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Consolidated Condensed Schedule Of Investments (Long Investments) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Schedule of Investments [Line Items]    
Fair Value $ 1,756,011,000 $ 1,730,130,000
Investment Owned, at Cost 1,713,189,000 1,688,257,000
Percentage collaterallized by GNRCMO certificates 100.00% 100.00%
Non-performing loans, maturity date not applicable 20,000,000  
Unrated But Agency-Guaranteed [Member]
    
Schedule of Investments [Line Items]    
Long investment holdings as a percentage of stockholders' equity 177.47% 164.58%
Long Investment A Rating [Member]
    
Schedule of Investments [Line Items]    
Long investment holdings as a percentage of stockholders' equity 0.03% 0.34%
Long Investment BBB Rating [Member]
    
Schedule of Investments [Line Items]    
Long investment holdings as a percentage of stockholders' equity 2.31% 2.97%
Long Investment BB Rating [Member]
    
Schedule of Investments [Line Items]    
Long investment holdings as a percentage of stockholders' equity 84.29% 97.95%
Long Investment Unrated Rating [Member]
    
Schedule of Investments [Line Items]    
Long investment holdings as a percentage of stockholders' equity 14.60% 10.52%
Principal And Interest - Fixed Rate Agency Securities [Member]
    
Schedule of Investments [Line Items]    
Investment owned as a percentage of equity 135.58% [1],[2],[3],[4],[5] 137.75% [1],[2],[6],[7],[8]
Fair Value 854,263,000 [2],[3],[4],[5] 862,368,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 27,333 Federal National Mortgage Association Pool 3.50% 2042-10 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 27,333,000 [2],[3],[4],[5]  
Investment Owned Description Federal National Mortgage Association Pool [2],[3],[4],[5]  
Rate 3.50% [2],[3],[4],[5]  
Maturity 2042-10 [2],[3],[4],[5]  
Fair Value 27,569,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 17,661 Federal National Mortgage Association Pool 4.00% 2043-11 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 17,661,000 [2],[3],[4],[5]  
Investment Owned Description Federal National Mortgage Association Pool [2],[3],[4],[5]  
Rate 4.00% [2],[3],[4],[5]  
Maturity 2043-11 [2],[3],[4],[5]  
Fair Value 18,426,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 15,466 Federal National Mortgage Association Pool 5.00% 2041-08 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 15,466,000 [2],[3],[4],[5]  
Investment Owned Description Federal National Mortgage Association Pool [2],[3],[4],[5]  
Rate 5.00% [2],[3],[4],[5]  
Maturity 2041-08 [2],[3],[4],[5]  
Fair Value 16,911,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 16,303 Federal National Mortgage Association Pool 3.00% 2028-06 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 16,303,000 [2],[3],[4],[5]  
Investment Owned Description Federal National Mortgage Association Pool [2],[3],[4],[5]  
Rate 3.00% [2],[3],[4],[5]  
Maturity 2028-06 [2],[3],[4],[5]  
Fair Value 16,602,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 14,986 Federal National Mortgage Association Pool 5.0% 2044-01 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 14,986,000 [2],[3],[4],[5]  
Investment Owned Description Federal National Mortgage Association Pool [2],[3],[4],[5]  
Rate 5.00% [2],[3],[4],[5]  
Maturity 2044-01 [2],[3],[4],[5]  
Fair Value 16,396,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 15,695 Federal National Mortgage Association Pool 4.00% 2043-11 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 15,695,000 [2],[3],[4],[5]  
Investment Owned Description Federal National Mortgage Association Pool [2],[3],[4],[5]  
Rate 4.00% [2],[3],[4],[5]  
Maturity 2043-11 [2],[3],[4],[5]  
Fair Value 16,360,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 13,081 Federal Home Loan Mortgage Corporation Pool 4.00% 2043-08 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 13,081,000 [2],[3],[4],[5]  
Investment Owned Description Federal Home Loan Mortgage Corporation Pool [2],[3],[4],[5]  
Rate 4.00% [2],[3],[4],[5]  
Maturity 2043-08 [2],[3],[4],[5]  
Fair Value 13,637,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 12,517 Federal Home Loan Mortgage Corporation Pool 4.50% 2044-01 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 12,517,000 [2],[3],[4],[5]  
Investment Owned Description Federal Home Loan Mortgage Corporation Pool [2],[3],[4],[5]  
Rate 4.50% [2],[3],[4],[5]  
Maturity 2044-01 [2],[3],[4],[5]  
Fair Value 13,459,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 11,988 Federal National Mortgage Association Pool 5.00% 2041-03 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 11,988,000 [2],[3],[4],[5]  
Investment Owned Description Federal National Mortgage Association Pool [2],[3],[4],[5]  
Rate 5.00% [2],[3],[4],[5]  
Maturity 2041-03 [2],[3],[4],[5]  
Fair Value 13,189,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 11,250 Federal National Mortgage Association Pool 4.50% 2043-10 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 11,250,000 [2],[3],[4],[5]  
Investment Owned Description Federal National Mortgage Association Pool [2],[3],[4],[5]  
Rate 4.50% [2],[3],[4],[5]  
Maturity 2043-10 [2],[3],[4],[5]  
Fair Value 12,014,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 11,261 Federal National Mortgage Association Pool 4.00% 2043-10 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 11,261,000 [2],[3],[4],[5]  
Investment Owned Description Federal National Mortgage Association Pool [2],[3],[4],[5]  
Rate 4.00% [2],[3],[4],[5]  
Maturity 2043-10 [2],[3],[4],[5]  
Fair Value 11,747,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 9,642 Federal Home Loan Mortgage Corporation Pool 4.00% 2043-07 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 9,642,000 [2],[3],[4],[5]  
Investment Owned Description Federal Home Loan Mortgage Corporation Pool [2],[3],[4],[5]  
Rate 4.00% [2],[3],[4],[5]  
Maturity 2043-07 [2],[3],[4],[5]  
Fair Value 10,021,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 9,159 Federal National Mortgage Association Pool 4.50% 2044-02 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 9,159,000 [2],[3],[4],[5]  
Investment Owned Description Federal National Mortgage Association Pool [2],[3],[4],[5]  
Rate 4.50% [2],[3],[4],[5]  
Maturity 2044-02 [2],[3],[4],[5]  
Fair Value 9,789,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 9,075 Federal National Mortgage Association Pool 4.00% 2043-08 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 9,075,000 [2],[3],[4],[5]  
Investment Owned Description Federal National Mortgage Association Pool [2],[3],[4],[5]  
Rate 4.00% [2],[3],[4],[5]  
Maturity 2043-08 [2],[3],[4],[5]  
Fair Value 9,448,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 8,943 Federal National Mortgage Association Pool 4.00% 2043-12 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 8,943,000 [2],[3],[4],[5]  
Investment Owned Description Federal National Mortgage Association Pool [2],[3],[4],[5]  
Rate 4.00% [2],[3],[4],[5]  
Maturity 2043-12 [2],[3],[4],[5]  
Fair Value 9,330,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 8,752 Federal National Mortgage Association Pool 4.00% 2043-11 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 8,752,000 [2],[3],[4],[5]  
Investment Owned Description Federal National Mortgage Association Pool [2],[3],[4],[5]  
Rate 4.00% [2],[3],[4],[5]  
Maturity 2043-11 [2],[3],[4],[5]  
Fair Value 9,093,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 7,264 Federal National Mortgage Association Pool 3.50% 2028-03 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 7,264,000 [2],[3],[4],[5]  
Investment Owned Description Federal National Mortgage Association Pool [2],[3],[4],[5]  
Rate 3.50% [2],[3],[4],[5]  
Maturity 2028-03 [2],[3],[4],[5]  
Fair Value 7,636,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 7,062 Federal National Mortgage Association Pool 4.50% 2026-04 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 7,062,000 [2],[3],[4],[5]  
Investment Owned Description Federal National Mortgage Association Pool [2],[3],[4],[5]  
Rate 4.50% [2],[3],[4],[5]  
Maturity 2026-04 [2],[3],[4],[5]  
Fair Value 7,496,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 6,761 Federal National Mortgage Association Pool 5.00% 2044-03 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 6,761,000 [2],[3],[4],[5]  
Investment Owned Description Federal National Mortgage Association Pool [2],[3],[4],[5]  
Rate 5.00% [2],[3],[4],[5]  
Maturity 2044-03 [2],[3],[4],[5]  
Fair Value 7,431,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 7,260 Federal National Mortgage Association Pool 3.50% 2042-11 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 7,260,000 [2],[3],[4],[5]  
Investment Owned Description Federal National Mortgage Association Pool [2],[3],[4],[5]  
Rate 3.50% [2],[3],[4],[5]  
Maturity 2042-11 [2],[3],[4],[5]  
Fair Value 7,332,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 6,691 Federal National Mortgage Association Pool 4.50% 2043-10 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 6,691,000 [2],[3],[4],[5]  
Investment Owned Description Federal National Mortgage Association Pool [2],[3],[4],[5]  
Rate 4.50% [2],[3],[4],[5]  
Maturity 2043-10 [2],[3],[4],[5]  
Fair Value 7,162,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 6,612 Federal Home Loan Mortgage Corporation Pool 4.50% 2044-02 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 6,612,000 [2],[3],[4],[5]  
Investment Owned Description Federal Home Loan Mortgage Corporation Pool [2],[3],[4],[5]  
Rate 4.50% [2],[3],[4],[5]  
Maturity 2044-02 [2],[3],[4],[5]  
Fair Value 7,111,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 6,819 Federal Home Loan Mortgage Corporation Pool 4.00% 2043-10 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 6,819,000 [2],[3],[4],[5]  
Investment Owned Description Federal Home Loan Mortgage Corporation Pool [2],[3],[4],[5]  
Rate 4.00% [2],[3],[4],[5]  
Maturity 2043-10 [2],[3],[4],[5]  
Fair Value 7,072,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 6,050 Federal National Mortgage Association Pool 5.50% 2039-10 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 6,050,000 [2],[3],[4],[5]  
Investment Owned Description Federal National Mortgage Association Pool [2],[3],[4],[5]  
Rate 5.50% [2],[3],[4],[5]  
Maturity 2039-10 [2],[3],[4],[5]  
Fair Value 6,677,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 5,993 Federal National Mortgage Association Pool 4.00% 2043-08 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 5,993,000 [2],[3],[4],[5]  
Investment Owned Description Federal National Mortgage Association Pool [2],[3],[4],[5]  
Rate 4.00% [2],[3],[4],[5]  
Maturity 2043-08 [2],[3],[4],[5]  
Fair Value 6,260,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 5,688 Government National Mortgage Association Pool 4.46% 2063-02 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 5,688,000 [2],[3],[4],[5]  
Investment Owned Description Government National Mortgage Association Pool [2],[3],[4],[5]  
Rate 4.46% [2],[3],[4],[5]  
Maturity 2063-02 [2],[3],[4],[5]  
Fair Value 6,239,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 5,733 Federal National Mortgage Association Pool 4.50% 2044-02 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 5,733,000 [2],[3],[4],[5]  
Investment Owned Description Federal National Mortgage Association Pool [2],[3],[4],[5]  
Rate 4.50% [2],[3],[4],[5]  
Maturity 2044-02 [2],[3],[4],[5]  
Fair Value 6,165,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 5,865 Federal Home Loan Mortgage Corporation Pool 4.00% 2043-08 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 5,865,000 [2],[3],[4],[5]  
Investment Owned Description Federal Home Loan Mortgage Corporation Pool [2],[3],[4],[5]  
Rate 4.00% [2],[3],[4],[5]  
Maturity 2043-08 [2],[3],[4],[5]  
Fair Value 6,108,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 5,863 Federal National Mortgage Association Pool 4.00% 2043-08 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 5,863,000 [2],[3],[4],[5]  
Investment Owned Description Federal National Mortgage Association Pool [2],[3],[4],[5]  
Rate 4.00% [2],[3],[4],[5]  
Maturity 2043-08 [2],[3],[4],[5]  
Fair Value 6,105,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 6,294 Federal National Mortgage Association Pool 3.00% 2042-10 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 6,294,000 [2],[3],[4],[5]  
Investment Owned Description Federal National Mortgage Association Pool [2],[3],[4],[5]  
Rate 3.00% [2],[3],[4],[5]  
Maturity 2042-10 [2],[3],[4],[5]  
Fair Value 6,092,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 6,244 Federal National Mortgage Association Pool 3.00% 2042-04 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 6,244,000 [2],[3],[4],[5]  
Investment Owned Description Federal National Mortgage Association Pool [2],[3],[4],[5]  
