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Net Interest Income Analysis (Summary Of Interest Income, Interest Expense And Weighted Average Interest Rates) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Dec. 31, 2011
Component of Other Expense, Nonoperating [Line Items]      
Residential mortgage investments $ 65,733 $ 53,141  
Other, Interest income 150 113  
Interest income 65,883 53,254  
Repurchase arrangements and similar borrowings (14,103) (12,322)  
Unsecured borrowings (2,187) (2,187)  
Other, Interest expense   (4)  
Interest expense (16,290) (14,513)  
Net interest income (expense) 49,593 38,741  
Residential mortgage investments, Average Rate 2.14% 2.36%  
Other, Average Rate 0.15% 0.19%  
Interest income, Average Rate 2.08% 2.31%  
Repurchase arrangements and similar borrowings, Average Rate 0.49% 0.59%  
Unsecured borrowings, Average Rate 8.49% [1] 8.49% 8.49%
Other, Average Rate   0.16%  
Interest expense, Average Rate 0.56% 0.69%  
Interest income and interest expense, Average Rate 1.52% 1.62%  
Related Changes In Rate [Member]
     
Component of Other Expense, Nonoperating [Line Items]      
Residential mortgage investments (5,372) [2]    
Other (26) [2]    
Interest income (5,398) [2]    
Repurchase arrangements and similar borrowings (2,446) [2]    
Unsecured borrowings    [2]    
Interest expense (2,446) [2]    
Net interest income (expense) (2,952) [2]    
Related Changes In Volume [Member]
     
Component of Other Expense, Nonoperating [Line Items]      
Residential mortgage investments 17,964 [2]    
Other 63 [2]    
Interest income 18,027 [2]    
Repurchase arrangements and similar borrowings 4,227 [2]    
Unsecured borrowings    [2]    
Other (4) [2]    
Interest expense 4,223 [2]    
Net interest income (expense) 13,804 [2]    
Related Changes In Total [Member]
     
Component of Other Expense, Nonoperating [Line Items]      
Residential mortgage investments 12,592 [2]    
Other 37 [2]    
Interest income 12,629 [2]    
Repurchase arrangements and similar borrowings 1,781 [2]    
Unsecured borrowings    [2]    
Other (4) [2]    
Interest expense 1,777 [2]    
Net interest income (expense) $ 10,852 [2]    
[1] After considering cash flow hedges that coincide with the floating rate terms of these borrowings that begin in 2015 and 2016, the effective borrowing rate during the final 20 years of these borrowings will average 7.56%, subject to certain adjustments for the effects of measured hedge ineffectiveness, if any.
[2] The change in interest income and interest expense due to both volume and rate has been allocated to volume and rate changes in proportion to the relationship of the absolute dollar amounts of the change in each.