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Mortgage Backed Securities (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale MBS, Par Balance $ 2,160,483   $ 2,160,483   $ 2,422,883
Available-for-sale MBS, Net Premium (Discount) 755,525   755,525   822,084
Available-for-sale MBS, Amortized Cost 2,916,008   2,916,008   3,244,967
Available-for-sale MBS, Gross Unrealized Gain 24,222   24,222   19,643
Available-for-sale MBS, Gross Unrealized Loss (18,786)   (18,786)   (52,526)
Available-for-sale MBS, Fair Value 2,921,444   2,921,444   3,212,084
Available-for-sale MBS, Sale Proceeds 406,935 $ 0 975,665 $ 87,818  
Available-for-sale MBS, Gross Realized Gain (Loss) 5,211 0 (10,628) (4,238)  
Agency MBS          
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale MBS, Continuous Unrealized Loss Position for less than 12 months, Fair Value 1,377,438   1,377,438   1,738,094
Available-for-sale MBS, Continuous Unrealized Loss Position for less than 12 months, Accumulated Loss $ (13,201)   $ (13,201)   $ (38,469)
Available-for-sale MBS, Number of Securities in Continuous Unrealized Loss Position for less than 12 months 76   76   133
Available-for-sale MBS, Continuous Unrealized Loss Position for 12 months or longer, Fair Value $ 206,045   $ 206,045   $ 427,405
Available-for-sale MBS, Continuous Unrealized Loss Position for 12 months or longer, Accumulated Loss $ (5,236)   $ (5,236)   $ (8,952)
Available-for-sale MBS, Number of Securities in Continuous Unrealized Loss Position for 12 months or longer 17   17   72
Non-Agency MBS          
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale MBS, Continuous Unrealized Loss Position for less than 12 months, Fair Value $ 38,979   $ 38,979   $ 205,484
Available-for-sale MBS, Continuous Unrealized Loss Position for less than 12 months, Accumulated Loss $ (151)   $ (151)   $ (2,773)
Available-for-sale MBS, Number of Securities in Continuous Unrealized Loss Position for less than 12 months 6   6   48
Available-for-sale MBS, Continuous Unrealized Loss Position for 12 months or longer, Fair Value $ 15,749   $ 15,749   $ 81,660
Available-for-sale MBS, Continuous Unrealized Loss Position for 12 months or longer, Accumulated Loss $ (199)   $ (199)   $ (2,332)
Available-for-sale MBS, Number of Securities in Continuous Unrealized Loss Position for 12 months or longer 11   11   26
CMBS          
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale MBS, Par Balance $ 1,343,017   $ 1,343,017   $ 1,232,053
Available-for-sale MBS, Net Premium (Discount) 8,236   8,236   7,150
Available-for-sale MBS, Amortized Cost 1,351,253   1,351,253   1,239,203
Available-for-sale MBS, Gross Unrealized Gain 9,064   9,064   11,676
Available-for-sale MBS, Gross Unrealized Loss (13,623)   (13,623)   (28,108)
Available-for-sale MBS, Fair Value 1,346,694   1,346,694   1,222,771
CMBS | Agency MBS          
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale MBS, Par Balance 1,302,237   1,302,237   1,152,586
Available-for-sale MBS, Net Premium (Discount) 12,688   12,688   13,868
Available-for-sale MBS, Amortized Cost 1,314,925   1,314,925   1,166,454
Available-for-sale MBS, Gross Unrealized Gain 6,187   6,187   6,209
Available-for-sale MBS, Gross Unrealized Loss (13,623)   (13,623)   (28,108)
Available-for-sale MBS, Fair Value $ 1,307,489   $ 1,307,489   $ 1,144,555
Available-for-sale MBS, Weighted Average Coupon [1] 2.99%   2.99%   3.12%
Available-for-sale MBS, Sale Proceeds $ 13,433 0 $ 206,993 0  
Available-for-sale MBS, Gross Realized Losses   0 (51) 0  
Available-for-sale Securities MBS, Gross Realized Gains     523    
CMBS | Non-Agency MBS          
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale MBS, Par Balance 40,780   40,780   $ 79,467
Available-for-sale MBS, Net Premium (Discount) (4,452)   (4,452)   (6,718)
Available-for-sale MBS, Amortized Cost 36,328   36,328   72,749
Available-for-sale MBS, Gross Unrealized Gain 2,877   2,877   5,467
Available-for-sale MBS, Gross Unrealized Loss 0   0   0
Available-for-sale MBS, Fair Value $ 39,205   $ 39,205   $ 78,216
Available-for-sale MBS, Weighted Average Coupon [1] 5.48%   5.48%   4.72%
Available-for-sale MBS, Sale Proceeds     $ 35,705 33,640  
Available-for-sale MBS, Gross Realized Losses       (1,228)  
Available-for-sale Securities MBS, Gross Realized Gains     1,199    
CMBS IO          
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale MBS, Par Balance $ 0   0   $ 0
Available-for-sale MBS, Net Premium (Discount) 717,115   717,115   757,892
Available-for-sale MBS, Amortized Cost 717,115   717,115   757,892
Available-for-sale MBS, Gross Unrealized Gain 13,846   13,846   5,071
Available-for-sale MBS, Gross Unrealized Loss (494)   (494)   (8,417)
