Quarterly report pursuant to Section 13 or 15(d)

Fair Value Fair Value, Quantitative Information about Level 3 Fair Value Measurement (Details)

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Fair Value Fair Value, Quantitative Information about Level 3 Fair Value Measurement (Details) (Fair Value, Measurements, Recurring [Member], USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]    
Mortgages Held-for-sale, Fair Value Disclosure $ 5,711 $ 5,782
Fair Value, Inputs, Level 3 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]    
Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Prepayment Speed 17.80%  
Mortgages Held-for-sale, Fair Value Disclosure $ 5,711 $ 5,782
Fair Value, Investments, Valuation Techniques Discounted cash flow  
Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Expected Credit Losses 3.00%  
Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Other Key Assumption Rate or Value .25  
Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Discount Rate 4.22%