Consolidated Balance Sheets (Parentheticals) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Pledged securities (in Dollars) $ 853,223 $ 954,656
Assets of consolidated variable interest entity (VIEs) (in Dollars) 8,665,829 5,786,569
Accrued expenses and other liabilities, related parties (in Dollars) 951 211
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities (in Dollars) $ 8,365,345 $ 5,636,650
Preferred stock, par value (in Dollars per share) $ 0.01  
Preferred stock, shares issued 3,000,000 0
Preferred stock, shares authorized 200,000,000  
Preferred stock, shares outstanding 3,000,000 0
Preferred stock, Series B cumulative redeemable, dividend rate 7.75% 7.75%
Series B Preferred Stock [Member]
   
Preferred stock, par value (in Dollars per share) $ 0.01 $ 0.01
Preferred stock, liquidation preference per share (in Dollars per share) $ 25 $ 25
Preferred stock, shares issued 3,000,000 0
Preferred stock, shares authorized 3,450,000 3,450,000
Preferred stock, shares outstanding 3,000,000 0
Preferred stock, Series B cumulative redeemable, dividend rate 7.75%  
Common stock, par value (in Dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized 400,000,000 400,000,000
Common Stock, Shares Issued 64,102,029 49,575,331
Common stock, shares outstanding 64,102,029 49,575,331