Available-for-sale MBS, Fair Value 730,467   730,467   754,546
CMBS IO | Agency MBS          
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale MBS, Par Balance 0 [2]   0 [2]   0 [3]
Available-for-sale MBS, Net Premium (Discount) 394,380   394,380   411,737
Available-for-sale MBS, Amortized Cost 394,380   394,380   411,737
Available-for-sale MBS, Gross Unrealized Gain 7,592   7,592   3,523
Available-for-sale MBS, Gross Unrealized Loss (164)   (164)   (3,362)
Available-for-sale MBS, Fair Value $ 401,808   $ 401,808   $ 411,898
Available-for-sale MBS, Weighted Average Coupon [1] 0.63%   0.63%   0.67%
Notional balance for interest only securities $ 14,253,392   $ 14,253,392   $ 13,106,912
CMBS IO | Non-Agency MBS          
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale MBS, Par Balance [2] 0   0    
Available-for-sale MBS, Net Premium (Discount) 322,735   322,735   346,155
Available-for-sale MBS, Amortized Cost 322,735   322,735   346,155
Available-for-sale MBS, Gross Unrealized Gain 6,254   6,254   1,548
Available-for-sale MBS, Gross Unrealized Loss (330)   (330)   (5,055)
Available-for-sale MBS, Fair Value $ 328,659   $ 328,659   $ 342,648
Available-for-sale MBS, Weighted Average Coupon [1] 0.61%   0.61%   0.61%
Notional balance for interest only securities $ 11,061,377   $ 11,061,377   $ 10,884,964
RMBS          
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale MBS, Par Balance 817,466   817,466   1,190,830
Available-for-sale MBS, Net Premium (Discount) 30,174   30,174   57,042
Available-for-sale MBS, Amortized Cost 847,640   847,640   1,247,872
Available-for-sale MBS, Gross Unrealized Gain 1,312   1,312   2,896
Available-for-sale MBS, Gross Unrealized Loss (4,669)   (4,669)   (16,001)
Available-for-sale MBS, Fair Value 844,283   844,283   1,234,767
RMBS | Agency MBS          
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale MBS, Sale Proceeds 393,502 0 716,560 54,178  
Available-for-sale MBS, Gross Realized Losses (5,160) $ 0 (12,392) (3,010)  
RMBS | Agency MBS | Agency fixed-rate          
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale MBS, Par Balance 522,099   522,099    
Available-for-sale MBS, Net Premium (Discount) 19,163   19,163    
Available-for-sale MBS, Amortized Cost 541,262   541,262    
Available-for-sale MBS, Gross Unrealized Gain 0   0    
Available-for-sale MBS, Gross Unrealized Loss (1,903)   (1,903)    
Available-for-sale MBS, Fair Value $ 539,359   $ 539,359    
Available-for-sale MBS, Weighted Average Coupon [1] 3.52%   3.52%    
RMBS | Agency MBS | Agency adjustable-rate          
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale MBS, Par Balance $ 294,254   $ 294,254    
Available-for-sale MBS, Net Premium (Discount) 11,011   11,011    
Available-for-sale MBS, Amortized Cost 305,265   305,265    
Available-for-sale MBS, Gross Unrealized Gain 1,263   1,263    
Available-for-sale MBS, Gross Unrealized Loss (2,746)   (2,746)    
Available-for-sale MBS, Fair Value $ 303,782   $ 303,782    
Available-for-sale MBS, Weighted Average Coupon [1] 3.05%   3.05%    
RMBS | Non-Agency MBS          
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale MBS, Par Balance $ 1,113   $ 1,113   33,572
Available-for-sale MBS, Net Premium (Discount) 0   0   (24)
Available-for-sale MBS, Amortized Cost 1,113   1,113   33,548
Available-for-sale MBS, Gross Unrealized Gain 49   49   64
Available-for-sale MBS, Gross Unrealized Loss (20)   (20)   (50)
Available-for-sale MBS, Fair Value $ 1,142   $ 1,142   $ 33,562
Available-for-sale MBS, Weighted Average Coupon [1] 6.75%   6.75%   3.58%
Available-for-sale MBS, Sale Proceeds     $ 16,407 0  
Available-for-sale MBS, Gross Realized Losses       $ 0  
Available-for-sale Securities MBS, Gross Realized Gains     $ 42    
Variable interest rate [Member] | RMBS | Agency MBS          
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale MBS, Par Balance         $ 1,157,258
Available-for-sale MBS, Net Premium (Discount)         57,066
Available-for-sale MBS, Amortized Cost         1,214,324
Available-for-sale MBS, Gross Unrealized Gain         2,832
Available-for-sale MBS, Gross Unrealized Loss         (15,951)
Available-for-sale MBS, Fair Value         $ 1,201,205
Available-for-sale MBS, Weighted Average Coupon [1]         3.05%
[1] The weighted average coupon ("WAC") is the gross interest rate of the security weighted by the outstanding principal balance (or by notional balance in the case of an IO security).
[2] The notional balance for Agency CMBS IO and non-Agency CMBS IO was $14,253,392 and $11,061,377, respectively, as of September 30, 2017.
[3] The notional balance for the Agency CMBS IO and non-Agency CMBS IO was $13,106,912 and $10,884,964, respectively, as of December 31, 2016.