Loans and Allowance for Loan Losses (Summary of Impaired Loan Balances and Associated Allowance by Portfolio Segment) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Financing Receivable, Impaired [Line Items]
Recorded investment with related allowance recorded	$ 19,781	$ 21,854
Unpaid principal balance with related allowance recorded	19,781	22,424
Related allowance with related allowance recorded	3,106	3,671
Average recorded investment with related allowance recorded	21,591	24,063
Interest income recognized with related allowance recorded	114	120
Recorded investment without related allowance recorded	7,376	5,532
Unpaid principal balance without related allowance recorded	9,476	7,655
Related allowance without related allowance recorded
Average recorded investment without related allowance recorded	5,616	4,758
Interest income recognized without related allowance recorded	72	21
Recorded investment, total impaired loans	27,157	27,386
Unpaid principal balance, total impaired loans	29,257	30,079
Related allowance, total impaired loans	3,106	3,671
Average recorded investment, , total impaired loans	27,207	28,821
Interest income recognized, total impaired loans	186	141
Residential real estate loans
Financing Receivable, Impaired [Line Items]
Recorded investment with related allowance recorded	11,021	10,717
Unpaid principal balance with related allowance recorded	11,021	11,287
Related allowance with related allowance recorded	2,255	1,364
Average recorded investment with related allowance recorded	10,585	11,280
Interest income recognized with related allowance recorded	114	109
Recorded investment without related allowance recorded	2,784	1,998
Unpaid principal balance without related allowance recorded	3,841	1,810
Related allowance without related allowance recorded
Average recorded investment without related allowance recorded	2,548	1,847
Interest income recognized without related allowance recorded	26	21
Related allowance, total impaired loans	2,255	1,364
Commercial real estate loans
Financing Receivable, Impaired [Line Items]
Recorded investment with related allowance recorded	4,296	5,477
Unpaid principal balance with related allowance recorded	4,296	5,478
Related allowance with related allowance recorded	265	961
Average recorded investment with related allowance recorded	5,551	7,257
Interest income recognized with related allowance recorded		3
Recorded investment without related allowance recorded	3,672	2,353
Unpaid principal balance without related allowance recorded	4,127	3,815
Related allowance without related allowance recorded
Average recorded investment without related allowance recorded	2,056	2,078
Interest income recognized without related allowance recorded	33
Related allowance, total impaired loans	265	961
Commercial loans
Financing Receivable, Impaired [Line Items]
Recorded investment with related allowance recorded	2,971	3,636
Unpaid principal balance with related allowance recorded	2,971	3,636
Related allowance with related allowance recorded	286	815
Average recorded investment with related allowance recorded	3,927	3,963
Interest income recognized with related allowance recorded		7
Recorded investment without related allowance recorded	639	383
Unpaid principal balance without related allowance recorded	956	665
Related allowance without related allowance recorded
Average recorded investment without related allowance recorded	389	393
Interest income recognized without related allowance recorded	13
Related allowance, total impaired loans	286	815
Home equity loans
Financing Receivable, Impaired [Line Items]
Recorded investment with related allowance recorded	1,236	1,888
Unpaid principal balance with related allowance recorded	1,236	1,887
Related allowance with related allowance recorded	261	440
Average recorded investment with related allowance recorded	1,289	1,457
Interest income recognized with related allowance recorded		1
Recorded investment without related allowance recorded	279	782
Unpaid principal balance without related allowance recorded	550	1,189
Related allowance without related allowance recorded
Average recorded investment without related allowance recorded	617	422
Interest income recognized without related allowance recorded
Related allowance, total impaired loans	261	440
Consumer loans
Financing Receivable, Impaired [Line Items]
Recorded investment with related allowance recorded	257	136
Unpaid principal balance with related allowance recorded	257	136
Related allowance with related allowance recorded	39	91
Average recorded investment with related allowance recorded	239	106
Interest income recognized with related allowance recorded
Recorded investment without related allowance recorded	2	16
Unpaid principal balance without related allowance recorded	2	176
Related allowance without related allowance recorded
Average recorded investment without related allowance recorded	6	18
Interest income recognized without related allowance recorded
Related allowance, total impaired loans	$ 39	$ 91