Allowance For Credit Losses (Impaired Loans by Loan Portfolio) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	$ 7,146		$ 5,432
Unpaid Principal Balance, With no related allowance recorded	7,685		5,955
Average Recorded Investment, With no related allowance recorded	5,006	3,980
Recorded Investment, With allowance recorded	8,496		6,891
Unpaid Principal Balance, With allowance recorded	9,077		7,433
Related Allowance	1,733		1,015
Average Recorded Investment, With allowance recorded	7,694	3,475
Recorded Investment, Total	15,642		12,323
Unpaid Principal Balance, Total	16,762		13,388
Average Recorded Investment, Total	12,700	7,455
Residential mortgage [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	2,384		2,386
Unpaid Principal Balance, With no related allowance recorded	2,881		2,883
Average Recorded Investment, With no related allowance recorded	2,385	2,005
Recorded Investment, With allowance recorded	318
Unpaid Principal Balance, With allowance recorded	318
Related Allowance	51
Average Recorded Investment, With allowance recorded	159
Recorded Investment, Total	2,702		2,386
Unpaid Principal Balance, Total	3,199		2,883
Average Recorded Investment, Total	2,544	2,005
Commercial mortgage [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	2,346		2,807
Unpaid Principal Balance, With no related allowance recorded	2,353		2,814
Average Recorded Investment, With no related allowance recorded	1,293	104
Recorded Investment, With allowance recorded	3,652		2,565
Unpaid Principal Balance, With allowance recorded	3,695		2,569
Related Allowance	245		151
Average Recorded Investment, With allowance recorded	3,109	1,099
Recorded Investment, Total	5,998		5,372
Unpaid Principal Balance, Total	6,048		5,383
Average Recorded Investment, Total	4,402	1,203
Commercial term [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance, With no related allowance recorded	3		3
Average Recorded Investment, With no related allowance recorded		201
Recorded Investment, With allowance recorded	200
Unpaid Principal Balance, With allowance recorded	200
Related Allowance	200
Average Recorded Investment, With allowance recorded	100
Recorded Investment, Total	200
Unpaid Principal Balance, Total	203		3
Average Recorded Investment, Total	100	201
Commercial construction [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	2,181
Unpaid Principal Balance, With no related allowance recorded	2,196
Average Recorded Investment, With no related allowance recorded	1,091	1,459
Recorded Investment, With allowance recorded	4,326		4,326
Unpaid Principal Balance, With allowance recorded	4,864		4,864
Related Allowance	1,237		864
Average Recorded Investment, With allowance recorded	4,326	2,376
Recorded Investment, Total	6,507		4,326
Unpaid Principal Balance, Total	7,060		4,864
Average Recorded Investment, Total	5,417	3,835
Lease financing [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	26		28
Unpaid Principal Balance, With no related allowance recorded	35		36
Average Recorded Investment, With no related allowance recorded	27	61
Recorded Investment, Total	26		28
Unpaid Principal Balance, Total	35		36
Average Recorded Investment, Total	27	61
Consumer [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	209		211
Unpaid Principal Balance, With no related allowance recorded	217		219
Average Recorded Investment, With no related allowance recorded	210	150
Recorded Investment, Total	209		211
Unpaid Principal Balance, Total	217		219
Average Recorded Investment, Total	$ 210	$ 150