Fair Value Measurement (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Significant Unobservable Inputs (Level 3) [Member] | Impaired Loans [Member]
Assets measured at fair value
Assets	$ 20,400
Significant Unobservable Inputs (Level 3) [Member] | Other real estate owned [Member]
Assets measured at fair value
Assets	494
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | U.S. Treasury securities and obligations of U.S. government agencies [Member]
Assets measured at fair value
Assets
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Obligations of states and political subdivisions [Member]
Assets measured at fair value
Assets
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Mortgage-backed securities in government sponsored entities [Member]
Assets measured at fair value
Assets
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity securities in financial institutions [Member]
Assets measured at fair value
Assets		676
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | U.S. Treasury securities and obligations of U.S. government agencies [Member]
Assets measured at fair value
Assets	49,480	49,704
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Obligations of states and political subdivisions [Member]
Assets measured at fair value
Assets	75,370	66,219
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Mortgage-backed securities in government sponsored entities [Member]
Assets measured at fair value
Assets	85,470	87,518
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Equity securities in financial institutions [Member]
Assets measured at fair value
Assets	419
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Obligations of states and political subdivisions [Member]
Assets measured at fair value
Assets	485	517
Fair Value, Measurements, Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Impaired Loans [Member]
Assets measured at fair value
Assets
Fair Value, Measurements, Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Other real estate owned [Member]
Assets measured at fair value
Assets
Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Impaired Loans [Member]
Assets measured at fair value
Assets	20,400	22,569
Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Other real estate owned [Member]
Assets measured at fair value
Assets	$ 494	$ 1,097