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Fair Value Measurements (Details 1) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Impaired collateral-dependent loans which are measured at fair value on a nonrecurring basis:    
Foreclosed real estate,Fair value $ 10,938 $ 7,646
Nonrecurring Basis
    
Impaired collateral-dependent loans which are measured at fair value on a nonrecurring basis:    
Total Losses 3,680 4,716
Losses Recorded in Operations 366 1,300
Foreclosed real estate, Losses 102 772
Foreclosed real estate, Losses Recorded in Operations 102 772
Nonrecurring Basis | Residential real estate
    
Impaired collateral-dependent loans which are measured at fair value on a nonrecurring basis:    
Total Losses   545
Losses Recorded in Operations   308
Nonrecurring Basis | Commercial Real Estate
    
Impaired collateral-dependent loans which are measured at fair value on a nonrecurring basis:    
Total Losses 2,780 2,660
Losses Recorded in Operations 366 158
Nonrecurring Basis | Land and construction
    
Impaired collateral-dependent loans which are measured at fair value on a nonrecurring basis:    
Total Losses 449 1,511
Losses Recorded in Operations    834
Nonrecurring Basis | Residential real estate - Closed-end first mortgages
    
Impaired collateral-dependent loans which are measured at fair value on a nonrecurring basis:    
Total Losses 451  
Losses Recorded in Operations     
Nonrecurring Basis | Fair Value
    
Impaired collateral-dependent loans which are measured at fair value on a nonrecurring basis:    
Impaired collateral-dependent loans, Fair value 8,366 15,215
Foreclosed real estate,Fair value 10,938 7,646
Nonrecurring Basis | Fair Value | Residential real estate
    
Impaired collateral-dependent loans which are measured at fair value on a nonrecurring basis:    
Impaired collateral-dependent loans, Fair value 1,247 1,591
Nonrecurring Basis | Fair Value | Commercial Real Estate
    
Impaired collateral-dependent loans which are measured at fair value on a nonrecurring basis:    
Impaired collateral-dependent loans, Fair value 6,232 6,831
Nonrecurring Basis | Fair Value | Land and construction
    
Impaired collateral-dependent loans which are measured at fair value on a nonrecurring basis:    
Impaired collateral-dependent loans, Fair value 887 6,793
Nonrecurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1)
    
Impaired collateral-dependent loans which are measured at fair value on a nonrecurring basis:    
Impaired collateral-dependent loans, Fair value      
Foreclosed real estate,Fair value      
Nonrecurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Residential real estate
    
Impaired collateral-dependent loans which are measured at fair value on a nonrecurring basis:    
Impaired collateral-dependent loans, Fair value      
Nonrecurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial Real Estate
    
Impaired collateral-dependent loans which are measured at fair value on a nonrecurring basis:    
Impaired collateral-dependent loans, Fair value      
Nonrecurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Land and construction
    
Impaired collateral-dependent loans which are measured at fair value on a nonrecurring basis:    
Impaired collateral-dependent loans, Fair value      
Nonrecurring Basis | Significant Other Observable Inputs (Level 2)
    
Impaired collateral-dependent loans which are measured at fair value on a nonrecurring basis:    
Impaired collateral-dependent loans, Fair value      
Foreclosed real estate,Fair value      
Nonrecurring Basis | Significant Other Observable Inputs (Level 2) | Residential real estate
    
Impaired collateral-dependent loans which are measured at fair value on a nonrecurring basis:    
Impaired collateral-dependent loans, Fair value      
Nonrecurring Basis | Significant Other Observable Inputs (Level 2) | Commercial Real Estate
    
Impaired collateral-dependent loans which are measured at fair value on a nonrecurring basis:    
Impaired collateral-dependent loans, Fair value      
Nonrecurring Basis | Significant Other Observable Inputs (Level 2) | Land and construction
    
Impaired collateral-dependent loans which are measured at fair value on a nonrecurring basis:    
Impaired collateral-dependent loans, Fair value      
Nonrecurring Basis | Signficiant Unobservable Inputs (Level 3)
    
Impaired collateral-dependent loans which are measured at fair value on a nonrecurring basis:    
Impaired collateral-dependent loans, Fair value 8,366 15,215
Foreclosed real estate,Fair value 10,938 7,646
Nonrecurring Basis | Signficiant Unobservable Inputs (Level 3) | Residential real estate
    
Impaired collateral-dependent loans which are measured at fair value on a nonrecurring basis:    
Impaired collateral-dependent loans, Fair value 1,247  
Nonrecurring Basis | Signficiant Unobservable Inputs (Level 3) | Commercial Real Estate
    
Impaired collateral-dependent loans which are measured at fair value on a nonrecurring basis:    
Impaired collateral-dependent loans, Fair value 6,232 6,831
Nonrecurring Basis | Signficiant Unobservable Inputs (Level 3) | Land and construction
    
Impaired collateral-dependent loans which are measured at fair value on a nonrecurring basis:    
Impaired collateral-dependent loans, Fair value $ 887 $ 6,793