Fair Value (Assets measured at fair value on nonrecurring basis) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2012	Dec. 31, 2011
Impaired loans [Member]
Assets carried on the consolidated statements for which a nonrecurring change in fair value has been recorded
Assets measured on non-recurring basis	$ 166	$ 206
Total fair value gain (loss)	(190)	(308)
Other real estate owned ("OREO") [Member]
Assets carried on the consolidated statements for which a nonrecurring change in fair value has been recorded
Assets measured on non-recurring basis	1,333	1,284
Total fair value gain (loss)	(26)
Fair Value on a Nonrecurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Impaired loans [Member]
Assets carried on the consolidated statements for which a nonrecurring change in fair value has been recorded
Assets measured on non-recurring basis
Fair Value on a Nonrecurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Other real estate owned ("OREO") [Member]
Assets carried on the consolidated statements for which a nonrecurring change in fair value has been recorded
Assets measured on non-recurring basis
Fair Value on a Nonrecurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Impaired loans [Member]
Assets carried on the consolidated statements for which a nonrecurring change in fair value has been recorded
Assets measured on non-recurring basis
Fair Value on a Nonrecurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Other real estate owned ("OREO") [Member]
Assets carried on the consolidated statements for which a nonrecurring change in fair value has been recorded
Assets measured on non-recurring basis
Fair Value on a Nonrecurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Impaired loans [Member]
Assets carried on the consolidated statements for which a nonrecurring change in fair value has been recorded
Assets measured on non-recurring basis	166	206
Fair Value on a Nonrecurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Other real estate owned ("OREO") [Member]
Assets carried on the consolidated statements for which a nonrecurring change in fair value has been recorded
Assets measured on non-recurring basis	$ 1,333	$ 1,284