Quarterly report pursuant to Section 13 or 15(d)

Fair Value Fair Value, Option, Quantitative Disclosures - changes included in net income (Details)

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Fair Value Fair Value, Option, Quantitative Disclosures - changes included in net income (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Fair Value, Option, Quantitative Disclosures [Line Items]        
Fair Value, Option, Total Included in Net Income $ (6,288) $ 174 $ 24,034 $ 199
Fair Value, Option, Credit Risk, Gains (Losses) on Assets 0 0 0 0
Interest Income on Mortgage Loans Held-for-Sale [Member] | Loans Receivable [Member]
       
Fair Value, Option, Quantitative Disclosures [Line Items]        
Fair Value, Option, Interest Income (Expense) 4,794 126 6,112 195
Interest Income on Mortgage Loans Held-for-Investment [Member] | Fair Value Option, Other Eligible Items [Member]
       
Fair Value, Option, Quantitative Disclosures [Line Items]        
Fair Value, Option, Interest Income (Expense) 4,369 0 6,023 0
Interest Expense on Collateralized Borrowings in Securitization Trust [Member] | Borrowings [Member]
       
Fair Value, Option, Quantitative Disclosures [Line Items]        
Fair Value, Option, Interest Income (Expense) (2,169) 0 (2,987) 0
Gain (Loss) on Mortgage Loans [Member] | Loans Receivable [Member]
       
Fair Value, Option, Quantitative Disclosures [Line Items]        
Fair Value, Option, Realized Gain (Loss) 297 (22) 235 (22)
Fair Value, Option, Changes in Fair Value, Gain (Loss) (15,137) 70 (1,039) 26
Other Income [Member] | Fair Value Option, Other Eligible Items [Member]
       
Fair Value, Option, Quantitative Disclosures [Line Items]        
Fair Value, Option, Changes in Fair Value, Gain (Loss) (16,755) 0 (24,757) 0
Other Income [Member] | Borrowings [Member]
       
Fair Value, Option, Quantitative Disclosures [Line Items]        
Fair Value, Option, Changes in Fair Value, Gain (Loss) 18,313 0 32,604 0
Marketable Securities, Gain (Loss), Excluding Other than Temporary Impairments [Member] | Equity Securities [Member]
       
Fair Value, Option, Quantitative Disclosures [Line Items]        
Fair Value, Option, Realized Gain (Loss) 13,725 0 13,725 0
Fair Value, Option, Changes in Fair Value, Gain (Loss) $ (13,725) $ 0 $ (5,882) $ 0