Allowance For Credit Losses (Impaired Loans by Loan Portfolio) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended	12 Months Ended
Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	$ 5,186		$ 5,186	$ 3,142
Recorded Investment, With allowance recorded	2,112		2,112	4,992
Related Allowance, With allowance recorded	849	1,185	849	355	1,185
Recorded Investment, Total	7,298	7,574	7,298	8,134	7,574
Unpaid Principal Balance, Total	8,692	8,788	8,692		8,788
Related Allowance, Total	849	1,185	849	355	1,185
Average Recorded Investment, Total	8,222	7,780	7,838	7,301	7,356
Interest Income Recognized, Total	157		213	59	59
Residential mortgage [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	2,390	2,014	2,390		2,014
Unpaid Principal Balance, With no related allowance recorded	2,887	2,413	2,887		2,413
Average Recorded Investment, With no related allowance recorded	2,409	1,262	2,207		1,095
Average Recorded Investment, With allowance recorded		755			959
Recorded Investment, Total	2,390	2,014	2,390		2,014
Unpaid Principal Balance, Total	2,887	2,413	2,887		2,413
Average Recorded Investment, Total	2,409	2,017	2,207		2,054
Commercial mortgage [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	240		240
Unpaid Principal Balance, With no related allowance recorded	247		247
Average Recorded Investment, With no related allowance recorded	240	1,019	171		821
Interest Income Recognized, With no related allowance recorded			1		58
Recorded Investment, With allowance recorded	81	2,114	81		2,114
Unpaid Principal Balance, With allowance recorded	84	2,116	84		2,116
Related Allowance, With allowance recorded	43	826	43		826
Average Recorded Investment, With allowance recorded	82	1,057	590		444
Recorded Investment, Total	321	2,114	321		2,114
Unpaid Principal Balance, Total	331	2,116	331		2,116
Related Allowance, Total	43	826	43		826
Average Recorded Investment, Total	322	2,076	761		1,265
Interest Income Recognized, Total			1		58
Commercial term [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	65	202	65		202
Unpaid Principal Balance, With no related allowance recorded	399	566	399		566
Average Recorded Investment, With no related allowance recorded	76	217	139		206
Interest Income Recognized, With no related allowance recorded			12		1
Average Recorded Investment, With allowance recorded		192			450
Recorded Investment, Total	65	202	65		202
Unpaid Principal Balance, Total	399	566	399		566
Average Recorded Investment, Total	76	409	139		656
Interest Income Recognized, Total			12		1
Commercial construction [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	2,295	312	2,295		312
Unpaid Principal Balance, With no related allowance recorded	2,833	634	2,833		634
Average Recorded Investment, With no related allowance recorded	3,177	156	2,318		339
Interest Income Recognized, With no related allowance recorded	130		130
Recorded Investment, With allowance recorded	2,031	2,720	2,031		2,720
Unpaid Principal Balance, With allowance recorded	2,031	2,833	2,031		2,833
Related Allowance, With allowance recorded	806	359	806		359
Average Recorded Investment, With allowance recorded	2,031	2,952	2,203		2,813
Interest Income Recognized, With allowance recorded	27		66
Recorded Investment, Total	4,326	3,032	4,326		3,032
Unpaid Principal Balance, Total	4,864	3,467	4,864		3,467
Related Allowance, Total	806	359	806		359
Average Recorded Investment, Total	5,208	3,108	4,521		3,152
Interest Income Recognized, Total	157		196
Leases financing [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	33	61	33		61
Unpaid Principal Balance, With no related allowance recorded	47	74	47		74
Average Recorded Investment, With no related allowance recorded	46	63	54		123
Average Recorded Investment, With allowance recorded					27
Recorded Investment, Total	33	61	33		61
Unpaid Principal Balance, Total	47	74	47		74
Average Recorded Investment, Total	46	63	54		150
Consumer [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	163	151	163		151
Unpaid Principal Balance, With no related allowance recorded	164	152	164		152
Average Recorded Investment, With no related allowance recorded	161	107	156		79
Interest Income Recognized, With no related allowance recorded			4
Recorded Investment, Total	163	151	163		151
Unpaid Principal Balance, Total	164	152	164		152
Average Recorded Investment, Total	161	107	156		79
Interest Income Recognized, Total			$ 4

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Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5212-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 17

-URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5258-111524

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 14A

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953550-111524

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