Fair Value Measurements (Details) (Fair Value measured on a Recurring Basis, USD $)	Jun. 30, 2012	Dec. 31, 2011
Fair value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
U.S. government agencies	$ 755	$ 1,584
Mortgage-backed securities of government sponsored entities	100,285	101,328
Private-label collateralized mortgage obligations	1,340	1,741
State and political subdivisions	27,139	25,984
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
U.S. government agencies
Mortgage-backed securities of government sponsored entities
Private-label collateralized mortgage obligations
State and political subdivisions
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
U.S. government agencies	755	1,584
Mortgage-backed securities of government sponsored entities	100,285	101,328
Private-label collateralized mortgage obligations	1,340	1,741
State and political subdivisions	27,139	25,984
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
U.S. government agencies
Mortgage-backed securities of government sponsored entities
Private-label collateralized mortgage obligations
State and political subdivisions