Rate 3.00% [2],[3],[4],[5]  
Maturity 2042-04 [2],[3],[4],[5]  
Fair Value 6,053,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 5,790 Federal Home Loan Mortgage Corporation Pool 4.00% 2044-01 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 5,790,000 [2],[3],[4],[5]  
Investment Owned Description Federal Home Loan Mortgage Corporation Pool [2],[3],[4],[5]  
Rate 4.00% [2],[3],[4],[5]  
Maturity 2044-01 [2],[3],[4],[5]  
Fair Value 6,030,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 5,430 Federal National Mortgage Association Pool 5.00% 2044-03 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 5,430,000 [2],[3],[4],[5]  
Investment Owned Description Federal National Mortgage Association Pool [2],[3],[4],[5]  
Rate 5.00% [2],[3],[4],[5]  
Maturity 2044-03 [2],[3],[4],[5]  
Fair Value 5,973,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 5,647 Federal National Mortgage Association Pool 3.50% 2028-12 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 5,647,000 [2],[3],[4],[5]  
Investment Owned Description Federal National Mortgage Association Pool [2],[3],[4],[5]  
Rate 3.50% [2],[3],[4],[5]  
Maturity 2028-12 [2],[3],[4],[5]  
Fair Value 5,932,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 5,392 Federal National Mortgage Association Pool 5.00% 2043-10 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 5,392,000 [2],[3],[4],[5]  
Investment Owned Description Federal National Mortgage Association Pool [2],[3],[4],[5]  
Rate 5.00% [2],[3],[4],[5]  
Maturity 2043-10 [2],[3],[4],[5]  
Fair Value 5,904,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 5,676 Federal Home Loan Mortgage Corporation Pool, 4.00% 2043-08 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 5,676,000 [2],[3],[4],[5]  
Investment Owned Description Federal Home Loan Mortgage Corporation Pool [2],[3],[4],[5]  
Rate 4.00% [2],[3],[4],[5]  
Maturity 2043-08 [2],[3],[4],[5]  
Fair Value 5,899,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 6,059 Federal Home Loan Mortgage Corporation Pool 3.00% 2043-01 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 6,059,000 [2],[3],[4],[5]  
Investment Owned Description Federal Home Loan Mortgage Corporation Pool [2],[3],[4],[5]  
Rate 3.00% [2],[3],[4],[5]  
Maturity 2043-01 [2],[3],[4],[5]  
Fair Value 5,862,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 5,298 Government National Mortgage Association Pool 4.54% 2062-11 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 5,298,000 [2],[3],[4],[5]  
Investment Owned Description Government National Mortgage Association Pool [2],[3],[4],[5]  
Rate 4.54% [2],[3],[4],[5]  
Maturity 2062-11 [2],[3],[4],[5]  
Fair Value 5,816,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 5,248 Government National Mortgage Association Pool 4.60% 2062-06 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 5,248,000 [2],[3],[4],[5]  
Investment Owned Description Government National Mortgage Association Pool [2],[3],[4],[5]  
Rate 4.60% [2],[3],[4],[5]  
Maturity 2062-06 [2],[3],[4],[5]  
Fair Value 5,755,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 5,221 Government National Mortgage Association Pool 4.63% 2061-06 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 5,221,000 [2],[3],[4],[5]  
Investment Owned Description Government National Mortgage Association Pool [2],[3],[4],[5]  
Rate 4.63% [2],[3],[4],[5]  
Maturity 2061-06 [2],[3],[4],[5]  
Fair Value 5,686,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 5,316 Federal National Mortgage Association Pool 4.50% 2043-11 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 5,316,000 [2],[3],[4],[5]  
Investment Owned Description Federal National Mortgage Association Pool [2],[3],[4],[5]  
Rate 4.50% [2],[3],[4],[5]  
Maturity 2043-11 [2],[3],[4],[5]  
Fair Value 5,683,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 5,160 Federal National Mortgage Association Pool 4.50% 2043-12 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 5,160,000 [2],[3],[4],[5]  
Investment Owned Description Federal National Mortgage Association Pool [2],[3],[4],[5]  
Rate 4.50% [2],[3],[4],[5]  
Maturity 2043-12 [2],[3],[4],[5]  
Fair Value 5,553,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 5,175 Federal National Mortgage Association Pool 4.00% 2044-03 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 5,175,000 [2],[3],[4],[5]  
Investment Owned Description Federal National Mortgage Association Pool [2],[3],[4],[5]  
Rate 4.00% [2],[3],[4],[5]  
Maturity 2044-03 [2],[3],[4],[5]  
Fair Value 5,398,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 5,089 Federal National Mortgage Association Pool 4.00% 2044-01 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 5,089,000 [2],[3],[4],[5]  
Investment Owned Description Federal National Mortgage Association Pool [2],[3],[4],[5]  
Rate 4.00% [2],[3],[4],[5]  
Maturity 2044-01 [2],[3],[4],[5]  
Fair Value 5,316,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,728 Federal National Mortgage Association Pool 4.50% 2044-01 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 4,728,000 [2],[3],[4],[5]  
Investment Owned Description Federal National Mortgage Association Pool [2],[3],[4],[5]  
Rate 4.50% [2],[3],[4],[5]  
Maturity 2044-01 [2],[3],[4],[5]  
Fair Value 5,084,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,883 Federal National Mortgage Association Pool 4.00% 2043-01 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 4,883,000 [2],[3],[4],[5]  
Investment Owned Description Federal National Mortgage Association Pool [2],[3],[4],[5]  
Rate 4.00% [2],[3],[4],[5]  
Maturity 2043-01 [2],[3],[4],[5]  
Fair Value 5,084,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,625 Federal National Mortgage Association Pool 5.00% 2044-01 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 4,625,000 [2],[3],[4],[5]  
Investment Owned Description Federal National Mortgage Association Pool [2],[3],[4],[5]  
Rate 5.00% [2],[3],[4],[5]  
Maturity 2044-01 [2],[3],[4],[5]  
Fair Value 5,065,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,751 Federal National Mortgage Association Pool 4.00% 2026-07 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 4,751,000 [2],[3],[4],[5]  
Investment Owned Description Federal National Mortgage Association Pool [2],[3],[4],[5]  
Rate 4.00% [2],[3],[4],[5]  
Maturity 2026-07 [2],[3],[4],[5]  
Fair Value 5,028,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,722 Federal National Mortgage Association Pool 4.00% 2044-04 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 4,722,000 [2],[3],[4],[5]  
Investment Owned Description Federal National Mortgage Association Pool [2],[3],[4],[5]  
Rate 4.00% [2],[3],[4],[5]  
Maturity 2044-04 [2],[3],[4],[5]  
Fair Value 4,922,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,694 Federal National Mortgage Association Pool 4.00% 2042-04 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 4,694,000 [2],[3],[4],[5]  
Investment Owned Description Federal National Mortgage Association Pool [2],[3],[4],[5]  
Rate 4.00% [2],[3],[4],[5]  
Maturity 2042-04 [2],[3],[4],[5]  
Fair Value 4,891,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,451 Federal National Mortgage Association Pool 4.50% 2043-10 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 4,451,000 [2],[3],[4],[5]  
Investment Owned Description Federal National Mortgage Association Pool [2],[3],[4],[5]  
Rate 4.50% [2],[3],[4],[5]  
Maturity 2043-10 [2],[3],[4],[5]  
Fair Value 4,791,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,459 Federal National Mortgage Association Pool 4.50% 2043-08 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 4,459,000 [2],[3],[4],[5]  
Investment Owned Description Federal National Mortgage Association Pool [2],[3],[4],[5]  
Rate 4.50% [2],[3],[4],[5]  
Maturity 2043-08 [2],[3],[4],[5]  
Fair Value 4,767,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,548 Federal Home Loan Mortgage Corporation Pool 4.00% 2044-02 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 4,548,000 [2],[3],[4],[5]  
Investment Owned Description Federal Home Loan Mortgage Corporation Pool [2],[3],[4],[5]  
Rate 4.00% [2],[3],[4],[5]  
Maturity 2044-02 [2],[3],[4],[5]  
Fair Value 4,742,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,560 Federal Home Loan Mortgage Corporation Pool 4.00% 2043-08 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 4,560,000 [2],[3],[4],[5]  
Investment Owned Description Federal Home Loan Mortgage Corporation Pool [2],[3],[4],[5]  
Rate 4.00% [2],[3],[4],[5]  
Maturity 2043-08 [2],[3],[4],[5]  
Fair Value 4,739,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,362 Government National Mortgage Association Pool 4.75% 2061-01 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 4,362,000 [2],[3],[4],[5]  
Investment Owned Description Government National Mortgage Association Pool [2],[3],[4],[5]  
Rate 4.75% [2],[3],[4],[5]  
Maturity 2061-01 [2],[3],[4],[5]  
Fair Value 4,730,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,505 Federal National Mortgage Association Pool 4.00% 2043-11 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 4,505,000 [2],[3],[4],[5]  
Investment Owned Description Federal National Mortgage Association Pool [2],[3],[4],[5]  
Rate 4.00% [2],[3],[4],[5]  
Maturity 2043-11 [2],[3],[4],[5]  
Fair Value 4,699,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,343 Federal Home Loan Mortgage Corporation Pool 4.50% 2043-09 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 4,343,000 [2],[3],[4],[5]  
Investment Owned Description Federal Home Loan Mortgage Corporation Pool [2],[3],[4],[5]  
Rate 4.50% [2],[3],[4],[5]  
Maturity 2043-09 [2],[3],[4],[5]  
Fair Value 4,638,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,268 Federal National Mortgage Association Pool 4.50% 2044-03 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 4,268,000 [2],[3],[4],[5]  
Investment Owned Description Federal National Mortgage Association Pool [2],[3],[4],[5]  
Rate 4.50% [2],[3],[4],[5]  
Maturity 2044-03 [2],[3],[4],[5]  
Fair Value 4,576,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,165 Federal National Mortgage Association Pool 5.00% 2043-11 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 4,165,000 [2],[3],[4],[5]  
Investment Owned Description Federal National Mortgage Association Pool [2],[3],[4],[5]  
Rate 5.00% [2],[3],[4],[5]  
Maturity 2043-11 [2],[3],[4],[5]  
Fair Value 4,560,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,044 Federal National Mortgage Association Pool 5.00% 2043-10 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 4,044,000 [2],[3],[4],[5]  
Investment Owned Description Federal National Mortgage Association Pool [2],[3],[4],[5]  
Rate 5.00% [2],[3],[4],[5]  
Maturity 2043-10 [2],[3],[4],[5]  
Fair Value 4,421,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,215 Federal National Mortgage Association Pool 4.00% 2043-11 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 4,215,000 [2],[3],[4],[5]  
Investment Owned Description Federal National Mortgage Association Pool [2],[3],[4],[5]  
Rate 4.00% [2],[3],[4],[5]  
Maturity 2043-11 [2],[3],[4],[5]  
Fair Value 4,397,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,160 Federal Home Loan Mortgage Corporation Pool 3.50% 2029-02 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 4,160,000 [2],[3],[4],[5]  
Investment Owned Description Federal Home Loan Mortgage Corporation Pool [2],[3],[4],[5]  
Rate 3.50% [2],[3],[4],[5]  
Maturity 2029-02 [2],[3],[4],[5]  
Fair Value 4,362,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,922 Government National Mortgage Association Pool 4.69% 2061-07 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 3,922,000 [2],[3],[4],[5]  
Investment Owned Description Government National Mortgage Association Pool [2],[3],[4],[5]  
Rate 4.69% [2],[3],[4],[5]  
Maturity 2061-07 [2],[3],[4],[5]  
Fair Value 4,288,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,846 Federal National Mortgage Association Pool 5.00% 2040-11 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 3,846,000 [2],[3],[4],[5]  
Investment Owned Description Federal National Mortgage Association Pool [2],[3],[4],[5]  
Rate 5.00% [2],[3],[4],[5]  
Maturity 2040-11 [2],[3],[4],[5]  
Fair Value 4,208,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,852 Federal National Mortgage Association Pool 5.00% 2043-10 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 3,852,000 [2],[3],[4],[5]  
Investment Owned Description Federal National Mortgage Association Pool [2],[3],[4],[5]  
Rate 5.00% [2],[3],[4],[5]  
Maturity 2043-10 [2],[3],[4],[5]  
Fair Value 4,204,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,797 Federal National Mortgage Association Pool 5.00% 2044-01 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 3,797,000 [2],[3],[4],[5]  
