivable recorded investment past due total	36,284,000		35,264,000
Current	2,029,305,000		1,937,839,000
Total	2,065,589,000		1,973,103,000
Estimated cash flows of loan, 30-59 day category	200,000
Estimated cash flows of loan, 60-89 day category	1,100,000
Estimated cash flows of loan, over 90 day category	1,600,000
Commercial And Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	540,000	[1]	1,243,000
Non-accrual	341,000		375,000
Financing receivable recorded investment past due total	881,000		1,618,000
Current	115,407,000		129,281,000
Total	116,288,000		130,899,000
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	3,315,000	[1]	576,000
60 - 89 days past due	1,183,000	[1]	2,839,000
Over 90 days past due	1,627,000	[1]
Non-accrual	18,422,000		18,930,000
Financing receivable recorded investment past due total	24,547,000		22,345,000
Current	743,629,000		709,801,000
Total	768,176,000		732,146,000
Residential Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	4,247,000	[1]	4,912,000
60 - 89 days past due	1,222,000	[1]	408,000
Over 90 days past due	106,000	[1]	42,000
Non-accrual	2,078,000		957,000
Financing receivable recorded investment past due total	7,653,000		6,319,000
Current	686,865,000		632,266,000
Total	694,518,000		638,585,000
Home equity - junior liens (including lines of credit) [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	1,668,000	[1]	1,906,000
60 - 89 days past due	166,000	[1]	228,000
Over 90 days past due	30,000	[1]	112,000
Non-accrual	885,000		1,689,000
Financing receivable recorded investment past due total	2,749,000		3,935,000
Current	443,149,000		429,065,000
Total	445,898,000		433,000,000
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	59,000	[1]	133,000
60 - 89 days past due	15,000	[1]	5,000
Over 90 days past due	16,000	[1]
Financing receivable recorded investment past due total	90,000		138,000
Current	37,293,000		35,707,000
Total	37,383,000		35,845,000
DDA Overdrafts [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	352,000	[1]	883,000
60 - 89 days past due	9,000	[1]	14,000
Over 90 days past due	3,000	[1]	12,000
Financing receivable recorded investment past due total	364,000		909,000
Current	2,962,000		1,719,000
Total	$ 3,326,000		$ 2,628,000

[1] A loan acquired and accounted for under ASC Topic 310-30, in which the Company can reasonably estimate the cash flows of the loan, is reported as an accruing loan and a performing asset. Included in the 30-59 day, 60-89 day and over 90 day categories above are $0.2 million, $1.1 million and $1.6 million, respectively, of such loans at June 30, 2012.