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Debt Securities (Details 2) (USD $)
1 Months Ended3 Months Ended9 Months Ended12 Months Ended
Jun. 30, 2011
loan
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Dec. 31, 2010
Estimated Fair Value     
Securities in a loss less than 12 months $ 289,399,000 $ 289,399,000 
Securities in a loss greater than 12 months 680,000 680,000 
Unrealized Losses     
Securities in a loss less than 12 months (6,825,000) (6,825,000) 
Securities in a loss greater than 12 months (118,000) (118,000) 
MBS credit losses 892,000 2,621,000 
Mortgage-backed securities
     
Mortgage-Backed Securities Available-for-Sale     
Description of variable rate basis   one-month LIBORone-month LIBOR
Number of securities with unrealized loss position 33 33 
Number of securities with recognized other-than-temporary impairment charge 7 7 
Other-than-temporary-impairment charge recognized relating to securities   1,300,000 
Number of securities with unrealized losses excluding other than temporarily impaired 26 26 
Unrealized Losses     
MBS credit losses 900,000 2,600,000 
Number of securities pertaining to which no material credit events had occurred from the date of acquisition 12   
Number of securities for which present value of the estimated cash flows was greater than the present value of the originally estimated cash flows   7 
CMBS
     
Mortgage-Backed Securities Available-for-Sale     
Sales/Maturities   223,378,000 
Principal payments received   42,220,000 
Number of loans reclassified from loans held for investment to mortgage backed securities, available-for-sale1    
Loan reclassified from loans held for investment to mortgage backed securities, available-for-sale176,600,000    
Unrealized gain recognized7,900,000 10,300,000  
Sale of available-for-sale equity securities 0 211,600,000 
Sale of available-for-sale equity securities, net of financing repayments   74,000,000 
Gain from sale of available-for-sale equity securities 0 9,900,000 
Available-for-sale securities amount matured 0 11,800,000 
Portion of securities with variable rate (as a percent) 100.00% 100.00%5.00%
Description of variable rate basis   LIBORLIBOR
Variable rate, weighted average spread (as a percent)   1.72%1.30%
Estimated Fair Value     
Securities in a loss less than 12 months 187,707,000 187,707,000 
Unrealized Losses     
Securities in a loss less than 12 months (5,035,000) (5,035,000) 
RMBS
     
Mortgage-Backed Securities Available-for-Sale     
Purchases   139,953,000 
Sales/Maturities   49,951,000 
Principal payments received   52,607,000 
Portion of securities with variable rate (as a percent) 97.40% 97.40%98.50%
Portion of securities with variable rate 160,100,000 160,100,000120,700,000
Description of variable rate basis   LIBORLIBOR
Variable rate, weighted average spread (as a percent)   0.45%0.31%
Maximum investment in available-for-sale securities with aggregate expected modified durations of less than 12 months (as a percent)   10.00% 
Cost of third party management   500,000 
Estimated Fair Value     
Securities in a loss less than 12 months 101,692,000 101,692,000 
Securities in a loss greater than 12 months 680,000 680,000 
Unrealized Losses     
Securities in a loss less than 12 months (1,790,000) (1,790,000) 
Securities in a loss greater than 12 months $ (118,000) $ (118,000)