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Basis Of Presentation And Significant Accounting Policies (Narrative) (Details) (USD $)
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Dec. 31, 2010
Earnings attributable to restricted shareholders$ 0$ 0$ 0$ 0 
Number of VIEs requiring consolidation0 0 0
Land under purchase options, recorded25,422,000 25,422,000 50,781,000
Remaining purchase price of all land option agreements760,400,000 760,400,000 670,500,000
Residential mortgage loans available-for-sale fair value174,000,000 174,000,000 176,200,000
Residential mortgage loans available-for-sale outstanding principal balance166,500,000 166,500,000 175,900,000
Net gain (loss) from change in fair value800,000(900,000)(600,000)1,000,000 
Net gains from the sale of mortgages16,100,00015,600,00041,200,00050,700,000 
Reserves for servicing rights recognized400,000 400,000 500,000
Servicing rights recognized1,900,0004,200,00010,600,00017,000,000 
Interest rate lock commitments, face value209,000,000 209,000,000 99,000,000
Unexpired cash forward contracts337,400,000 337,400,000 198,000,000
Whole loan investor commitments$ 5,400,000 $ 5,400,000 $ 59,000,000
Variability in future cash flows of derivative instruments in days  75  
Minimum [Member]
     
Period of reimbursement of payments on loan prepays, in days  90  
Maximum [Member]
     
Period of reimbursement of payments on loan prepays, in days  120