Investment Owned Description Federal National Mortgage Association Pool [2],[3],[4],[5]  
Rate 5.00% [2],[3],[4],[5]  
Maturity 2044-01 [2],[3],[4],[5]  
Fair Value 4,180,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,202 Federal Home Loan Mortgage Corporation Pool 3.50% 2043-06 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 4,202,000 [2],[3],[4],[5]  
Investment Owned Description Federal Home Loan Mortgage Corporation Pool [2],[3],[4],[5]  
Rate 3.50% [2],[3],[4],[5]  
Maturity 2043-06 [2],[3],[4],[5]  
Fair Value 4,174,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,782 Federal National Mortgage Association Pool 5.00% 2043-10 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 3,782,000 [2],[3],[4],[5]  
Investment Owned Description Federal National Mortgage Association Pool [2],[3],[4],[5]  
Rate 5.00% [2],[3],[4],[5]  
Maturity 2043-10 [2],[3],[4],[5]  
Fair Value 4,131,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,790 Government National Mortgage Association 4.80% 2061-02 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 3,790,000 [2],[3],[4],[5]  
Investment Owned Description Government National Mortgage Association Pool [2],[3],[4],[5]  
Rate 4.80% [2],[3],[4],[5]  
Maturity 2061-02 [2],[3],[4],[5]  
Fair Value 4,118,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,900 Federal National Mortgage Association Pool 4.00% 2033-11 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 3,900,000 [2],[3],[4],[5]  
Investment Owned Description Federal National Mortgage Association Pool [2],[3],[4],[5]  
Rate 4.00% [2],[3],[4],[5]  
Maturity 2033-11 [2],[3],[4],[5]  
Fair Value 4,112,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,913 Federal Home Loan Mortgage Corporation Pool 4.00% 2043-10 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 3,913,000 [2],[3],[4],[5]  
Investment Owned Description Federal Home Loan Mortgage Corporation Pool [2],[3],[4],[5]  
Rate 4.00% [2],[3],[4],[5]  
Maturity 2043-10 [2],[3],[4],[5]  
Fair Value 4,067,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,709 Federal National Mortgage Association Pool 4.50% 2043-09 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 3,709,000 [2],[3],[4],[5]  
Investment Owned Description Federal National Mortgage Association Pool [2],[3],[4],[5]  
Rate 4.50% [2],[3],[4],[5]  
Maturity 2043-09 [2],[3],[4],[5]  
Fair Value 3,981,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,784 Federal Home Loan Mortgage Corporation Pool 4.00% 2043-11 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 3,784,000 [2],[3],[4],[5]  
Investment Owned Description Federal Home Loan Mortgage Corporation Pool [2],[3],[4],[5]  
Rate 4.00% [2],[3],[4],[5]  
Maturity 2043-11 [2],[3],[4],[5]  
Fair Value 3,924,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,583 Federal National Mortgage Association Pool 4.50% 2043-12 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 3,583,000 [2],[3],[4],[5]  
Investment Owned Description Federal National Mortgage Association Pool [2],[3],[4],[5]  
Rate 4.50% [2],[3],[4],[5]  
Maturity 2043-12 [2],[3],[4],[5]  
Fair Value 3,856,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,442 Government National Mortgage Association Pool 4.66% 2063-01 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 3,442,000 [2],[3],[4],[5]  
Investment Owned Description Government National Mortgage Association Pool [2],[3],[4],[5]  
Rate 4.66% [2],[3],[4],[5]  
Maturity 2063-01 [2],[3],[4],[5]  
Fair Value 3,802,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,630 Federal Home Loan Mortgage Corporation Pool 3.00% 2028-03 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 3,630,000 [2],[3],[4],[5]  
Investment Owned Description Federal Home Loan Mortgage Corporation Pool [2],[3],[4],[5]  
Rate 3.00% [2],[3],[4],[5]  
Maturity 2028-03 [2],[3],[4],[5]  
Fair Value 3,730,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,579 Federal National Mortgage Association Pool 4.00% 2043-08 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 3,579,000 [2],[3],[4],[5]  
Investment Owned Description Federal National Mortgage Association Pool [2],[3],[4],[5]  
Rate 4.00% [2],[3],[4],[5]  
Maturity 2043-08 [2],[3],[4],[5]  
Fair Value 3,726,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,481 Federal National Mortgage Association Pool 4.00% 2043-08 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 3,481,000 [2],[3],[4],[5]  
Investment Owned Description Federal National Mortgage Association Pool [2],[3],[4],[5]  
Rate 4.00% [2],[3],[4],[5]  
Maturity 2043-08 [2],[3],[4],[5]  
Fair Value 3,624,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,387 Federal National Mortgage Association Pool 4.50% 2043-10 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 3,387,000 [2],[3],[4],[5]  
Investment Owned Description Federal National Mortgage Association Pool [2],[3],[4],[5]  
Rate 4.50% [2],[3],[4],[5]  
Maturity 2043-10 [2],[3],[4],[5]  
Fair Value 3,618,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,297 Government National Mortgage Association Pool 4.67% 2061-10 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 3,297,000 [2],[3],[4],[5]  
Investment Owned Description Government National Mortgage Association Pool [2],[3],[4],[5]  
Rate 4.67% [2],[3],[4],[5]  
Maturity 2061-10 [2],[3],[4],[5]  
Fair Value 3,605,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,262 Federal National Mortgage Association Pool 4.5% 2043-10 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 3,262,000 [2],[3],[4],[5]  
Investment Owned Description Federal National Mortgage Association Pool [2],[3],[4],[5]  
Rate 4.50% [2],[3],[4],[5]  
Maturity 2043-10 [2],[3],[4],[5]  
Fair Value 3,487,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,495 Federal Home Loan Mortgage Corporation Pool 3.50% 2043-06 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 3,495,000 [2],[3],[4],[5]  
Investment Owned Description Federal Home Loan Mortgage Corporation Pool [2],[3],[4],[5]  
Rate 3.50% [2],[3],[4],[5]  
Maturity 2043-06 [2],[3],[4],[5]  
Fair Value 3,483,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,398 Federal National Mortgage Association Pool 3.50% 2043-01 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 3,398,000 [2],[3],[4],[5]  
Investment Owned Description Federal National Mortgage Association Pool [2],[3],[4],[5]  
Rate 3.50% [2],[3],[4],[5]  
Maturity 2043-01 [2],[3],[4],[5]  
Fair Value 3,430,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,089 Federal National Mortgage Association Pool 5.00% 2035-10 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 3,089,000 [2],[3],[4],[5]  
Investment Owned Description Federal National Mortgage Association Pool [2],[3],[4],[5]  
Rate 5.00% [2],[3],[4],[5]  
Maturity 2035-10 [2],[3],[4],[5]  
Fair Value 3,420,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,399 Federal National Mortgage Association Pool 3.50% 2042-06 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 3,399,000 [2],[3],[4],[5]  
Investment Owned Description Federal National Mortgage Association Pool [2],[3],[4],[5]  
Rate 3.50% [2],[3],[4],[5]  
Maturity 2042-06 [2],[3],[4],[5]  
Fair Value 3,390,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,323 Federal Home Loan Mortgage Corporation Pool 3.00% 2028-06 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 3,323,000 [2],[3],[4],[5]  
Investment Owned Description Federal Home Loan Mortgage Corporation Pool [2],[3],[4],[5]  
Rate 3.00% [2],[3],[4],[5]  
Maturity 2028-06 [2],[3],[4],[5]  
Fair Value 3,381,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,081 Government National Mortgage Association Pool 4.68% 2061-10 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 3,081,000 [2],[3],[4],[5]  
Investment Owned Description Government National Mortgage Association Pool [2],[3],[4],[5]  
Rate 4.68% [2],[3],[4],[5]  
Maturity 2061-10 [2],[3],[4],[5]  
Fair Value 3,366,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,041 Government National Mortgage Association Pool 5.54% 2060-02 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 3,041,000 [2],[3],[4],[5]  
Investment Owned Description Government National Mortgage Association Pool [2],[3],[4],[5]  
Rate 5.54% [2],[3],[4],[5]  
Maturity 2060-02 [2],[3],[4],[5]  
Fair Value 3,352,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,048 Federal National Mortgage Association Pool 5.00 2040-12 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 3,048,000 [2],[3],[4],[5]  
Investment Owned Description Federal National Mortgage Association Pool [2],[3],[4],[5]  
Rate 5.00% [2],[3],[4],[5]  
Maturity 2040-12 [2],[3],[4],[5]  
Fair Value 3,324,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,152 Federal National Mortgage Association Pool 4.00% 2033-12 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 3,152,000 [2],[3],[4],[5]  
Investment Owned Description Federal National Mortgage Association Pool [2],[3],[4],[5]  
Rate 4.00% [2],[3],[4],[5]  
Maturity 2033-12 [2],[3],[4],[5]  
Fair Value 3,321,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,180 Federal Home Loan Mortgage Corporation Pool 4.00% 2043-08 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 3,180,000 [2],[3],[4],[5]  
Investment Owned Description Federal Home Loan Mortgage Corporation Pool [2],[3],[4],[5]  
Rate 4.00% [2],[3],[4],[5]  
Maturity 2043-08 [2],[3],[4],[5]  
Fair Value 3,316,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,117 Federal National Mortgage Association Pool 4.00% 2026-06 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 3,117,000 [2],[3],[4],[5]  
Investment Owned Description Federal National Mortgage Association Pool [2],[3],[4],[5]  
Rate 4.00% [2],[3],[4],[5]  
Maturity 2026-06 [2],[3],[4],[5]  
Fair Value 3,303,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,113 Federal National Mortgage Association Pool 3.50% 2028-11 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 3,113,000 [2],[3],[4],[5]  
Investment Owned Description Federal National Mortgage Association Pool [2],[3],[4],[5]  
Rate 3.50% [2],[3],[4],[5]  
Maturity 2028-11 [2],[3],[4],[5]  
Fair Value 3,272,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 2,970 Federal National Mortgage Association Pool 5.00% 2043-11 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 2,970,000 [2],[3],[4],[5]  
Investment Owned Description Federal National Mortgage Association Pool [2],[3],[4],[5]  
Rate 5.00% [2],[3],[4],[5]  
Maturity 2043-11 [2],[3],[4],[5]  
Fair Value 3,270,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,128 Federal National Mortgage Association Pool 4.00% 2043-10 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 3,128,000 [2],[3],[4],[5]  
Investment Owned Description Federal National Mortgage Association Pool [2],[3],[4],[5]  
Rate 4.00% [2],[3],[4],[5]  
Maturity 2043-10 [2],[3],[4],[5]  
Fair Value 3,264,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,143 Federal National Mortgage Association Pool 3.00% 2028-06 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 3,143,000 [2],[3],[4],[5]  
Investment Owned Description Federal National Mortgage Association Pool [2],[3],[4],[5]  
Rate 3.00% [2],[3],[4],[5]  
Maturity 2028-06 [2],[3],[4],[5]  
Fair Value 3,233,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 2,986 Federal Home Loan Mortgage Corporation Pool 4.50% 2043-09 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 2,986,000 [2],[3],[4],[5]  
Investment Owned Description Federal Home Loan Mortgage Corporation Pool [2],[3],[4],[5]  
Rate 4.50% [2],[3],[4],[5]  
Maturity 2043-09 [2],[3],[4],[5]  
Fair Value 3,212,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 2,982 Federal National Mortgage Association Pool 4.50% 2042-04 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 2,982,000 [2],[3],[4],[5]  
Investment Owned Description Federal National Mortgage Association Pool [2],[3],[4],[5]  
Rate 4.50% [2],[3],[4],[5]  
Maturity 2042-04 [2],[3],[4],[5]  
Fair Value 3,185,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,079 Federal National Mortgage Association Pool 3.00% 2028-07 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 3,079,000 [2],[3],[4],[5]  
Investment Owned Description Federal National Mortgage Association Pool [2],[3],[4],[5]  
Rate 3.00% [2],[3],[4],[5]  
Maturity 2028-07 [2],[3],[4],[5]  
Fair Value 3,167,000 [2],[3],[4],[5]  
Principal And Interest - Fixed Rate Agency Securities [Member] | Other Federal National Mortgage Association Pools [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 129,803,000 [2],[3],[4],[5] 111,228,000 [2],[6],[7],[8]
Investment Owned Description Other Federal National Mortgage Association Pools [2],[3],[4],[5] Other Federal National Mortgage Association Pools [2],[6],[7],[8]
Fair Value 137,309,000 [2],[3],[4],[5] 115,792,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Other Federal National Mortgage Association Pools [Member] | Minimum [Member]
    
