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Fair Value of Instruments (Details 2) (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2012	Dec. 31, 2011
Impaired loans and other real estate
Change in fair value of assets and liabilities	$ (346)	$ (928)
Fair Value, Measurements, Nonrecurring [Member] \| Impaired loans [Member]
Impaired loans and other real estate
Assets measured at fair value on a nonrecurring basis, total	4,354	1,854
Change in fair value of assets and liabilities	(139)	(150)
Fair Value, Measurements, Nonrecurring [Member] \| Other real estate owned - residential mortgages [Member]
Impaired loans and other real estate
Assets measured at fair value on a nonrecurring basis, total	900	958
Change in fair value of assets and liabilities	(50)	(145)
Fair Value, Measurements, Nonrecurring [Member] \| Other real estate owned - commercial [Member]
Impaired loans and other real estate
Assets measured at fair value on a nonrecurring basis, total	2,414	2,614
Change in fair value of assets and liabilities	(157)	(633)
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Fair Value, Measurements, Nonrecurring [Member] \| Impaired loans [Member]
Impaired loans and other real estate
Assets measured at fair value
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Fair Value, Measurements, Nonrecurring [Member] \| Other real estate owned - residential mortgages [Member]
Impaired loans and other real estate
Assets measured at fair value
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Fair Value, Measurements, Nonrecurring [Member] \| Other real estate owned - commercial [Member]
Impaired loans and other real estate
Assets measured at fair value
Significant Observable Inputs (Level 2) [Member] \| Fair Value, Measurements, Nonrecurring [Member] \| Impaired loans [Member]
Impaired loans and other real estate
Assets measured at fair value
Significant Observable Inputs (Level 2) [Member] \| Fair Value, Measurements, Nonrecurring [Member] \| Other real estate owned - residential mortgages [Member]
Impaired loans and other real estate
Assets measured at fair value
Significant Observable Inputs (Level 2) [Member] \| Fair Value, Measurements, Nonrecurring [Member] \| Other real estate owned - commercial [Member]
Impaired loans and other real estate
Assets measured at fair value
Significant Unobservable Inputs (Level 3) [Member] \| Fair Value, Measurements, Nonrecurring [Member] \| Impaired loans [Member]
Impaired loans and other real estate
Assets measured at fair value	4,354	1,854
Significant Unobservable Inputs (Level 3) [Member] \| Fair Value, Measurements, Nonrecurring [Member] \| Other real estate owned - residential mortgages [Member]
Impaired loans and other real estate
Assets measured at fair value	900	958
Significant Unobservable Inputs (Level 3) [Member] \| Fair Value, Measurements, Nonrecurring [Member] \| Other real estate owned - commercial [Member]
Impaired loans and other real estate
Assets measured at fair value	$ 2,414	$ 2,614