Loans Past Due Loans (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, Current	$ 442,502	$ 407,759
Loans, 30 to 89 Days	3,122	10,355
Loans, 90 Days and Over and Accruing	269	1,897
Loans, Nonaccrual	3,284	4,308
Loans	449,177	424,319
Residential Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, Current	145,506	140,330
Loans, 30 to 89 Days	1,085	3,819
Loans, 90 Days and Over and Accruing	194	606
Loans, Nonaccrual	2,753	2,671
Loans	149,538	147,426
Construction Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, Current	33,010	26,849
Loans, 30 to 89 Days	1,400	961
Loans, 90 Days and Over and Accruing	70	175
Loans, Nonaccrual	0	92
Loans	34,480	28,077
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, Current	183,297	182,122
Loans, 30 to 89 Days	389	5,165
Loans, 90 Days and Over and Accruing	0	1,104
Loans, Nonaccrual	418	1,379
Loans	184,104	189,770
Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, Current	21,435	22,519
Loans, 30 to 89 Days	179	376
Loans, 90 Days and Over and Accruing	0	12
Loans, Nonaccrual	112	111
Loans	21,726	23,018
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, Current	6,144	6,045
Loans, 30 to 89 Days	69	34
Loans, 90 Days and Over and Accruing	5	0
Loans, Nonaccrual	1	55
Loans	6,219	6,134
Tax Exempt [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, Current	53,110	29,894
Loans, 30 to 89 Days	0	0
Loans, 90 Days and Over and Accruing	0	0
Loans, Nonaccrual	0	0
Loans	$ 53,110	$ 29,894