Schedule of Investments [Line Items]    
Rate 3.50% [2],[3],[4],[5] 3.00% [2],[6],[7],[8]
Maturity 2028-09 [2],[3],[4],[5] 2028-06 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Other Federal National Mortgage Association Pools [Member] | Maximum [Member]
    
Schedule of Investments [Line Items]    
Rate 6.00% [2],[3],[4],[5] 6.00% [2],[6],[7],[8]
Maturity 2044-03 [2],[3],[4],[5] 2044-01 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Other Federal Home Loan Mortgage Corporation Pools [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 84,810,000 [2],[3],[4],[5] 80,675,000 [2],[6],[7],[8]
Investment Owned Description Other Federal Home Loan Mortgage Corporation Pools [2],[3],[4],[5] Other Federal Home Loan Mortgage Corporation Pools [2],[6],[7],[8]
Fair Value 88,188,000 [2],[3],[4],[5] 81,716,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Other Federal Home Loan Mortgage Corporation Pools [Member] | Minimum [Member]
    
Schedule of Investments [Line Items]    
Rate 3.00% [2],[3],[4],[5] 2.50% [2],[6],[7],[8]
Maturity 2028-09 [2],[3],[4],[5] 2028-09 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Other Federal Home Loan Mortgage Corporation Pools [Member] | Maximum [Member]
    
Schedule of Investments [Line Items]    
Rate 6.00% [2],[3],[4],[5] 6.00% [2],[6],[7],[8]
Maturity 2044-03 [2],[3],[4],[5] 2043-12 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Other Government National Mortgage Association Pools [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 8,216,000 [2],[3],[4],[5] 8,191,000 [2],[6],[7],[8]
Investment Owned Description Other Government National Mortgage Association Pools [2],[3],[4],[5] Other Government National Mortgage Association Pools [2],[6],[7],[8]
Fair Value 9,009,000 [2],[3],[4],[5] 8,949,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Other Government National Mortgage Association Pools [Member] | Minimum [Member]
    
Schedule of Investments [Line Items]    
Rate 4.49% [2],[3],[4],[5] 4.49% [2],[6],[7],[8]
Maturity 2061-11 [2],[3],[4],[5] 2061-11 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Other Government National Mortgage Association Pools [Member] | Maximum [Member]
    
