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Fair Value Measurements and Fair Value of Financial Instruments (Additional Qualitative Information about Level 3 Assets) (Details) (Significant Unobservable Inputs (Level 3) [Member], USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Impaired Loans [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, Fair Value Disclosure, Nonrecurring $ 11,084  
Fair Value Measurements, Valuation Techniques

Appraisal of

collateral

Appraisal of

collateral

 [1]
Impaired Loans [Member] | Minimum [Member] | Unobservable Inputs Appraisal Adjustments [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value Disclosure, Unbservable Input Range 0.00% [2]  
Impaired Loans [Member] | Maximum [Member] | Unobservable Inputs Appraisal Adjustments [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value Disclosure, Unbservable Input Range 30.00% [2] 30.00% [2]
Impaired Loans [Member] | Weighted Average [Member] | Unobservable Inputs Appraisal Adjustments [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value Disclosure, Unbservable Input Range 24.07% [2] 24.10% [2]
Foreclosed Real Estate Owned [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, Fair Value Disclosure, Nonrecurring $ 1,099  
Fair Value Measurements, Valuation Techniques

Appraisal of

collateral

Appraisal of

collateral

 [1],[3]
Foreclosed Real Estate Owned [Member] | Unobservable Inputs - Liquidation Expenses [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value Disclosure, Unbservable Input Range 20.00% 20.00%
[1] 1) Fair value is generally determined through independent appraisals of the underlying collateral, which generally include various level 3 inputs which are not identifiable, less any associated allowance.
[2] (2) Appraisals may be adjusted by management for qualitative factors such as economic conditions and estimated liquidation expenses. The range and weighted average of liquidation expenses and other
[3] (3) Includes qualitative adjustments by management and estimated liquidation expenses.