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Consolidated Condensed Schedule of Investments (Long Investments)
shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
property
shares
Schedule of Investments [Line Items]  
Fair Value $ 2,939,311
Number of Real Estate Properties | property 20
Investments at value, cost $ 2,970,306
Percentage collateralized by GNRCMO certificates 100.00%
Non-performing loans, maturity date not applicable $ 47,300
Mortgage Loans in Process of Foreclosure, Amount $ 9,100
Unrated But Agency-Guaranteed [Member]  
Schedule of Investments [Line Items]  
Long investment holdings as a percentage of stockholders' equity 243.66%
Long Investment Aaa Rating [Member]  
Schedule of Investments [Line Items]  
Long investment holdings as a percentage of stockholders' equity 0.01%
Long Investment Aa Rating [Member]  
Schedule of Investments [Line Items]  
Long investment holdings as a percentage of stockholders' equity 0.63%
Long Investment A Rating [Member]  
Schedule of Investments [Line Items]  
Long investment holdings as a percentage of stockholders' equity 4.73%
Long Investment BBB Rating [Member]  
Schedule of Investments [Line Items]  
Long investment holdings as a percentage of stockholders' equity 1.84%
Long Investment BB Rating [Member]  
Schedule of Investments [Line Items]  
Long investment holdings as a percentage of stockholders' equity 46.34%
Long Investment Unrated Rating [Member]  
Schedule of Investments [Line Items]  
Long investment holdings as a percentage of stockholders' equity 196.65%
Related Party-Consumer Loans Titled in Name of Related Party  
Schedule of Investments [Line Items]  
Fair value of loans held in related party trust $ 21,900
Purchasing Entity  
Schedule of Investments [Line Items]  
Fair value of loans held in related party trust $ 181,500
Principal And Interest - Fixed Rate Agency Securities  
Schedule of Investments [Line Items]  
Investment owned as a percentage of equity 148.68% [1],[2],[3],[4]
Fair Value $ 884,870
Interest Only - Fixed Rate Agency Securities  
Schedule of Investments [Line Items]  
Investment owned as a percentage of equity 1.77% [1],[2],[3],[4]
Fair Value $ 10,510
TBA - Fixed Rate Agency Securities  
Schedule of Investments [Line Items]  
Investment owned as a percentage of equity 79.78% [1],[2],[3],[4]
Current Principal/Notional Amount $ 460,037
Fair Value $ 474,860
Fixed Rate Agency Securities [Member]  
Schedule of Investments [Line Items]  
Investment owned as a percentage of equity 230.23% [1],[2],[3],[4]
Fair Value $ 1,370,240
Investments at value, cost $ 1,388,115 [1],[3],[4]
Principal And Interest - Floating Rate Agency Securities  
Schedule of Investments [Line Items]  
Investment owned as a percentage of equity 10.24% [1],[2],[3],[4]
Fair Value $ 60,971
Interest Only - Floating Rate Agency Securities [Member]  
Schedule of Investments [Line Items]  
Investment owned as a percentage of equity 3.19% [1],[2],[3],[4]
Fair Value $ 19,006
Floating Rate Agency Securities [Member]  
Schedule of Investments [Line Items]  
Investment owned as a percentage of equity 13.43% [1],[2],[3],[4]
Fair Value $ 79,977
Investments at value, cost $ 81,873 [1],[3],[4]
Agency Securities [Member]  
Schedule of Investments [Line Items]  
Investment owned as a percentage of equity 243.66% [1],[2],[3],[4]
Fair Value $ 1,450,217
Investments at value, cost $ 1,469,988 [1],[3],[4]
Principal And Interest - Private Label Securities [Member]  
Schedule of Investments [Line Items]  
Investment owned as a percentage of equity 55.33% [2],[3],[4]
Fair Value $ 329,317
Investments at value, cost $ 326,430 [3],[4]
Interest Only - Private Label Securities [Member]  
Schedule of Investments [Line Items]  
Investment owned as a percentage of equity 1.22% [2],[3],[4]
Fair Value $ 7,230
Investments at value, cost $ 5,189 [3],[4]
Other Private Label Securities [Member]  
Schedule of Investments [Line Items]  
Investment owned as a percentage of equity 0.00% [2],[3],[4]
Fair Value $ 0
Investments at value, cost $ 0 [3],[4]
Private Label Securities [Member]  
Schedule of Investments [Line Items]  
Investment owned as a percentage of equity 56.55% [2],[3],[4]
Fair Value $ 336,547
Investments at value, cost $ 331,619 [3],[4]
Mortgage-Backed Securities [Member]  
Schedule of Investments [Line Items]  
Investment owned as a percentage of equity 300.21% [2],[3],[4]
Fair Value $ 1,786,764
Investments at value, cost $ 1,801,607 [3],[4]
CLOs  
Schedule of Investments [Line Items]  
Investment owned as a percentage of equity 20.82% [2],[3],[4]
Fair Value $ 123,893
Investments at value, cost 139,424 [3],[4]
CLOs | Related Party CLO securitization [Member]  
Schedule of Investments [Line Items]  
Fair Value $ 50,800
Consumer loans and asset-backed securities backed by consumer loans  
Schedule of Investments [Line Items]  
Investment owned as a percentage of equity 34.74% [2],[3],[4],[5]
Fair Value $ 206,761
Investments at value, cost $ 211,982 [3],[4],[5]
Corporate debt securities  
Schedule of Investments [Line Items]  
Investment owned as a percentage of equity 3.76% [2],[3],[4]
Fair Value $ 22,392
Investments at value, cost $ 24,268 [3],[4]
Secured notes  
Schedule of Investments [Line Items]  
Investment owned as a percentage of equity 1.83% [2],[3],[4],[6]
Fair Value $ 10,917
Investments at value, cost $ 12,138 [3],[4],[6]
Mortgage Loans [Member]  
Schedule of Investments [Line Items]  
Investment owned as a percentage of equity 118.96% [2],[3],[4],[5]
Fair Value $ 708,015
Investments at value, cost $ 703,366 [3],[4],[5]
Real estate owned  
Schedule of Investments [Line Items]  
Investment owned as a percentage of equity 5.80% [2],[3],[4],[5],[7]
Fair Value $ 34,500
Investments at value, cost $ 35,371 [3],[4],[5],[7]
Common stock  
Schedule of Investments [Line Items]  
Investment owned as a percentage of equity 0.37% [2],[3],[4]
Fair Value $ 2,200
Investments at value, cost $ 2,482 [3],[4]
Corporate equity securities  
Schedule of Investments [Line Items]  
Investment owned as a percentage of equity 7.36% [2],[3],[4]
Fair Value $ 43,793
Investments at value, cost 39,592 [3],[4]
Corporate equity securities | Mortgage-related Commercial  
Schedule of Investments [Line Items]  
Fair Value $ 1,100
U.S. Treasury securities  
Schedule of Investments [Line Items]  
Investment owned as a percentage of equity 0.01% [2],[3],[4]
Fair Value $ 76
Investments at value, cost $ 76 [3],[4]
Long Investments [Member]  
Schedule of Investments [Line Items]  
Investment owned as a percentage of equity 493.86% [2],[3],[4]
Fair Value $ 2,939,311
Investments at value, cost $ 2,970,306 [3],[4]
Long Investments [Member] | Government National Mortgage Association [Member]  
Schedule of Investments [Line Items]  
Investment owned as a percentage of equity 107.55%
Long Investments [Member] | Federal National Mortgage Association [Member]  
Schedule of Investments [Line Items]  
Investment owned as a percentage of equity 93.99%
Long Investments [Member] | Federal Home Loan Mortgage Corporation [Member]  
Schedule of Investments [Line Items]  
Investment owned as a percentage of equity 42.12%
Securitized residential mortgage loans  
Schedule of Investments [Line Items]  
Fair Value of Assets Transfered and Accounted for as Secured Borrowings $ 314,200
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Federal National Mortgage Association Pools (30 Year) 4.00% [Member] | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Current Principal/Notional Amount $ 143,523
Investment Interest Rate 4.00%
Fair Value $ 147,395
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Federal National Mortgage Association Pools (30 Year) 4.00% [Member] | Minimum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2039-09
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Federal National Mortgage Association Pools (30 Year) 4.00% [Member] | Maximum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2048-11
