Fair Value of Financial Instruments (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Impaired loans and other real estate
Change in fair value of assets and liabilities	$ (352)	$ (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	4,591	1,854
Change in fair value of assets and liabilities	(76)	(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	783	958
Change in fair value of assets and liabilities	(62)	(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	1,526	2,614
Change in fair value of assets and liabilities	(214)	(633)
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Fair Value, Measurements, Nonrecurring [Member]
Impaired loans and other real estate
Assets measured at fair value on a nonrecurring basis, total
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 on a nonrecurring basis, total
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 on a nonrecurring basis, total
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 on a nonrecurring basis, total
Significant Observable Inputs (Level 2) [Member] \| Fair Value, Measurements, Nonrecurring [Member]
Impaired loans and other real estate
Assets measured at fair value on a nonrecurring basis, total
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 on a nonrecurring basis, total
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 on a nonrecurring basis, total
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 on a nonrecurring basis, total
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 on a nonrecurring basis, total	4,591	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 on a nonrecurring basis, total	783	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 on a nonrecurring basis, total	$ 1,526	$ 2,614