Quarterly report pursuant to Section 13 or 15(d)

Fair Value Fair Value, Option, Quantitative Disclosures - change in balance (Details)

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Fair Value Fair Value, Option, Quantitative Disclosures - change in balance (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2011
Dec. 31, 2010
Fair Value, Option, Quantitative Disclosures [Line Items]        
Mortgage loans held-for-sale, at fair value $ 14,553 $ 5,782 $ 0 $ 0
Loan Held-for-Sale, Mortgages, Unpaid Principal [Member]
       
Fair Value, Option, Quantitative Disclosures [Line Items]        
Mortgage loans held-for-sale, at fair value 14,156 5,655    
Fair Value, Option, Loans Held as Assets, Aggregate Amount in Nonaccrual Status 0 0    
Fair Value, Option, Loans Held as Assets, 90 Days or More Past Due 0      
Loans Held-for-Sale, Mortgages, Fair Value Adjustment [Member]
       
Fair Value, Option, Quantitative Disclosures [Line Items]        
Mortgage loans held-for-sale, at fair value 14,553 5,782    
Fair Value, Option, Loans Held as Assets, Aggregate Amount in Nonaccrual Status 0 0    
Fair Value, Option, Loans Held as Assets, 90 Days or More Past Due $ 0 $ 0