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Federal Home Loan Mortgage Corporation Pools (Thirty Year) Four Percent [Member] | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Current Principal/Notional Amount $ 111,109
Investment Interest Rate 4.00%
Fair Value $ 114,104
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Federal Home Loan Mortgage Corporation Pools (Thirty Year) Four Percent [Member] | Minimum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2041-11
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Federal Home Loan Mortgage Corporation Pools (Thirty Year) Four Percent [Member] | Maximum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2048-12
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Federal National Mortgage Association Pools (30 Year) 3.50% [Member] | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Current Principal/Notional Amount $ 82,189
Investment Interest Rate 3.50%
Fair Value $ 82,450
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Federal National Mortgage Association Pools (30 Year) 3.50% [Member] | Minimum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2042-09
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Federal National Mortgage Association Pools (30 Year) 3.50% [Member] | Maximum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2048-02
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Government National Mortgage Association Pools (30 Year) 4.50% [Member] | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Current Principal/Notional Amount $ 74,478
Investment Interest Rate 4.50%
Fair Value $ 77,266
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Government National Mortgage Association Pools (30 Year) 4.50% [Member] | Minimum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2046-09
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Government National Mortgage Association Pools (30 Year) 4.50% [Member] | Maximum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2049-01
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Federal National Mortgage Association Pools (Thirty Year) Four Point Five Percent [Member] | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Current Principal/Notional Amount $ 65,892
Investment Interest Rate 4.50%
Fair Value $ 68,853
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Federal National Mortgage Association Pools (Thirty Year) Four Point Five Percent [Member] | Minimum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2041-10
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Federal National Mortgage Association Pools (Thirty Year) Four Point Five Percent [Member] | Maximum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2048-12
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Government National Mortgage Association Pools (Thirty Year) Four Percent [Member] | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Current Principal/Notional Amount $ 51,362
Investment Interest Rate 4.00%
Fair Value $ 52,544
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Government National Mortgage Association Pools (Thirty Year) Four Percent [Member] | Minimum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2045-07
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Government National Mortgage Association Pools (Thirty Year) Four Percent [Member] | Maximum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2048-05
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Government National Mortgage Association Pools (Thirty Year) Five Percent [Member] | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Current Principal/Notional Amount $ 46,026
Investment Interest Rate 5.00%
Fair Value $ 48,245
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Government National Mortgage Association Pools (Thirty Year) Five Percent [Member] | Minimum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2048-02
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Government National Mortgage Association Pools (Thirty Year) Five Percent [Member] | Maximum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2048-12
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Federal Home Loan Mortgage Corporation Pools (Thirty Year) Four Point Five Percent [Member] | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Current Principal/Notional Amount $ 45,670
Investment Interest Rate 4.50%
Fair Value $ 47,583
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Federal Home Loan Mortgage Corporation Pools (Thirty Year) Four Point Five Percent [Member] | Minimum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2043-09
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Federal Home Loan Mortgage Corporation Pools (Thirty Year) Four Point Five Percent [Member] | Maximum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2048-10
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Federal National Mortgage Association Pools (Fifteen Year) Three Point Five Percent [Member] | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Current Principal/Notional Amount $ 42,663
Investment Interest Rate 3.50%
Fair Value $ 43,241
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Federal National Mortgage Association Pools (Fifteen Year) Three Point Five Percent [Member] | Minimum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2028-03
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Federal National Mortgage Association Pools (Fifteen Year) Three Point Five Percent [Member] | Maximum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2032-03
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Federal National Mortgage Association Pools (Thirty Year) Five Percent [Member] | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Current Principal/Notional Amount $ 38,420
Investment Interest Rate 5.00%
Fair Value $ 40,652
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Federal National Mortgage Association Pools (Thirty Year) Five Percent [Member] | Minimum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2035-10
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Federal National Mortgage Association Pools (Thirty Year) Five Percent [Member] | Maximum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2048-08
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Government National Mortgage Association Pools (Thirty Year) Three Point Five Percent [Member] | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Current Principal/Notional Amount $ 32,106
Investment Interest Rate 3.50%
Fair Value $ 32,253
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Government National Mortgage Association Pools (Thirty Year) Three Point Five Percent [Member] | Minimum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2042-12
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Government National Mortgage Association Pools (Thirty Year) Three Point Five Percent [Member] | Maximum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2047-12
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Federal Home Loan Mortgage Corporation Pools (Thirty Year) Three Point Five Percent [Member] | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Current Principal/Notional Amount $ 25,082
Investment Interest Rate 3.50%
Fair Value $ 25,185
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Federal Home Loan Mortgage Corporation Pools (Thirty Year) Three Point Five Percent [Member] | Minimum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2042-01
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Federal Home Loan Mortgage Corporation Pools (Thirty Year) Three Point Five Percent [Member] | Maximum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2048-03
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Government National Mortgage Association Pools (30 Year) 5.50% [Member] | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Current Principal/Notional Amount $ 21,807
