Fair Value Measurement (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Significant Unobservable Inputs (Level 3) [Member] | Impaired Loans [Member]
Assets measured at fair value
Assets	$ 25,506
Significant Unobservable Inputs (Level 3) [Member] | Other real estate owned [Member]
Assets measured at fair value
Assets	464
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	52,863	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	79,210	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	77,339	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	456
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Obligations of states and political subdivisions [Member]
Assets measured at fair value
Assets	476	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	25,506	22,569
Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Other real estate owned [Member]
Assets measured at fair value
Assets	$ 464	$ 1,097