Schedule of Investments [Line Items]    
Rate 4.68% [2],[3],[4],[5] 4.68% [2],[6],[7],[8]
Maturity 2062-11 [2],[3],[4],[5] 2062-11 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 38,439 Federal National Mortgage Association Pool, 3.50% 2043-01 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   38,439,000 [2],[6],[7],[8]
Investment Owned Description   Federal National Mortgage Association Pool [2],[6],[7],[8]
Rate   3.50% [2],[6],[7],[8]
Maturity   2043-01 [2],[6],[7],[8]
Fair Value   37,742,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 27,523 Federal National Mortgage Association Pool, 3.50% 2042-10 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   27,523,000 [2],[6],[7],[8]
Investment Owned Description   Federal National Mortgage Association Pool [2],[6],[7],[8]
Rate   3.50% [2],[6],[7],[8]
Maturity   2042-10 [2],[6],[7],[8]
Fair Value   27,407,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 17,735 Federal National Mortgage Association Pool, 4.00% 2043-11 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   17,735,000 [2],[6],[7],[8]
Investment Owned Description   Federal National Mortgage Association Pool [2],[6],[7],[8]
Rate   4.00% [2],[6],[7],[8]
Maturity   2043-11 [2],[6],[7],[8]
Fair Value   18,327,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 18,267 Federal Home Loan Mortgage Corporation Pool, 3.00% 2043-04 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   18,267,000 [2],[6],[7],[8]
Investment Owned Description   Federal Home Loan Mortgage Corporation Pool [2],[6],[7],[8]
Rate   3.00% [2],[6],[7],[8]
Maturity   2043-04 [2],[6],[7],[8]
Fair Value   17,322,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 15,538 Federal National Mortgage Association Pool, 5.00% 2041-08 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   15,538,000 [2],[6],[7],[8]
Investment Owned Description   Federal National Mortgage Association Pool [2],[6],[7],[8]
Rate   5.00% [2],[6],[7],[8]
Maturity   2041-08 [2],[6],[7],[8]
Fair Value   16,910,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 16,572 Federal National Mortgage Association Pool, 3.00% 2028-06 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   16,572,000 [2],[6],[7],[8]
Investment Owned Description   Federal National Mortgage Association Pool [2],[6],[7],[8]
Rate   3.00% [2],[6],[7],[8]
Maturity   2028-06 [2],[6],[7],[8]
Fair Value   16,729,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 15,759 Federal National Mortgage Association Pool, 4.00% 2043-11 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   15,759,000 [2],[6],[7],[8]
Investment Owned Description   Federal National Mortgage Association Pool [2],[6],[7],[8]
Rate   4.00% [2],[6],[7],[8]
Maturity   2043-11 [2],[6],[7],[8]
Fair Value   16,279,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 15,017 Federal National Mortgage Association Pool, 4.50% 2041-10 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   15,017,000 [2],[6],[7],[8]
Investment Owned Description   Federal National Mortgage Association Pool [2],[6],[7],[8]
Rate   4.50% [2],[6],[7],[8]
Maturity   2041-10 [2],[6],[7],[8]
Fair Value   15,958,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 14,835 Federal National Mortgage Association Pool, 4.50% 2041-09 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   14,835,000 [2],[6],[7],[8]
Investment Owned Description   Federal National Mortgage Association Pool [2],[6],[7],[8]
Rate   4.50% [2],[6],[7],[8]
Maturity   2041-09 [2],[6],[7],[8]
Fair Value   15,743,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 13,367 Federal Home Loan Mortgage Corporation Pool, 4.00% 2043-08 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   13,367,000 [2],[6],[7],[8]
Investment Owned Description   Federal Home Loan Mortgage Corporation Pool [2],[6],[7],[8]
Rate   4.00% [2],[6],[7],[8]
Maturity   2043-08 [2],[6],[7],[8]
Fair Value   13,783,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 12,686 Federal Home Loan Mortgage Corporation Pool, 5.00% 2041-07 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   12,686,000 [2],[6],[7],[8]
Investment Owned Description   Federal Home Loan Mortgage Corporation Pool [2],[6],[7],[8]
Rate   5.00% [2],[6],[7],[8]
Maturity   2041-07 [2],[6],[7],[8]
Fair Value   13,692,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 12,316 Federal National Mortgage Association Pool, 5.00% 2041-03 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   12,316,000 [2],[6],[7],[8]
Investment Owned Description   Federal National Mortgage Association Pool [2],[6],[7],[8]
Rate   5.00% [2],[6],[7],[8]
Maturity   2041-03 [2],[6],[7],[8]
Fair Value   13,444,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 11,295 Federal National Mortgage Association Pool, 4.50% 2043-10 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   11,295,000 [2],[6],[7],[8]
Investment Owned Description   Federal National Mortgage Association Pool [2],[6],[7],[8]
Rate   4.50% [2],[6],[7],[8]
Maturity   2043-10 [2],[6],[7],[8]
Fair Value   12,005,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 11,478 Federal National Mortgage Association Pool, 4.00% 2043-10 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   11,478,000 [2],[6],[7],[8]
Investment Owned Description   Federal National Mortgage Association Pool [2],[6],[7],[8]
Rate   4.00% [2],[6],[7],[8]
Maturity   2043-10 [2],[6],[7],[8]
Fair Value   11,861,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 11,835 Federal National Mortgage Association Pool, 3.00% 2042-08 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   11,835,000 [2],[6],[7],[8]
Investment Owned Description   Federal National Mortgage Association Pool [2],[6],[7],[8]
Rate   3.00% [2],[6],[7],[8]
Maturity   2042-08 [2],[6],[7],[8]
Fair Value   11,263,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 9,697 Federal Home Loan Mortgage Corporation Pool, 4.00% 2043-07 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   9,697,000 [2],[6],[7],[8]
Investment Owned Description   Federal Home Loan Mortgage Corporation Pool [2],[6],[7],[8]
Rate   4.00% [2],[6],[7],[8]
Maturity   2043-07 [2],[6],[7],[8]
Fair Value   9,979,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 9,114 Federal National Mortgage Association Pool, 4.00% 2043-08 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   9,114,000 [2],[6],[7],[8]
Investment Owned Description   Federal National Mortgage Association Pool [2],[6],[7],[8]
Rate   4.00% [2],[6],[7],[8]
Maturity   2043-08 [2],[6],[7],[8]
Fair Value   9,409,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 8,841 Federal Home Loan Mortgage Corporation Pool, 4.50% 2041-10 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   8,841,000 [2],[6],[7],[8]
Investment Owned Description   Federal Home Loan Mortgage Corporation Pool [2],[6],[7],[8]
Rate   4.50% [2],[6],[7],[8]
Maturity   2041-10 [2],[6],[7],[8]
Fair Value   9,378,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 9,025 Federal National Mortgage Association Pool, 4.00% 2043-12 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   9,025,000 [2],[6],[7],[8]
Investment Owned Description   Federal National Mortgage Association Pool [2],[6],[7],[8]
Rate   4.00% [2],[6],[7],[8]
Maturity   2043-12 [2],[6],[7],[8]
Fair Value   9,326,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 9,747 Federal Home Loan Mortgage Corporation Pool, 3.00% 2043-02 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   9,747,000 [2],[6],[7],[8]
Investment Owned Description   Federal Home Loan Mortgage Corporation Pool [2],[6],[7],[8]
Rate   3.00% [2],[6],[7],[8]
Maturity   2043-02 [2],[6],[7],[8]
Fair Value   9,251,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 8,789 Federal National Mortgage Association Pool, 4.00% 2043-11 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   8,789,000 [2],[6],[7],[8]
Investment Owned Description   Federal National Mortgage Association Pool [2],[6],[7],[8]
Rate   4.00% [2],[6],[7],[8]
Maturity   2043-11 [2],[6],[7],[8]
Fair Value   9,013,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 7,413 Federal National Mortgage Association Pool, 4.50% 2026-04 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   7,413,000 [2],[6],[7],[8]
Investment Owned Description   Federal National Mortgage Association Pool [2],[6],[7],[8]
Rate   4.50% [2],[6],[7],[8]
Maturity   2026-04 [2],[6],[7],[8]
Fair Value   7,898,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 6,893 Federal National Mortgage Association Pool, 4.50% 2043-10 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   6,893,000 [2],[6],[7],[8]
Investment Owned Description   Federal National Mortgage Association Pool [2],[6],[7],[8]
Rate   4.50% [2],[6],[7],[8]
Maturity   2043-10 [2],[6],[7],[8]
Fair Value   7,326,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 7,327 Federal National Mortgage Association Pool, 3.50% 2042-11 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   7,327,000 [2],[6],[7],[8]
Investment Owned Description   Federal National Mortgage Association Pool [2],[6],[7],[8]
Rate   3.50% [2],[6],[7],[8]
Maturity   2042-11 [2],[6],[7],[8]
Fair Value   7,299,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 6,854 Federal Home Loan Mortgage Corporation Pool, 4.00% 2043-10 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   6,854,000 [2],[6],[7],[8]
Investment Owned Description   Federal Home Loan Mortgage Corporation Pool [2],[6],[7],[8]
Rate   4.00% [2],[6],[7],[8]
Maturity   2043-10 [2],[6],[7],[8]
Fair Value   7,005,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 6,288 Federal National Mortgage Association Pool, 5.50% 2039-10 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   6,288,000 [2],[6],[7],[8]
Investment Owned Description   Federal National Mortgage Association Pool [2],[6],[7],[8]
Rate   5.50% [2],[6],[7],[8]
Maturity   2039-10 [2],[6],[7],[8]
Fair Value   6,946,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 6,463 Federal National Mortgage Association Pool, 4.50% 2043-09 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   6,463,000 [2],[6],[7],[8]
Investment Owned Description   Federal National Mortgage Association Pool [2],[6],[7],[8]
Rate   4.50% [2],[6],[7],[8]
Maturity   2043-09 [2],[6],[7],[8]
Fair Value   6,865,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 6,033 Federal National Mortgage Association Pool, 4.50% 2043-12 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   6,033,000 [2],[6],[7],[8]
Investment Owned Description   Federal National Mortgage Association Pool [2],[6],[7],[8]
Rate   4.50% [2],[6],[7],[8]
Maturity   2043-12 [2],[6],[7],[8]
Fair Value   6,418,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 6,022 Federal National Mortgage Association Pool, 4.00% 2043-08 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   6,022,000 [2],[6],[7],[8]
Investment Owned Description   Federal National Mortgage Association Pool [2],[6],[7],[8]
Rate   4.00% [2],[6],[7],[8]
Maturity   2043-08 [2],[6],[7],[8]
Fair Value   6,228,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 6,025 Federal National Mortgage Association Pool, 4.00% 2043-10 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   6,025,000 [2],[6],[7],[8]
Investment Owned Description   Federal National Mortgage Association Pool [2],[6],[7],[8]
Rate   4.00% [2],[6],[7],[8]
Maturity   2043-10 [2],[6],[7],[8]
Fair Value   6,218,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 5,632 Government National Mortgage Association Pool, 4.46% 2063-02 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   5,632,000 [2],[6],[7],[8]
Investment Owned Description   Government National Mortgage Association Pool [2],[6],[7],[8]
Rate   4.46% [2],[6],[7],[8]
Maturity   2063-02 [2],[6],[7],[8]
