Disclosures about Fair Value of Assets and Liabilities (Details 2) (Fair Value, Measurements, Nonrecurring [Member], USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Fair value measurements of assets on a nonrecurring basis
Impaired loans	$ 7,936	$ 7,407
Other real estate owned		1,165
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair value measurements of assets on a nonrecurring basis
Impaired loans
Other real estate owned
Significant Other Observable Inputs (Level 2) [Member]
Fair value measurements of assets on a nonrecurring basis
Impaired loans
Other real estate owned
Significant Unobservable Inputs (Level 3) [Member]
Fair value measurements of assets on a nonrecurring basis
Impaired loans	7,936	7,407
Other real estate owned		$ 1,165