Investment Interest Rate 5.50%
Fair Value $ 23,207
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Government National Mortgage Association Pools (30 Year) 5.50% [Member] | Minimum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2048-04
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Government National Mortgage Association Pools (30 Year) 5.50% [Member] | Maximum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2048-12
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Federal National Mortgage Association Pools (15 Year) 3.00% [Member] | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Current Principal/Notional Amount $ 10,899
Investment Interest Rate 3.00%
Fair Value $ 10,895
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Federal National Mortgage Association Pools (15 Year) 3.00% [Member] | Minimum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2030-04
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Federal National Mortgage Association Pools (15 Year) 3.00% [Member] | Maximum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2032-09
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Federal Home Loan Mortgage Corporation Pools (15 Year) 3.50% [Member] | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Current Principal/Notional Amount $ 8,275
Investment Interest Rate 3.50%
Fair Value $ 8,389
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Federal Home Loan Mortgage Corporation Pools (15 Year) 3.50% [Member] | Minimum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2028-09
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Federal Home Loan Mortgage Corporation Pools (15 Year) 3.50% [Member] | Maximum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2032-12
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Federal Home Loan Mortgage Corporation Pools (Other) Three Point Five Percent [Member] | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Current Principal/Notional Amount $ 7,287
Investment Interest Rate 3.50%
Fair Value $ 7,316
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Federal Home Loan Mortgage Corporation Pools (Other) Three Point Five Percent [Member] | Minimum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2043-04
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Federal Home Loan Mortgage Corporation Pools (Other) Three Point Five Percent [Member] | Maximum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2046-09
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Federal Home Loan Mortgage Corporation Pools (Thirty Year) 5.00% [Member] | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Current Principal/Notional Amount $ 6,096
Investment Interest Rate 5.00%
Fair Value $ 6,423
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Federal Home Loan Mortgage Corporation Pools (Thirty Year) 5.00% [Member] | Minimum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2044-07
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Federal Home Loan Mortgage Corporation Pools (Thirty Year) 5.00% [Member] | Maximum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2048-10
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Federal National Mortgage Association Pools (Fifteen Year) Four Percent [Member] | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Current Principal/Notional Amount $ 5,728
Investment Interest Rate 4.00%
Fair Value $ 5,823
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Federal National Mortgage Association Pools (Fifteen Year) Four Percent [Member] | Minimum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2026-06
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Federal National Mortgage Association Pools (Fifteen Year) Four Percent [Member] | Maximum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2031-05
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Federal National Mortgage Association Pools (Thirty Year) Five Point Five Percent [Member] | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Current Principal/Notional Amount $ 5,023
Investment Interest Rate 5.50%
Fair Value $ 5,342
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Federal National Mortgage Association Pools (Thirty Year) Five Point Five Percent [Member] | Minimum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2039-11
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Federal National Mortgage Association Pools (Thirty Year) Five Point Five Percent [Member] | Maximum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2048-06
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Federal National Mortgage Association Pools (Other) 5.00% [Member] | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Current Principal/Notional Amount $ 4,547
Investment Interest Rate 5.00%
Fair Value $ 4,772
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Federal National Mortgage Association Pools (Other) 5.00% [Member] | Minimum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2043-09
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Federal National Mortgage Association Pools (Other) 5.00% [Member] | Maximum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2044-01
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Federal National Mortgage Association Pools (Other) 4.00% [Member] | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2047-12
Current Principal/Notional Amount $ 4,394
Investment Interest Rate 4.00%
Fair Value $ 4,478
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Government National Mortgage Association Pools (30 Year) 6.00% [Member] | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Current Principal/Notional Amount $ 3,408
Investment Interest Rate 6.00%
Fair Value $ 3,666
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Government National Mortgage Association Pools (30 Year) 6.00% [Member] | Minimum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2048-05
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Government National Mortgage Association Pools (30 Year) 6.00% [Member] | Maximum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2048-11
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Federal Home Loan Mortgage Corporation Pools (Thirty Year) Three Percent [Member] | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Current Principal/Notional Amount $ 2,773
Investment Interest Rate 3.00%
Fair Value $ 2,722
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Federal Home Loan Mortgage Corporation Pools (Thirty Year) Three Percent [Member] | Minimum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2043-07
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Federal Home Loan Mortgage Corporation Pools (Thirty Year) Three Percent [Member] | Maximum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2045-06
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Federal National Mortgage Association Pools (Thirty Year) Three Percent [Member] | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Current Principal/Notional Amount $ 2,603
Investment Interest Rate 3.00%
Fair Value $ 2,556
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Federal National Mortgage Association Pools (Thirty Year) Three Percent [Member] | Minimum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2042-01
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Federal National Mortgage Association Pools (Thirty Year) Three Percent [Member] | Maximum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2045-06
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Government National Mortgage Association Pools (30 Year) 3.75% [Member] | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2047-07
Current Principal/Notional Amount $ 2,508
Investment Interest Rate 3.75%
Fair Value $ 2,537
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Federal Home Loan Mortgage Corporation Pools (Other) Four Point Five Percent [Member] | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2044-05