Fair Value   6,136,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 5,893 Federal National Mortgage Association Pool, 4.00% 2043-08 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   5,893,000 [2],[6],[7],[8]
Investment Owned Description   Federal National Mortgage Association Pool [2],[6],[7],[8]
Rate   4.00% [2],[6],[7],[8]
Maturity   2043-08 [2],[6],[7],[8]
Fair Value   6,083,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 6,342 Federal National Mortgage Association Pool, 3.00% 2042-04 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   6,342,000 [2],[6],[7],[8]
Investment Owned Description   Federal National Mortgage Association Pool [2],[6],[7],[8]
Rate   3.00% [2],[6],[7],[8]
Maturity   2042-04 [2],[6],[7],[8]
Fair Value   6,035,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 6,287 Federal Home Loan Mortgage Corporation Pool, 3.00% 2043-01 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   6,287,000 [2],[6],[7],[8]
Investment Owned Description   Federal Home Loan Mortgage Corporation Pool [2],[6],[7],[8]
Rate   3.00% [2],[6],[7],[8]
Maturity   2043-01 [2],[6],[7],[8]
Fair Value   5,967,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 5,410 Federal National Mortgage Association Pool, 5.00% 2043-10 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   5,410,000 [2],[6],[7],[8]
Investment Owned Description   Federal National Mortgage Association Pool [2],[6],[7],[8]
Rate   5.00% [2],[6],[7],[8]
Maturity   2043-10 [2],[6],[7],[8]
Fair Value   5,925,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 5,702 Federal Home Loan Mortgage Corporation Pool, 4.00% 2043-08 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   5,702,000 [2],[6],[7],[8]
Investment Owned Description   Federal Home Loan Mortgage Corporation Pool [2],[6],[7],[8]
Rate   4.00% [2],[6],[7],[8]
Maturity   2043-08 [2],[6],[7],[8]
Fair Value   5,867,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 5,361 Government National Mortgage Association Pool, 4.54% 2062-11 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   5,361,000 [2],[6],[7],[8]
Investment Owned Description   Government National Mortgage Association Pool [2],[6],[7],[8]
Rate   4.54% [2],[6],[7],[8]
Maturity   2062-11 [2],[6],[7],[8]
Fair Value   5,859,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 5,241 Government National Mortgage Association Pool, 4.58% 2062-10 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   5,241,000 [2],[6],[7],[8]
Investment Owned Description   Government National Mortgage Association Pool [2],[6],[7],[8]
Rate   4.58% [2],[6],[7],[8]
Maturity   2062-10 [2],[6],[7],[8]
Fair Value   5,733,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 5,234 Government National Mortgage Association Pool, 4.63% 2061-06 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   5,234,000 [2],[6],[7],[8]
Investment Owned Description   Government National Mortgage Association Pool [2],[6],[7],[8]
Rate   4.63% [2],[6],[7],[8]
Maturity   2061-06 [2],[6],[7],[8]
Fair Value   5,688,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 5,978 Federal Home Loan Mortgage Corporation Pool, 3.00% 2043-04 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   5,978,000 [2],[6],[7],[8]
Investment Owned Description   Federal Home Loan Mortgage Corporation Pool [2],[6],[7],[8]
Rate   3.00% [2],[6],[7],[8]
Maturity   2043-04 [2],[6],[7],[8]
Fair Value   5,676,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 5,189 Government National Mortgage Association Pool, 4.60% 2062-06 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   5,189,000 [2],[6],[7],[8]
Investment Owned Description   Government National Mortgage Association Pool [2],[6],[7],[8]
Rate   4.60% [2],[6],[7],[8]
Maturity   2062-06 [2],[6],[7],[8]
Fair Value   5,672,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 5,338 Federal National Mortgage Association Pool, 4.50% 2043-11 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   5,338,000 [2],[6],[7],[8]
Investment Owned Description   Federal National Mortgage Association Pool [2],[6],[7],[8]
Rate   4.50% [2],[6],[7],[8]
Maturity   2043-11 [2],[6],[7],[8]
Fair Value   5,668,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 5,274 Federal National Mortgage Association Pool, 4.00% 2026-07 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   5,274,000 [2],[6],[7],[8]
Investment Owned Description   Federal National Mortgage Association Pool [2],[6],[7],[8]
Rate   4.00% [2],[6],[7],[8]
Maturity   2026-07 [2],[6],[7],[8]
Fair Value   5,593,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 5,147 Federal Home Loan Mortgage Corporation Pool, 4.50% 2043-10 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   5,147,000 [2],[6],[7],[8]
Investment Owned Description   Federal Home Loan Mortgage Corporation Pool [2],[6],[7],[8]
Rate   4.50% [2],[6],[7],[8]
Maturity   2043-10 [2],[6],[7],[8]
Fair Value   5,460,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 5,130 Federal Home Loan Mortgage Corporation Pool, 4.50% 2043-10 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   5,130,000 [2],[6],[7],[8]
Investment Owned Description   Federal Home Loan Mortgage Corporation Pool [2],[6],[7],[8]
Rate   4.50% [2],[6],[7],[8]
Maturity   2043-10 [2],[6],[7],[8]
Fair Value   5,442,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,904 Federal National Mortgage Association Pool, 4.00% 2043-01 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   4,904,000 [2],[6],[7],[8]
Investment Owned Description   Federal National Mortgage Association Pool [2],[6],[7],[8]
Rate   4.00% [2],[6],[7],[8]
Maturity   2043-01 [2],[6],[7],[8]
Fair Value   5,063,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,484 Federal National Mortgage Association Pool, 5.00% 2043-10 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   4,484,000 [2],[6],[7],[8]
Investment Owned Description   Federal National Mortgage Association Pool [2],[6],[7],[8]
Rate   5.00% [2],[6],[7],[8]
Maturity   2043-10 [2],[6],[7],[8]
Fair Value   4,897,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,720 Federal National Mortgage Association Pool, 4.00% 2042-04 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   4,720,000 [2],[6],[7],[8]
Investment Owned Description   Federal National Mortgage Association Pool [2],[6],[7],[8]
Rate   4.00% [2],[6],[7],[8]
Maturity   2042-04 [2],[6],[7],[8]
Fair Value   4,873,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 5,032 Federal Home Loan Mortgage Corporation Pool, 3.00% 2043-06 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   5,032,000 [2],[6],[7],[8]
Investment Owned Description   Federal Home Loan Mortgage Corporation Pool [2],[6],[7],[8]
Rate   3.00% [2],[6],[7],[8]
Maturity   2043-06 [2],[6],[7],[8]
Fair Value   4,776,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,472 Federal National Mortgage Association Pool, 4.50% 2043-10 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   4,472,000 [2],[6],[7],[8]
Investment Owned Description   Federal National Mortgage Association Pool [2],[6],[7],[8]
Rate   4.50% [2],[6],[7],[8]
Maturity   2043-10 [2],[6],[7],[8]
Fair Value   4,768,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,604 Federal National Mortgage Association Pool, 4.00% 2043-11 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   4,604,000 [2],[6],[7],[8]
Investment Owned Description   Federal National Mortgage Association Pool [2],[6],[7],[8]
Rate   4.00% [2],[6],[7],[8]
Maturity   2043-11 [2],[6],[7],[8]
Fair Value   4,758,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,477 Federal National Mortgage Association Pool, 4.50% 2043-08 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   4,477,000 [2],[6],[7],[8]
Investment Owned Description   Federal National Mortgage Association Pool [2],[6],[7],[8]
Rate   4.50% [2],[6],[7],[8]
Maturity   2043-08 [2],[6],[7],[8]
Fair Value   4,754,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,581 Federal Home Loan Mortgage Corporation Pool, 4.00% 2043-08 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   4,581,000 [2],[6],[7],[8]
Investment Owned Description   Federal Home Loan Mortgage Corporation Pool [2],[6],[7],[8]
Rate   4.00% [2],[6],[7],[8]
Maturity   2043-08 [2],[6],[7],[8]
Fair Value   4,715,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,359 Federal Home Loan Mortgage Corporation Pool, 4.50% 2043-09 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   4,359,000 [2],[6],[7],[8]
Investment Owned Description   Federal Home Loan Mortgage Corporation Pool [2],[6],[7],[8]
Rate   4.50% [2],[6],[7],[8]
Maturity   2043-09 [2],[6],[7],[8]
Fair Value   4,625,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,604 Federal National Mortgage Association Pool, 3.50% 2043-08 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   4,604,000 [2],[6],[7],[8]
Investment Owned Description   Federal National Mortgage Association Pool [2],[6],[7],[8]
Rate   3.50% [2],[6],[7],[8]
Maturity   2043-08 [2],[6],[7],[8]
Fair Value   4,586,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,673 Federal Home Loan Mortgage Corporation Pool, 3.00% 2043-02 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   4,673,000 [2],[6],[7],[8]
Investment Owned Description   Federal Home Loan Mortgage Corporation Pool [2],[6],[7],[8]
Rate   3.00% [2],[6],[7],[8]
Maturity   2043-02 [2],[6],[7],[8]
Fair Value   4,435,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,060 Federal National Mortgage Association Pool, 5.00% 2043-10 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   4,060,000 [2],[6],[7],[8]
Investment Owned Description   Federal National Mortgage Association Pool [2],[6],[7],[8]
Rate   5.00% [2],[6],[7],[8]
Maturity   2043-10 [2],[6],[7],[8]
Fair Value   4,423,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,025 Federal National Mortgage Association Pool, 5.00% 2043-10 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   4,025,000 [2],[6],[7],[8]
Investment Owned Description   Federal National Mortgage Association Pool [2],[6],[7],[8]
Rate   5.00% [2],[6],[7],[8]
Maturity   2043-10 [2],[6],[7],[8]
Fair Value   4,387,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,231 Federal National Mortgage Association Pool, 4.00% 2043-11 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   4,231,000 [2],[6],[7],[8]
Investment Owned Description   Federal National Mortgage Association Pool [2],[6],[7],[8]
Rate   4.00% [2],[6],[7],[8]
Maturity   2043-11 [2],[6],[7],[8]
Fair Value   4,372,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,932 Government National Mortgage Association Pool, 4.69% 2061-07 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   3,932,000 [2],[6],[7],[8]
Investment Owned Description   Government National Mortgage Association Pool [2],[6],[7],[8]
Rate   4.69% [2],[6],[7],[8]
Maturity   2061-07 [2],[6],[7],[8]
Fair Value   4,288,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,886 Government National Mortgage Association Pool, 4.75% 2061-01 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   3,886,000 [2],[6],[7],[8]
Investment Owned Description   Government National Mortgage Association Pool [2],[6],[7],[8]
Rate   4.75% [2],[6],[7],[8]
Maturity   2061-01 [2],[6],[7],[8]
Fair Value   4,213,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,864 Federal National Mortgage Association Pool, 5.00% 2040-11 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   3,864,000 [2],[6],[7],[8]
Investment Owned Description   Federal National Mortgage Association Pool [2],[6],[7],[8]
Rate   5.00% [2],[6],[7],[8]
Maturity   2040-11 [2],[6],[7],[8]
Fair Value   4,203,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,811 Federal National Mortgage Association Pool, 5.00% 2044-01 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   3,811,000 [2],[6],[7],[8]
