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Disclosures About Fair Value of Financial Instruments - Quantitative information about Level 3 fair value measurements (Unaudited) (Details 3) (USD $)
In Thousands, unless otherwise specified
12 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Unobservable (Level 3) Inputs
Fair Value, Measurements, Recurring
Dec. 31, 2011
Unobservable (Level 3) Inputs
Fair Value, Measurements, Recurring
Dec. 31, 2012
Unobservable (Level 3) Inputs
Fair Value, Measurements, Recurring
Impaired loans
Dec. 31, 2012
Unobservable (Level 3) Inputs
Fair Value, Measurements, Recurring
Impaired loans
Minimum
Dec. 31, 2012
Unobservable (Level 3) Inputs
Fair Value, Measurements, Recurring
Impaired loans
Maximum
Dec. 31, 2012
Unobservable (Level 3) Inputs
Fair Value, Measurements, Recurring
Impaired loans
Valuation Techniques
Dec. 31, 2012
Unobservable (Level 3) Inputs
Fair Value, Measurements, Recurring
Real estate held for sale
Dec. 31, 2012
Unobservable (Level 3) Inputs
Fair Value, Measurements, Recurring
Real estate held for sale
Minimum
Dec. 31, 2012
Unobservable (Level 3) Inputs
Fair Value, Measurements, Recurring
Real estate held for sale
Maximum
Dec. 31, 2012
Unobservable (Level 3) Inputs
Fair Value, Measurements, Recurring
Real estate held for sale
Valuation Techniques
Dec. 31, 2012
Unobservable (Level 3) Inputs
Fair Value, Measurements, Recurring
Corporate
Dec. 31, 2012
Unobservable (Level 3) Inputs
Fair Value, Measurements, Recurring
Corporate
Minimum
Dec. 31, 2012
Unobservable (Level 3) Inputs
Fair Value, Measurements, Recurring
Corporate
Maximum
Dec. 31, 2012
Unobservable (Level 3) Inputs
Fair Value, Measurements, Recurring
Corporate
Valuation Techniques
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                
Impaired loans         $ 4,363                      
Real estate held for sale 1,610 2,487             700              
Securities available for sale - Corporate $ 113,770 $ 104,689 $ 1,197 $ 1,090                 $ 1,197      
Valuation Techniques               Comparative sales based on independent appraisal       Comparative sales based on independent appraisal       Discounted cash flows
Marketability Discount           10.00% 20.00%     10.00% 20.00%          
Default probability                           0.21% 1.73%  
Loss, given default                         100.00%      
Discount rate                           3.32% 9.00%  
Recovery rate                           0.00% 15.00%  
Prepayment rate                           1.00% 40.00%