Current Principal/Notional Amount $ 2,348
Investment Interest Rate 4.50%
Fair Value $ 2,432
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Federal Home Loan Mortgage Corporation (15 Year) 3 Percent [Member] | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2030-04
Current Principal/Notional Amount $ 2,343
Investment Interest Rate 3.00%
Fair Value $ 2,342
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Federal National Mortgage Association Pools (Fifteen Year) Four Point Five Percent [Member] | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2026-04
Current Principal/Notional Amount $ 2,177
Investment Interest Rate 4.50%
Fair Value $ 2,265
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Federal National Mortgage Association Pools (Other) Four Point Five Percent [Member] | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2041-05
Current Principal/Notional Amount $ 2,025
Investment Interest Rate 4.50%
Fair Value $ 2,079
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Federal Home Loan Mortgage Corporation Pools (Thirty Year) Five Point Five Percent [Member] | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Current Principal/Notional Amount $ 1,677
Investment Interest Rate 5.50%
Fair Value $ 1,786
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Federal Home Loan Mortgage Corporation Pools (Thirty Year) Five Point Five Percent [Member] | Minimum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2033-08
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Federal Home Loan Mortgage Corporation Pools (Thirty Year) Five Point Five Percent [Member] | Maximum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2048-05
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Federal National Mortgage Association Pools (Twenty Year) Four Percent [Member] | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2033-12
Current Principal/Notional Amount $ 1,478
Investment Interest Rate 4.00%
Fair Value $ 1,526
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Federal Home Loan Mortgage Corporation Pools (Twenty Year) Four Point Five Percent [Member] | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2033-12
Current Principal/Notional Amount $ 976
Investment Interest Rate 4.50%
Fair Value $ 1,021
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Federal Home Loan Mortgage Corporation Pools (Fifteen Year) Four Percent [Member] | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2029-02
Current Principal/Notional Amount $ 886
Investment Interest Rate 4.00%
Fair Value $ 897
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Federal Home Loan Mortgage Corporation Pools (Thirty Year) Six Percent [Member] | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2040-05
Current Principal/Notional Amount $ 651
Investment Interest Rate 6.00%
Fair Value $ 697
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Government National Mortgage Association Pools (Thirty Year) Three Percent [Member] | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2042-11
Current Principal/Notional Amount $ 710
Investment Interest Rate 3.00%
Fair Value $ 695
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Federal National Mortgage Association Pools (Thirty Year) Six Percent [Member] | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Current Principal/Notional Amount $ 588
Investment Interest Rate 6.00%
Fair Value $ 631
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Federal National Mortgage Association Pools (Thirty Year) Six Percent [Member] | Minimum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2039-09
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Federal National Mortgage Association Pools (Thirty Year) Six Percent [Member] | Maximum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2040-02
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Government National Mortgage Association Pools (Thirty Year) Two Point Four Nine Percent [Member] | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2043-10
Current Principal/Notional Amount $ 524
Investment Interest Rate 2.49%
Fair Value $ 496
North America [Member] | Principal And Interest - Fixed Rate Agency Securities | Federal National Mortgage Association Pools (Thirty Year) Three Point Two Eight Percent [Member] | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2042-06
Current Principal/Notional Amount $ 109
Investment Interest Rate 3.28%
Fair Value $ 106
North America [Member] | Interest Only - Fixed Rate Agency Securities | Government National Mortgage Association 4.00% [Member] | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Current Principal/Notional Amount $ 17,505
Investment Interest Rate 4.00%
Fair Value $ 2,828
North America [Member] | Interest Only - Fixed Rate Agency Securities | Government National Mortgage Association 4.00% [Member] | Minimum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2045-02 [1],[3],[4]
North America [Member] | Interest Only - Fixed Rate Agency Securities | Government National Mortgage Association 4.00% [Member] | Maximum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2045-06 [1],[3],[4]
North America [Member] | Interest Only - Fixed Rate Agency Securities | Federal National Mortgage Association 4.50% [Member] | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Current Principal/Notional Amount $ 10,446
Investment Interest Rate 4.50%
Fair Value $ 1,223
North America [Member] | Interest Only - Fixed Rate Agency Securities | Federal National Mortgage Association 4.50% [Member] | Minimum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2020-12 [1],[3],[4]
North America [Member] | Interest Only - Fixed Rate Agency Securities | Federal National Mortgage Association 4.50% [Member] | Maximum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2044-06 [1],[3],[4]
North America [Member] | Interest Only - Fixed Rate Agency Securities | Government National Mortgage Association 6.00% [Member] | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Current Principal/Notional Amount $ 4,768
Investment Interest Rate 6.00%
Fair Value $ 978
North America [Member] | Interest Only - Fixed Rate Agency Securities | Government National Mortgage Association 6.00% [Member] | Minimum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2038-06 [1],[3],[4]
North America [Member] | Interest Only - Fixed Rate Agency Securities | Government National Mortgage Association 6.00% [Member] | Maximum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2039-08 [1],[3],[4]
North America [Member] | Interest Only - Fixed Rate Agency Securities | Government National Mortgage Association Four Point Five Percent [Member] | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Current Principal/Notional Amount $ 5,949
Investment Interest Rate 4.50%
Fair Value $ 808
North America [Member] | Interest Only - Fixed Rate Agency Securities | Government National Mortgage Association Four Point Five Percent [Member] | Minimum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2039-06 [1],[3],[4]
North America [Member] | Interest Only - Fixed Rate Agency Securities | Government National Mortgage Association Four Point Five Percent [Member] | Maximum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2044-07 [1],[3],[4]
North America [Member] | Interest Only - Fixed Rate Agency Securities | Federal National Mortgage Association Five Point Five Percent [Member] | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2039-10 [1],[3],[4]
Current Principal/Notional Amount $ 3,401
Investment Interest Rate 5.50%
Fair Value $ 749
North America [Member] | Interest Only - Fixed Rate Agency Securities | Government National Mortgage Association Five Point Five Percent [Member] | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2043-11 [1],[3],[4]
Current Principal/Notional Amount $ 3,612
Investment Interest Rate 5.50%
Fair Value $ 623