Investment Owned Description   Federal National Mortgage Association Pool [2],[6],[7],[8]
Rate   5.00% [2],[6],[7],[8]
Maturity   2044-01 [2],[6],[7],[8]
Fair Value   4,169,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,826 Government National Mortgage Association Pool, 4.80% 2061-02 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   3,826,000 [2],[6],[7],[8]
Investment Owned Description   Government National Mortgage Association Pool [2],[6],[7],[8]
Rate   4.80% [2],[6],[7],[8]
Maturity   2061-02 [2],[6],[7],[8]
Fair Value   4,157,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,225 Federal Home Loan Mortgage Corporation Pool, 3.50% 2043-06 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   4,225,000 [2],[6],[7],[8]
Investment Owned Description   Federal Home Loan Mortgage Corporation Pool [2],[6],[7],[8]
Rate   3.50% [2],[6],[7],[8]
Maturity   2043-06 [2],[6],[7],[8]
Fair Value   4,137,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,929 Federal Home Loan Mortgage Corporation Pool, 4.00% 2043-10 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   3,929,000 [2],[6],[7],[8]
Investment Owned Description   Federal Home Loan Mortgage Corporation Pool [2],[6],[7],[8]
Rate   4.00% [2],[6],[7],[8]
Maturity   2043-10 [2],[6],[7],[8]
Fair Value   4,043,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,801 Federal Home Loan Mortgage Corporation Pool, 4.00% 2043-11 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   3,801,000 [2],[6],[7],[8]
Investment Owned Description   Federal Home Loan Mortgage Corporation Pool [2],[6],[7],[8]
Rate   4.00% [2],[6],[7],[8]
Maturity   2043-11 [2],[6],[7],[8]
Fair Value   3,885,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,599 Federal National Mortgage Association Pool, 4.50% 2043-12 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   3,599,000 [2],[6],[7],[8]
Investment Owned Description   Federal National Mortgage Association Pool [2],[6],[7],[8]
Rate   4.50% [2],[6],[7],[8]
Maturity   2043-12 [2],[6],[7],[8]
Fair Value   3,837,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,737 Federal Home Loan Mortgage Corporation Pool, 3.00% 2028-03 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   3,737,000 [2],[6],[7],[8]
Investment Owned Description   Federal Home Loan Mortgage Corporation Pool [2],[6],[7],[8]
Rate   3.00% [2],[6],[7],[8]
Maturity   2028-03 [2],[6],[7],[8]
Fair Value   3,810,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,434 Government National Mortgage Association Pool, 4.66% 2063-01 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   3,434,000 [2],[6],[7],[8]
Investment Owned Description   Government National Mortgage Association Pool [2],[6],[7],[8]
Rate   4.66% [2],[6],[7],[8]
Maturity   2063-01 [2],[6],[7],[8]
Fair Value   3,772,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,448 Federal National Mortgage Association Pool, 5.00% 2040-12 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   3,448,000 [2],[6],[7],[8]
Investment Owned Description   Federal National Mortgage Association Pool [2],[6],[7],[8]
Rate   5.00% [2],[6],[7],[8]
Maturity   2040-12 [2],[6],[7],[8]
Fair Value   3,759,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,601 Federal National Mortgage Association Pool, 4.00% 2043-08 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   3,601,000 [2],[6],[7],[8]
Investment Owned Description   Federal National Mortgage Association Pool [2],[6],[7],[8]
Rate   4.00% [2],[6],[7],[8]
Maturity   2043-08 [2],[6],[7],[8]
Fair Value   3,715,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,594 Federal National Mortgage Association Pool, 4.00% 2043-08 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   3,594,000 [2],[6],[7],[8]
Investment Owned Description   Federal National Mortgage Association Pool [2],[6],[7],[8]
Rate   4.00% [2],[6],[7],[8]
Maturity   2043-08 [2],[6],[7],[8]
Fair Value   3,710,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,566 Federal National Mortgage Association Pool, 4.00% 2043-08 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   3,566,000 [2],[6],[7],[8]
Investment Owned Description   Federal National Mortgage Association Pool [2],[6],[7],[8]
Rate   4.00% [2],[6],[7],[8]
Maturity   2043-08 [2],[6],[7],[8]
Fair Value   3,683,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,400 Federal National Mortgage Association Pool, 4.50% 2043-10 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   3,400,000 [2],[6],[7],[8]
Investment Owned Description   Federal National Mortgage Association Pool [2],[6],[7],[8]
Rate   4.50% [2],[6],[7],[8]
Maturity   2043-10 [2],[6],[7],[8]
Fair Value   3,613,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,495 Federal National Mortgage Association Pool, 4.00% 2043-08 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   3,495,000 [2],[6],[7],[8]
Investment Owned Description   Federal National Mortgage Association Pool [2],[6],[7],[8]
Rate   4.00% [2],[6],[7],[8]
Maturity   2043-08 [2],[6],[7],[8]
Fair Value   3,608,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,273 Federal National Mortgage Association Pool, 4.50% 2043-10 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   3,273,000 [2],[6],[7],[8]
Investment Owned Description   Federal National Mortgage Association Pool [2],[6],[7],[8]
Rate   4.50% [2],[6],[7],[8]
Maturity   2043-10 [2],[6],[7],[8]
Fair Value   3,479,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,515 Federal Home Loan Mortgage Corporation Pool, 3.50% 2043-06 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   3,515,000 [2],[6],[7],[8]
Investment Owned Description   Federal Home Loan Mortgage Corporation Pool [2],[6],[7],[8]
Rate   3.50% [2],[6],[7],[8]
Maturity   2043-06 [2],[6],[7],[8]
Fair Value   3,454,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,111 Federal National Mortgage Association Pool, 5.00% 2035-10 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   3,111,000 [2],[6],[7],[8]
Investment Owned Description   Federal National Mortgage Association Pool [2],[6],[7],[8]
Rate   5.00% [2],[6],[7],[8]
Maturity   2035-10 [2],[6],[7],[8]
Fair Value   3,429,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,134 Government National Mortgage Association Pool, 4.68% 2061-10 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   3,134,000 [2],[6],[7],[8]
Investment Owned Description   Government National Mortgage Association Pool [2],[6],[7],[8]
Rate   4.68% [2],[6],[7],[8]
Maturity   2061-10 [2],[6],[7],[8]
Fair Value   3,421,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,094 Government National Mortgage Association Pool, 5.54% 2060-02 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   3,094,000 [2],[6],[7],[8]
Investment Owned Description   Government National Mortgage Association Pool [2],[6],[7],[8]
Rate   5.54% [2],[6],[7],[8]
Maturity   2060-02 [2],[6],[7],[8]
Fair Value   3,420,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,469 Federal National Mortgage Association Pool, 3.50% 2042-06 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   3,469,000 [2],[6],[7],[8]
Investment Owned Description   Federal National Mortgage Association Pool [2],[6],[7],[8]
Rate   3.50% [2],[6],[7],[8]
Maturity   2042-06 [2],[6],[7],[8]
Fair Value   3,419,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,387 Federal Home Loan Mortgage Corporation Pool, 3.00% 2028-06 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   3,387,000 [2],[6],[7],[8]
Investment Owned Description   Federal Home Loan Mortgage Corporation Pool [2],[6],[7],[8]
Rate   3.00% [2],[6],[7],[8]
Maturity   2028-06 [2],[6],[7],[8]
Fair Value   3,412,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,421 Federal National Mortgage Association Pool, 3.50% 2043-01 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   3,421,000 [2],[6],[7],[8]
Investment Owned Description   Federal National Mortgage Association Pool [2],[6],[7],[8]
Rate   3.50% [2],[6],[7],[8]
Maturity   2043-01 [2],[6],[7],[8]
Fair Value   3,407,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,170 Federal National Mortgage Association Pool, 4.00% 2026-06 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   3,170,000 [2],[6],[7],[8]
Investment Owned Description   Federal National Mortgage Association Pool [2],[6],[7],[8]
Rate   4.00% [2],[6],[7],[8]
Maturity   2026-06 [2],[6],[7],[8]
Fair Value   3,362,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,200 Federal National Mortgage Association Pool, 3.50% 2028-11 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   3,200,000 [2],[6],[7],[8]
Investment Owned Description   Federal National Mortgage Association Pool [2],[6],[7],[8]
Rate   3.50% [2],[6],[7],[8]
Maturity   2028-11 [2],[6],[7],[8]
Fair Value   3,355,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,194 Federal Home Loan Mortgage Corporation Pool, 4.00% 2043-08 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   3,194,000 [2],[6],[7],[8]
Investment Owned Description   Federal Home Loan Mortgage Corporation Pool [2],[6],[7],[8]
Rate   4.00% [2],[6],[7],[8]
Maturity   2043-08 [2],[6],[7],[8]
Fair Value   3,294,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,203 Federal National Mortgage Association Pool, 3.00% 2028-06 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   3,203,000 [2],[6],[7],[8]
Investment Owned Description   Federal National Mortgage Association Pool [2],[6],[7],[8]
Rate   3.00% [2],[6],[7],[8]
Maturity   2028-06 [2],[6],[7],[8]
Fair Value   3,274,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 2,981 Federal National Mortgage Association Pool, 5.00% 2043-11 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   2,981,000 [2],[6],[7],[8]
Investment Owned Description   Federal National Mortgage Association Pool [2],[6],[7],[8]
Rate   5.00% [2],[6],[7],[8]
Maturity   2043-11 [2],[6],[7],[8]
Fair Value   3,261,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,218 Federal National Mortgage Association Pool, 3.00% 2028-03 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   3,218,000 [2],[6],[7],[8]
Investment Owned Description   Federal National Mortgage Association Pool [2],[6],[7],[8]
Rate   3.00% [2],[6],[7],[8]
Maturity   2028-03 [2],[6],[7],[8]
Fair Value   3,249,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,142 Federal National Mortgage Association Pool, 4.00% 2043-10 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   3,142,000 [2],[6],[7],[8]
Investment Owned Description   Federal National Mortgage Association Pool [2],[6],[7],[8]
Rate   4.00% [2],[6],[7],[8]
Maturity   2043-10 [2],[6],[7],[8]
Fair Value   3,247,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,124 Federal National Mortgage Association Pool, 3.00% 2028-07 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   3,124,000 [2],[6],[7],[8]
Investment Owned Description   Federal National Mortgage Association Pool [2],[6],[7],[8]
Rate   3.00% [2],[6],[7],[8]
Maturity   2028-07 [2],[6],[7],[8]
Fair Value   3,193,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 2,998 Federal Home Loan Mortgage Corporation Pool, 4.50% 2043-09 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   2,998,000 [2],[6],[7],[8]
Investment Owned Description   Federal Home Loan Mortgage Corporation Pool [2],[6],[7],[8]
Rate   4.50% [2],[6],[7],[8]
Maturity   2043-09 [2],[6],[7],[8]
Fair Value   3,191,000 [2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 2,996 Federal National Mortgage Association Pool, 4.50% 2042-04 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   2,996,000 [2],[6],[7],[8]
Investment Owned Description   Federal National Mortgage Association Pool [2],[6],[7],[8]
Rate   4.50% [2],[6],[7],[8]
Maturity   2042-04 [2],[6],[7],[8]
Fair Value   3,182,000 [2],[6],[7],[8]
Interest Only - Fixed Rate Agency Securities [Member]
    
