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Fair Value of Assets and Liabilities (Details 2) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended 12 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Collateral-dependent impaired loans [Member]
    
Quantitative information about unobservable inputs used in recurring and nonrecurring fair value measurements    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value $ 1,677 $ 2,227
Fair Value Measurements, Valuation Technique Market comparable properties  
Fair Value Measurements, Unobservable Inputs Comparability adjustments (%)  
Collateral-dependent impaired loans [Member] | Comparability adjustments (%) [Member]
    
Quantitative information about unobservable inputs used in recurring and nonrecurring fair value measurements    
Fair Value Measurements, Range (Weighted Average) 0.00% 0.00%
Mortgage servicing rights [Member]
    
Quantitative information about unobservable inputs used in recurring and nonrecurring fair value measurements    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 2,234 2,667
Fair Value Measurements, Valuation Technique Discounted cash flow  
Fair Value Measurements, Unobservable Inputs Discount Rate Constant prepayment rate P&I earnings credit T&I earnings credit Inflation for cost of servicing  
Mortgage servicing rights [Member] | Discount Rate [Member]
    
Quantitative information about unobservable inputs used in recurring and nonrecurring fair value measurements    
Fair Value Measurements, Range (Weighted Average) 9.75% 8.50%
Mortgage servicing rights [Member] | Constant prepayment rate [Member]
    
Quantitative information about unobservable inputs used in recurring and nonrecurring fair value measurements    
Fair Value Measurements, Range (Weighted Average) 9.80% 15.60%
Mortgage servicing rights [Member] | P&I earnings credit [Member]
    
Quantitative information about unobservable inputs used in recurring and nonrecurring fair value measurements    
Fair Value Measurements, Range (Weighted Average) 0.19% 0.21%
Mortgage servicing rights [Member] | T&I earnings credit [Member]
    
Quantitative information about unobservable inputs used in recurring and nonrecurring fair value measurements    
Fair Value Measurements, Range (Weighted Average) 1.06% 0.81%
Mortgage servicing rights [Member] | Inflation for cost of servicing [Member]
    
Quantitative information about unobservable inputs used in recurring and nonrecurring fair value measurements    
Fair Value Measurements, Range (Weighted Average) 1.50% 1.50%
Foreclosed assets [Member]
    
Quantitative information about unobservable inputs used in recurring and nonrecurring fair value measurements    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value $ 84 $ 950
Fair Value Measurements, Valuation Technique Market comparable properties  
Fair Value Measurements, Unobservable Inputs Marketability discount  
Foreclosed assets [Member] | Marketability discount [Member]
    
Quantitative information about unobservable inputs used in recurring and nonrecurring fair value measurements    
Fair Value Measurements, Range (Weighted Average) 10.00% 10.00%