North America [Member] | Interest Only - Fixed Rate Agency Securities | Federal Home Loan Mortgage Corporation Three Point Five Percent [Member] | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2032-12 [1],[3],[4]
Current Principal/Notional Amount $ 3,642
Investment Interest Rate 3.50%
Fair Value $ 515
North America [Member] | Interest Only - Fixed Rate Agency Securities | Federal National Mortgage Association Four Percent [Member] | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Current Principal/Notional Amount $ 3,560
Investment Interest Rate 4.00%
Fair Value $ 513
North America [Member] | Interest Only - Fixed Rate Agency Securities | Federal National Mortgage Association Four Percent [Member] | Minimum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2039-05 [1],[3],[4]
North America [Member] | Interest Only - Fixed Rate Agency Securities | Federal National Mortgage Association Four Percent [Member] | Maximum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2043-11 [1],[3],[4]
North America [Member] | Interest Only - Fixed Rate Agency Securities | Federal National Mortgage Association Five Percent [Member] | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Current Principal/Notional Amount $ 2,659
Investment Interest Rate 5.00%
Fair Value $ 463
North America [Member] | Interest Only - Fixed Rate Agency Securities | Federal National Mortgage Association Five Percent [Member] | Minimum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2038-01 [1],[3],[4]
North America [Member] | Interest Only - Fixed Rate Agency Securities | Federal National Mortgage Association Five Percent [Member] | Maximum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2040-05 [1],[3],[4]
North America [Member] | Interest Only - Fixed Rate Agency Securities | Federal Home Loan Mortgage Corporation Five Percent [Member] | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2038-11 [1],[3],[4]
Current Principal/Notional Amount $ 5,122
Investment Interest Rate 5.00%
Fair Value $ 402
North America [Member] | Interest Only - Fixed Rate Agency Securities | Federal Home Loan Mortgage Corporation Five Point FIve Percent [Member] | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Current Principal/Notional Amount $ 3,749
Investment Interest Rate 5.50%
Fair Value $ 336
North America [Member] | Interest Only - Fixed Rate Agency Securities | Federal Home Loan Mortgage Corporation Five Point FIve Percent [Member] | Minimum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2039-01 [1],[3],[4]
North America [Member] | Interest Only - Fixed Rate Agency Securities | Federal Home Loan Mortgage Corporation Five Point FIve Percent [Member] | Maximum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2039-09 [1],[3],[4]
North America [Member] | Interest Only - Fixed Rate Agency Securities | Federal National Mortgage Association Six Percent [Member] | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2040-01 [1],[3],[4]
Current Principal/Notional Amount $ 1,613
Investment Interest Rate 6.00%
Fair Value $ 274
North America [Member] | Interest Only - Fixed Rate Agency Securities | Federal Home Loan Mortgage Corporation Four Point Five Percent [Member] | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2043-07 [1],[3],[4]
Current Principal/Notional Amount $ 1,463
Investment Interest Rate 4.50%
Fair Value $ 254
North America [Member] | Interest Only - Fixed Rate Agency Securities | Federal National Mortgage Association Three Percent [Member] | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2041-09 [1],[3],[4]
Current Principal/Notional Amount $ 2,291
Investment Interest Rate 3.00%
Fair Value $ 203
North America [Member] | Interest Only - Fixed Rate Agency Securities | Government National Mortgage Association Five Percent [Member] | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Current Principal/Notional Amount $ 3,043
Investment Interest Rate 5.00%
Fair Value $ 181
North America [Member] | Interest Only - Fixed Rate Agency Securities | Government National Mortgage Association Five Percent [Member] | Minimum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2037-05 [1],[3],[4]
North America [Member] | Interest Only - Fixed Rate Agency Securities | Government National Mortgage Association Five Percent [Member] | Maximum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2041-05 [1],[3],[4]
North America [Member] | Interest Only - Fixed Rate Agency Securities | Government National Mortgage Association Four Point Seven Five Percent [Member] | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2040-07 [1],[3],[4]
Current Principal/Notional Amount $ 842
Investment Interest Rate 4.75%
Fair Value $ 160
North America [Member] | TBA - Fixed Rate Agency Securities | Federal Home Loan Mortgage Corporation (15 Year) 3 Percent [Member] | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2019-01 [1],[3],[4]
Current Principal/Notional Amount $ 1,660
Investment Interest Rate 3.00%
Fair Value $ 1,655
North America [Member] | TBA - Fixed Rate Agency Securities | Government National Mortgage Association (30 Year) 5 Point 00 Percent [Member] | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2019-01 [1],[3],[4]
Current Principal/Notional Amount $ 299,455
Investment Interest Rate 5.00%
Fair Value $ 311,515
North America [Member] | TBA - Fixed Rate Agency Securities | Federal National Mortgage Association (30 Year) 4 Point 00 Percent [Member] | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2019-01 [1],[3],[4]
Current Principal/Notional Amount $ 122,003
Investment Interest Rate 4.00%
Fair Value $ 124,376
North America [Member] | TBA - Fixed Rate Agency Securities | Federal Home Loan Mortgage Corporation (30 Year) 3 Point 50 Percent [Member] | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2019-01 [1],[3],[4]
Current Principal/Notional Amount $ 21,540
Investment Interest Rate 3.50%
Fair Value $ 21,529
North America [Member] | TBA - Fixed Rate Agency Securities | Government National Mortgage Association (30 Year) 5 Point 50 Percent [Member] | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2019-01 [1],[3],[4]
Current Principal/Notional Amount $ 10,579
Investment Interest Rate 5.50%
Fair Value $ 11,058
North America [Member] | TBA - Fixed Rate Agency Securities | Government National Mortgage Association (30 Year) 3 Point 00 Percent [Member] | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2019-01 [1],[3],[4]
Current Principal/Notional Amount $ 4,800
Investment Interest Rate 3.00%
Fair Value $ 4,727
North America [Member] | Principal And Interest - Floating Rate Agency Securities | Government National Mortgage Association Pools [Member] | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Current Principal/Notional Amount 52,532
Fair Value $ 55,475
North America [Member] | Principal And Interest - Floating Rate Agency Securities | Government National Mortgage Association Pools [Member] | Minimum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2061-07 [1],[3],[4]
Investment Interest Rate 4.39% [1],[3],[4]
North America [Member] | Principal And Interest - Floating Rate Agency Securities | Government National Mortgage Association Pools [Member] | Maximum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2067-12 [1],[3],[4]
Investment Interest Rate 4.67% [1],[3],[4]
North America [Member] | Principal And Interest - Floating Rate Agency Securities | Federal National Mortgage Association Pools [Member] | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Current Principal/Notional Amount $ 3,515
Fair Value $ 3,650
North America [Member] | Principal And Interest - Floating Rate Agency Securities | Federal National Mortgage Association Pools [Member] | Minimum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2035-09 [1],[3],[4]
Investment Interest Rate 2.70% [1],[3],[4]
North America [Member] | Principal And Interest - Floating Rate Agency Securities | Federal National Mortgage Association Pools [Member] | Maximum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2045-05 [1],[3],[4]
