Fair Value (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Unpaid Principal Balance	$ 2,678	$ 2,665
Consumer [Member]
Unpaid Principal Balance	44	45
Commercial Real Estate [Member]
Unpaid Principal Balance	2,634	2,620
Fair Value, Inputs, Level 3 [Member]
Unpaid Principal Balance	2,678	2,665
Fair Value, Inputs, Level 3 [Member] | Consumer [Member]
Unpaid Principal Balance	44	45
Sales comparison approach/ Contractual provision of USDA loan Sales comparison approach	Sales comparison approach	Sales comparison approach
Fair Value Measurements Unobservable Inputs	Adjustment for differences between comparable sales	Adjustment for differences between comparable sales
Other Residential Real Estate Owned Loan Interest Rate	10.00%	10.00%
Fair Value, Inputs, Level 3 [Member] | Commercial Real Estate [Member]
Unpaid Principal Balance	$ 2,634	$ 2,620
Sales comparison approach/ Contractual provision of USDA loan Sales comparison approach	Sales comparison approach/ Contractual provision of USDA loan	Sales comparison approach/ Contractual provision of USDA loan
Fair Value Measurements Unobservable Inputs	Adjustment for differences between comparable sales	Adjustment for differences between comparable sales
Impaired Commercial Real Estate Loan Minimum Interest Rate In Range	10.00%	10.00%
Impaired Commercial Real Estate Loan Maximum Interest Rate In Range	25.00%	25.00%