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Derivative Financial Instruments (Details 2) (USD $)
 9 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Sep. 30, 2014
Residential mortgage-backed security (RMBS)
item
Sep. 30, 2013
Residential mortgage-backed security (RMBS)
Dec. 31, 2013
Residential mortgage-backed security (RMBS)
Sep. 30, 2014
Residential mortgage-backed security (RMBS)
Minimum
Sep. 30, 2014
Residential mortgage-backed security (RMBS)
Maximum
Sep. 30, 2014
Held-to-maturity securities
Residential mortgage-backed security (RMBS)
Sep. 30, 2013
Non-Qualifying
Basis Swaps
Sep. 30, 2014
Non-Qualifying
Basis Swaps
Dec. 31, 2013
Non-Qualifying
Basis Swaps
Sep. 30, 2014
Non-Qualifying
Basis Swaps
Interest Expense
Sep. 30, 2013
Non-Qualifying
Basis Swaps
Interest Expense
Sep. 30, 2014
Non-Qualifying
Basis Swaps
Maximum
Sep. 30, 2013
Non-Qualifying
Basis Swaps
Maximum
Sep. 30, 2014
Non-Qualifying
Basis Swaps
Maximum
Dec. 31, 2013
Non-Qualifying
Forward Contracts
Sep. 30, 2014
Non-Qualifying
Forward Contracts
Other Income
Sep. 30, 2013
Non-Qualifying
Forward Contracts
Other Income
Sep. 30, 2014
Qualifying
Interest Rate Swaps
Sep. 30, 2013
Qualifying
Interest Rate Swaps
Sep. 30, 2014
Terminated hedges
Interest Rate Swaps
Sep. 30, 2013
Terminated hedges
Interest Rate Swaps
Sep. 30, 2014
Terminated hedges
Interest Rate Swaps
Sep. 30, 2013
Terminated hedges
Interest Rate Swaps
Dec. 31, 2013
Terminated hedges
Interest Rate Swaps
Derivative Financial Instruments                                                      
Amount of Loss (Gain) Recognized in Other Comprehensive Loss (Effective Portion)                                         $ 813,000 $ 98,000          
Amount of Loss Reclassified from Accumulated Other Comprehensive Loss into Interest Expense (Effective Portion)                                         (9,615,000) (10,564,000)          
Change in fair value       (100,000) (1,700,000)         (100,000)     1,000 (11,000) (100,000) (100,000) (100,000)   (45,000) (1,688,000)              
Net deferred loss in accumulated other comprehensive loss                                             1,200,000   1,200,000   1,600,000
Additional interest expense related to the amortization of the loss                                             200,000 200,000 500,000 600,000  
Reduction to interest expense related to the accretion of the net gains                                             100,000 100,000 200,000 200,000  
Amount of net deferred loss expected to be recorded to interest expense over the next twelve months                                             500,000   500,000    
Fair Value, classified in Other Assets           66,000,000         3,000 5,000           6,397,000                  
Net unrealized losses in fair value of RMBS investments           1,500,000                                          
Repurchase financing           59,600,000                                          
Percentage of finance to individual investment             80.00% 90.00%                                      
Variable rate, spread (as a percent)             1.25% 1.75%                                      
Variable interest rate, description       LIBOR                                              
Number of investments sold       8                                              
Aggregate carrying value of investments sold                 65,700,000                                    
Proceeds from sale of investments                 65,800,000                                    
Net gain on sale of investments                 100,000                                    
Total principal paydowns 663,684 30,335,656   2,700,000                                              
Debt paid down due to principal paydowns received       4,200,000                                              
Decrease in the amount financed on the repurchase agreements       1,700,000                                              
Amount of repurchase agreement for financing the purchase of investments       55,400,000                                              
Net interest income       300,000 1,600,000                                            
Cumulative amount of other comprehensive loss related to net unrealized losses on derivatives designated as qualifying hedges (17,500,000)   (26,300,000)                                                
Cumulative amount of other comprehensive loss related to net unrealized losses on derivatives designated as cash flow hedges attributable to fair value of qualifying cash flow hedges (16,300,000)   (24,800,000)                                                
Cumulative amount of other comprehensive loss related to net unrealized losses on derivatives designated as cash flow hedges attributable to deferred losses terminated interest swaps (1,400,000)   (1,900,000)                                                
Cumulative amount of other comprehensive loss related to net unrealized losses on derivatives designated as cash flow hedges attributable to deferred gains on terminated interest swaps 200,000   300,000                                                
Fair value of derivatives in a net liability position (10,200,000)   (13,800,000)                                                
Collateral posted $ 10,600,000   $ 14,200,000