Investment Interest Rate 4.69% [1],[3],[4]
North America [Member] | Principal And Interest - Floating Rate Agency Securities | Federal Home Loan Mortgage Corporation Pools [Member] | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Current Principal/Notional Amount $ 1,808
Fair Value $ 1,846
North America [Member] | Principal And Interest - Floating Rate Agency Securities | Federal Home Loan Mortgage Corporation Pools [Member] | Minimum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2037-06 [1],[3],[4]
Investment Interest Rate 3.49% [1],[3],[4]
North America [Member] | Principal And Interest - Floating Rate Agency Securities | Federal Home Loan Mortgage Corporation Pools [Member] | Maximum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2044-05 [1],[3],[4]
Investment Interest Rate 4.72% [1],[3],[4]
North America [Member] | Interest Only - Floating Rate Agency Securities [Member] | Government National Mortgage Association [Member] | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Current Principal/Notional Amount $ 228,763
Fair Value $ 10,772
North America [Member] | Interest Only - Floating Rate Agency Securities [Member] | Government National Mortgage Association [Member] | Minimum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2031-06 [1],[3],[4]
Investment Interest Rate 0.38% [1],[3],[4]
North America [Member] | Interest Only - Floating Rate Agency Securities [Member] | Government National Mortgage Association [Member] | Maximum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2066-10 [1],[3],[4]
Investment Interest Rate 5.64% [1],[3],[4]
North America [Member] | Interest Only - Floating Rate Agency Securities [Member] | Federal National Mortgage Association [Member] | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Current Principal/Notional Amount $ 70,568
Fair Value $ 4,880
North America [Member] | Interest Only - Floating Rate Agency Securities [Member] | Federal National Mortgage Association [Member] | Minimum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2033-06 [1],[3],[4]
Investment Interest Rate 1.13% [1],[3],[4]
North America [Member] | Interest Only - Floating Rate Agency Securities [Member] | Federal National Mortgage Association [Member] | Maximum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2046-11 [1],[3],[4]
Investment Interest Rate 5.50% [1],[3],[4]
North America [Member] | Interest Only - Floating Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation [Member] | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Current Principal/Notional Amount $ 48,699
Fair Value $ 3,256
North America [Member] | Interest Only - Floating Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation [Member] | Minimum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2036-03 [1],[3],[4]
Investment Interest Rate 1.55% [1],[3],[4]
North America [Member] | Interest Only - Floating Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation [Member] | Maximum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2044-01 [1],[3],[4]
Investment Interest Rate 4.19% [1],[3],[4]
North America [Member] | Interest Only - Floating Rate Agency Securities [Member] | Resecuritization of Government National Mortgage Association [Member] | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2060-08 [1],[3],[4],[8]
Current Principal/Notional Amount $ 5,220
Investment Interest Rate 2.21%
Fair Value $ 98
North America [Member] | Principal And Interest - Private Label Securities [Member]  
Schedule of Investments [Line Items]  
Investment owned as a percentage of equity 27.62% [2],[3],[4]
Fair Value $ 164,410
Investments at value, cost 153,769 [3],[4]
North America [Member] | Principal And Interest - Private Label Securities [Member] | Various Issuer [Member] | Mortgage-related Commercial  
Schedule of Investments [Line Items]  
Current Principal/Notional Amount 37,171
Fair Value 15,137
North America [Member] | Principal And Interest - Private Label Securities [Member] | Various Issuer [Member] | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Current Principal/Notional Amount 227,479
Fair Value $ 149,273
North America [Member] | Principal And Interest - Private Label Securities [Member] | Various Issuer [Member] | Minimum | Mortgage-related Commercial  
Schedule of Investments [Line Items]  
Investments maturity date 2049-03 [3],[4]
Investment Interest Rate 2.80% [3],[4]
North America [Member] | Principal And Interest - Private Label Securities [Member] | Various Issuer [Member] | Minimum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2019-05 [3],[4]
Investment Interest Rate 0.00% [3],[4]
North America [Member] | Principal And Interest - Private Label Securities [Member] | Various Issuer [Member] | Maximum | Mortgage-related Commercial  
Schedule of Investments [Line Items]  
Investments maturity date 2061-05 [3],[4]
Investment Interest Rate 3.29% [3],[4]
North America [Member] | Principal And Interest - Private Label Securities [Member] | Various Issuer [Member] | Maximum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2047-03 [3],[4]
Investment Interest Rate 24.56% [3],[4]
North America [Member] | Interest Only - Private Label Securities [Member] | Various Issuer [Member] | Mortgage-related Commercial  
Schedule of Investments [Line Items]  
Current Principal/Notional Amount $ 41,707
Fair Value 3,289
North America [Member] | Interest Only - Private Label Securities [Member] | Various Issuer [Member] | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Current Principal/Notional Amount 30,842
Fair Value $ 3,941
North America [Member] | Interest Only - Private Label Securities [Member] | Various Issuer [Member] | Minimum | Mortgage-related Commercial  
Schedule of Investments [Line Items]  
Investments maturity date 2049-03 [3],[4]
Investment Interest Rate 1.25% [3],[4]
North America [Member] | Interest Only - Private Label Securities [Member] | Various Issuer [Member] | Minimum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2030-12 [3],[4]
Investment Interest Rate 0.00% [3],[4]
North America [Member] | Interest Only - Private Label Securities [Member] | Various Issuer [Member] | Maximum | Mortgage-related Commercial  
Schedule of Investments [Line Items]  
Investments maturity date 2061-05 [3],[4]
Investment Interest Rate 2.00% [3],[4]
North America [Member] | Interest Only - Private Label Securities [Member] | Various Issuer [Member] | Maximum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2047-09 [3],[4]
Investment Interest Rate 2.00% [3],[4]
North America [Member] | Other Private Label Securities [Member] | Various Issuer [Member] | Mortgage-related Commercial  
Schedule of Investments [Line Items]  
Current Principal/Notional Amount $ 0
Investment Interest Rate 0.00%
Fair Value $ 0
North America [Member] | Other Private Label Securities [Member] | Various Issuer [Member] | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2037-06 [3],[4]
North America [Member] | Other Private Label Securities [Member] | Various Issuer [Member] | Minimum | Mortgage-related Commercial  
Schedule of Investments [Line Items]  
Investments maturity date 2045-07 [3],[4]
North America [Member] | Other Private Label Securities [Member] | Various Issuer [Member] | Maximum | Mortgage-related Commercial  
Schedule of Investments [Line Items]  
Investments maturity date 2061-05 [3],[4]
North America [Member] | CLOs  
Schedule of Investments [Line Items]  
Investment owned as a percentage of equity 20.82% [2],[3],[4],[9]
Fair Value $ 123,893
Investments at value, cost 139,424 [3],[4],[9]
North America [Member] | CLOs | Various Issuer [Member]  
Schedule of Investments [Line Items]  
Current Principal/Notional Amount 269,224
Fair Value $ 123,893
North America [Member] | CLOs | Various Issuer [Member] | Minimum  
Schedule of Investments [Line Items]  
Investments maturity date 2019-01 [3],[4],[9]
Investment Interest Rate 0.00% [3],[4],[9]
North America [Member] | CLOs | Various Issuer [Member] | Maximum  
Schedule of Investments [Line Items]  
Investments maturity date 2118-10 [3],[4],[9]
Investment Interest Rate 10.54% [3],[4],[9]
North America [Member] | Consumer loans and asset-backed securities backed by consumer loans  
Schedule of Investments [Line Items]  
Investment owned as a percentage of equity 34.59% [2],[3],[4],[5]
Fair Value $ 205,877
Investments at value, cost 211,221 [3],[4],[5]
North America [Member] | Consumer loans and asset-backed securities backed by consumer loans | Various Issuer [Member] | Consumer [Member]  
Schedule of Investments [Line Items]  
Current Principal/Notional Amount 233,602
Fair Value $ 205,877
North America [Member] | Consumer loans and asset-backed securities backed by consumer loans | Various Issuer [Member] | Minimum | Consumer [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2019-01 [3],[4],[5],[10],[11]
Investment Interest Rate 5.31% [3],[4],[5],[10],[11]
North America [Member] | Consumer loans and asset-backed securities backed by consumer loans | Various Issuer [Member] | Maximum | Consumer [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2023-12 [3],[4],[5],[10],[11]
Investment Interest Rate 76.50% [3],[4],[5],[10],[11]
North America [Member] | Corporate debt securities  
Schedule of Investments [Line Items]  
Investment owned as a percentage of equity 1.95% [2],[3],[4]
Fair Value $ 11,586
Investments at value, cost $ 11,949 [3],[4]
North America [Member] | Corporate debt securities | Various Issuer [Member] | Communications [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2022-05 [3],[4]
Current Principal/Notional Amount $ 938
Investment Interest Rate 0.00%
Fair Value $ 824
North America [Member] | Corporate debt securities | Various Issuer [Member] | Consumer [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2027-01 [3],[4]
Current Principal/Notional Amount $ 3,342
Investment Interest Rate 6.69%
Fair Value $ 3,141
North America [Member] | Corporate debt securities | Various Issuer [Member] | Energy [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2021-09 [3],[4]
Current Principal/Notional Amount $ 2,080
Investment Interest Rate 4.63%
Fair Value $ 1,877
North America [Member] | Corporate debt securities | Various Issuer [Member] | Industrial Sector [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2021-12 [3],[4]
Current Principal/Notional Amount $ 1,755
Investment Interest Rate 3.75%
Fair Value $ 1,742
North America [Member] | Corporate debt securities | Various Issuer [Member] | Technology Sector [Member]  
Schedule of Investments [Line Items]  
Current Principal/Notional Amount 4,570
Fair Value $ 4,002
North America [Member] | Corporate debt securities | Various Issuer [Member] | Minimum | Technology Sector [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2020-05 [3],[4]
North America [Member] | Corporate debt securities | Various Issuer [Member] | Maximum | Technology Sector [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2022-05 [3],[4]
North America [Member] | Secured notes | Various Issuer [Member] | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2057-11 [3],[4],[6]
Current Principal/Notional Amount $ 17,608
Investment Interest Rate 5.00% [3],[4],[6]
Fair Value $ 10,917
North America [Member] | Mortgage Loans [Member] | Various Issuer [Member] | Mortgage-related Commercial  
Schedule of Investments [Line Items]  
Current Principal/Notional Amount 235,459
Fair Value 211,185
North America [Member] | Mortgage Loans [Member] | Various Issuer [Member] | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Current Principal/Notional Amount 493,248
Fair Value $ 496,830
North America [Member] | Mortgage Loans [Member] | Various Issuer [Member] | Minimum | Mortgage-related Commercial  
Schedule of Investments [Line Items]  
Investments maturity date 2019-03 [3],[4],[5],[12]
Investment Interest Rate 4.31% [3],[4],[5],[12]
North America [Member] | Mortgage Loans [Member] | Various Issuer [Member] | Minimum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2019-03 [3],[4],[5],[13],[14]
Investment Interest Rate 2.00% [3],[4],[5],[13],[14]
North America [Member] | Mortgage Loans [Member] | Various Issuer [Member] | Maximum | Mortgage-related Commercial  
Schedule of Investments [Line Items]  
Investments maturity date 2037-10 [3],[4],[5],[12]
Investment Interest Rate 12.74% [3],[4],[5],[12]
North America [Member] | Mortgage Loans [Member] | Various Issuer [Member] | Maximum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2058-12 [3],[4],[5],[13],[14]
Investment Interest Rate 15.00% [3],[4],[5],[13],[14]
North America [Member] | Real estate owned | Single-Family Houses [Member] | Real estate-related [Member]  
Schedule of Investments [Line Items]  
Fair Value $ 1,296
Number of Real Estate Properties | property 5
North America [Member] | Real estate owned | Commercial Property [Member] | Real estate-related [Member]  
Schedule of Investments [Line Items]  
Fair Value $ 33,204
Number of Real Estate Properties | property 18
North America [Member] | Common stock  
Schedule of Investments [Line Items]  
Investment owned as a percentage of equity 0.37% [2],[3],[4]
Fair Value $ 2,200
Investments at value, cost 2,482 [3],[4]
North America [Member] | Common stock | Exchange Traded Equity [Member] | Consumer [Member]  
Schedule of Investments [Line Items]  
Fair Value $ 25
Investment Owned, Balance, Shares | shares 24
North America [Member] | Common stock | Exchange Traded Equity [Member] | Financial [Member]  
Schedule of Investments [Line Items]  
Fair Value $ 2,175
Investment Owned, Balance, Shares | shares 213
North America [Member] | Corporate equity securities  
Schedule of Investments [Line Items]  
Investment owned as a percentage of equity 7.36% [2],[3],[4]
Fair Value $ 43,789
Investments at value, cost 39,587 [3],[4]
North America [Member] | Corporate equity securities | Non-Exchange Traded Corporate Equity [Member] | Communications [Member]  
Schedule of Investments [Line Items]  
Fair Value $ 97
Investment Owned, Balance, Shares | shares 7
North America [Member] | Corporate equity securities | Non-Exchange Traded Corporate Equity [Member] | Consumer [Member]  
Schedule of Investments [Line Items]  
Fair Value $ 0
Investment Owned, Balance, Shares | shares 1,540
North America [Member] | Corporate equity securities | Non-Exchange Traded Corporate Equity [Member] | Diversified [Member]  
Schedule of Investments [Line Items]  
Fair Value $ 1,433
Investment Owned, Balance, Shares | shares 144
North America [Member] | Corporate equity securities | Investment in unconsolidated entities | Consumer [Member]  
Schedule of Investments [Line Items]  
Fair Value $ 4,045
North America [Member] | Corporate equity securities | Non-Exchange Traded Preferred Equity Investment in Consumer Loan Originators [Member] [Domain] | Consumer [Member]  
Schedule of Investments [Line Items]  
Fair Value $ 3,000
Investment Owned, Balance, Shares | shares 3,000
North America [Member] | Corporate equity securities | Non-controlling Interest in Mortgage-related Private Partnership | Mortgage-related Commercial  
Schedule of Investments [Line Items]  
Fair Value $ 1,147
North America [Member] | Corporate equity securities | Non-Exchange Traded Preferred Equity Investment in Mortgage Originators [Member] | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Fair Value $ 27,317
Investment Owned, Balance, Shares | shares 23
North America [Member] | Corporate equity securities | Non-Exchange Traded Equity Investment in Mortgage Originators [Member] | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Fair Value $ 6,750
Investment Owned, Balance, Shares | shares 9,818
North America [Member] | U.S. Treasury securities | U.S. Treasury Note, 2.75 Percent, Maturity Date 2023 04 [Member] | Government [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2023-04 [3],[4]
Current Principal/Notional Amount $ 75
Investment Interest Rate 2.75%
Fair Value $ 76
Europe [Member] | Principal And Interest - Private Label Securities [Member]  
Schedule of Investments [Line Items]  
Investment owned as a percentage of equity 27.71% [2],[3],[4]
Fair Value $ 164,907
Investments at value, cost 172,661 [3],[4]
Europe [Member] | Principal And Interest - Private Label Securities [Member] | Various Issuer [Member] | Mortgage-related Commercial  
Schedule of Investments [Line Items]  
Current Principal/Notional Amount 24,978
Fair Value 15,482
Europe [Member] | Principal And Interest - Private Label Securities [Member] | Various Issuer [Member] | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Current Principal/Notional Amount 183,154
Fair Value $ 149,425
Europe [Member] | Principal And Interest - Private Label Securities [Member] | Various Issuer [Member] | Minimum | Mortgage-related Commercial  
Schedule of Investments [Line Items]  
Investments maturity date 2020-10 [3],[4]
Investment Interest Rate 0.38% [3],[4]
Europe [Member] | Principal And Interest - Private Label Securities [Member] | Various Issuer [Member] | Minimum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2025-06 [3],[4]
Investment Interest Rate 0.00% [3],[4]
Europe [Member] | Principal And Interest - Private Label Securities [Member] | Various Issuer [Member] | Maximum | Mortgage-related Commercial  
Schedule of Investments [Line Items]  
Investments maturity date 2045-08 [3],[4]
Investment Interest Rate 4.29% [3],[4]
Europe [Member] | Principal And Interest - Private Label Securities [Member] | Various Issuer [Member] | Maximum | Mortgage-related Residential [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2052-12 [3],[4]
Investment Interest Rate 5.50% [3],[4]
Europe [Member] | Consumer loans and asset-backed securities backed by consumer loans  
Schedule of Investments [Line Items]  
Investment owned as a percentage of equity 0.15% [2],[3],[4],[5]
Fair Value $ 884
Investments at value, cost $ 761 [3],[4],[5]
Europe [Member] | Consumer loans and asset-backed securities backed by consumer loans | Various Issuer [Member] | Consumer [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2030-12 [3],[4],[5]
Current Principal/Notional Amount $ 3,540
Investment Interest Rate 0.00%
Fair Value $ 884
Europe [Member] | Corporate debt securities  
Schedule of Investments [Line Items]  
Investment owned as a percentage of equity 1.81% [2],[3],[4]
Fair Value $ 10,806
Investments at value, cost $ 12,319 [3],[4]
Europe [Member] | Corporate debt securities | Various Issuer [Member] | Consumer [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2019-12 [3],[4]
Current Principal/Notional Amount $ 20,574
Investment Interest Rate 0.00%
Fair Value $ 0
Europe [Member] | Corporate debt securities | Various Issuer [Member] | Financial [Member]  
Schedule of Investments [Line Items]  
Current Principal/Notional Amount 11,235
Fair Value $ 10,806
Europe [Member] | Corporate debt securities | Various Issuer [Member] | Minimum | Financial [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2020-10 [3],[4]
Investment Interest Rate 0.00% [3],[4]
Europe [Member] | Corporate debt securities | Various Issuer [Member] | Minimum | Technology Sector [Member]  
Schedule of Investments [Line Items]  
Investment Interest Rate 0.00% [3],[4]
Europe [Member] | Corporate debt securities | Various Issuer [Member] | Maximum | Financial [Member]  
Schedule of Investments [Line Items]  
Investments maturity date 2022-11 [3],[4]
Investment Interest Rate 16.00% [3],[4]
Europe [Member] | Corporate debt securities | Various Issuer [Member] | Maximum | Technology Sector [Member]  
Schedule of Investments [Line Items]  
Investment Interest Rate 4.38% [3],[4]
Europe [Member] | Corporate equity securities  
Schedule of Investments [Line Items]  
Investment owned as a percentage of equity 0.00% [2],[3],[4]
Fair Value $ 4
Investments at value, cost 5 [3],[4]
Europe [Member] | Corporate equity securities | Non-Exchange Traded Corporate Equity [Member] | Consumer [Member]  
Schedule of Investments [Line Items]  
Fair Value $ 0
Investment Owned, Balance, Shares | shares 125
Europe [Member] | Corporate equity securities | Non-Exchange Traded Corporate Equity [Member] | Financial [Member]  
Schedule of Investments [Line Items]  
Fair Value $ 4
Investment Owned, Balance, Shares | shares 0
[1]
At December 31, 2018, the Company's long investments guaranteed by the Federal National Mortgage Association, the Federal Home Loan Mortgage Corporation, and the Government National Mortgage Association, represented 93.99%, 42.12%, and 107.55% of Total Equity, respectively.
[2]
Classification percentages are based on Total Equity.
[3]
See Note 2 and Note 3 in Notes to Consolidated Financial Statements.
[4]
The table below shows the Company's long investment ratings from Moody's, Standard and Poor's, or Fitch, as well as the Company's long investments that were unrated but guaranteed by the Federal National Mortgage Association, the Federal Home Loan Mortgage Corporation, or the Government National Mortgage Association. Ratings tend to be a lagging credit indicator; as a result, the credit quality of the Company's long investment holdings may be lower than the credit quality implied based on the ratings listed below. In situations where an investment has a split rating, the lowest provided rating is used. The ratings descriptions include ratings qualified with a "+," "-," "1," "2," or "3."
Rating Description
 
Percent of Equity
Unrated but Agency-Guaranteed
 
243.66
%
Aaa/AAA/AAA
 
0.01
%
Aa/AA/AA
 
0.63
%
A/A/A
 
4.73
%
Baa/BBB/BBB
 
1.84
%
Ba/BB/BB or below
 
46.34
%
Unrated
 
196.65
%

[5] Loans and real estate owned are beneficially owned by the Company through participation certificates in the various trusts that hold such investments. See Note 9 to the Notes to Consolidated Financial Statements.
[6] Represents the Company's investment in a related party. See Note 9 to the Notes to Consolidated Financial Statements
[7]
Number of properties not shown in thousands, represents actual number of properties owned.
[8]
Private trust 100% backed by interest in Government National Mortgage Association collateralized mortgage obligation certificates.
[9]
Includes investment in collateralized loan obligation notes in the amount of $50.8 million that were issued and are managed by related parties of the Company. See Note 9 to the Notes to Consolidated Financial Statements.
[10]
Includes investments in participation certificates related to loans held in a trust owned by a related party of Ellington Management Group, L.L.C. Through its participation certificates, the Company participates in the cash flows of the underlying loans held by the trust. At December 31, 2018 loans held in the related party trust for which the Company has participating interests in the cash flows, totaled $181.5 million. See Note 9 to the Notes to Consolidated Financial Statements.
[11]
Includes investments in participation certificates related to loans titled in the name of a related party of Ellington Management Group, L.L.C. Through its participation certificates, the Company has beneficial interests in the loan cash flows, net of servicing-related fees and expenses. At December 31, 2018 loans for which the Company has beneficial interests in the net cash flows, totaled $21.9 million. See Note 9 to the Notes to Consolidated Financial Statements.
[12] Includes non-performing commercial mortgage loans in the amount of $47.3 million whereby principal and/or interest is past due and a maturity date is not applicable.
[13]
As of December 31, 2018, the Company had residential mortgage loans that were in the process of foreclosure with a fair value of $9.1 million.
[14]
Includes $314.2 million of non-qualified mortgage loans that have been securitized and are held in a consolidated securitization trusts. See Note 6 to the Notes to Consolidated Financial Statements.