Schedule of Investments [Line Items]    
Investment owned as a percentage of equity 3.07% [1],[2],[3],[4],[5] 3.06% [1],[2],[6],[7],[8]
Fair Value 19,342,000 [2],[3],[4],[5] 19,132,000 [2],[6],[7],[8]
Interest Only - Fixed Rate Agency Securities [Member] | Other Federal National Mortgage Association [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 90,597,000 [2],[3],[4],[5] 97,796,000 [2],[6],[7],[8]
Investment Owned Description Other Federal National Mortgage Association [2],[3],[4],[5] Other Federal National Mortgage Association [2],[6],[7],[8]
Fair Value 12,689,000 [2],[3],[4],[5] 13,821,000 [2],[6],[7],[8]
Interest Only - Fixed Rate Agency Securities [Member] | Other Federal National Mortgage Association [Member] | Minimum [Member]
    
Schedule of Investments [Line Items]    
Rate 3.00% [2],[3],[4],[5] 3.00% [2],[6],[7],[8]
Maturity 2020-12 [2],[3],[4],[5] 2020-12 [2],[6],[7],[8]
Interest Only - Fixed Rate Agency Securities [Member] | Other Federal National Mortgage Association [Member] | Maximum [Member]
    
Schedule of Investments [Line Items]    
Rate 5.50% [2],[3],[4],[5] 5.50% [2],[6],[7],[8]
Maturity 2043-06 [2],[3],[4],[5] 2043-06 [2],[6],[7],[8]
Interest Only - Fixed Rate Agency Securities [Member] | Other Federal Home Loan Mortgage Corporation [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 31,248,000 [2],[3],[4],[5] 21,959,000 [2],[6],[7],[8]
Investment Owned Description Other Federal Home Loan Mortgage Corporation [2],[3],[4],[5] Other Federal Home Loan Mortgage Corporation [2],[6],[7],[8]
Fair Value 4,987,000 [2],[3],[4],[5] 3,577,000 [2],[6],[7],[8]
Interest Only - Fixed Rate Agency Securities [Member] | Other Federal Home Loan Mortgage Corporation [Member] | Minimum [Member]
    
Schedule of Investments [Line Items]    
Rate 3.00% [2],[3],[4],[5] 3.00% [2],[6],[7],[8]
Maturity 2032-12 [2],[3],[4],[5] 2032-12 [2],[6],[7],[8]
Interest Only - Fixed Rate Agency Securities [Member] | Other Federal Home Loan Mortgage Corporation [Member] | Maximum [Member]
    
Schedule of Investments [Line Items]    
Rate 5.50% [2],[3],[4],[5] 5.50% [2],[6],[7],[8]
Maturity 2043-01 [2],[3],[4],[5] 2043-01 [2],[6],[7],[8]
Interest Only - Fixed Rate Agency Securities [Member] | Other Government National Mortgage Association [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 9,938,000 [2],[3],[4],[5] 10,460,000 [2],[6],[7],[8]
Investment Owned Description Other Government National Mortgage Association [2],[3],[4],[5] Other Government National Mortgage Association [2],[6],[7],[8]
Fair Value 1,666,000 [2],[3],[4],[5] 1,734,000 [2],[6],[7],[8]
Interest Only - Fixed Rate Agency Securities [Member] | Other Government National Mortgage Association [Member] | Minimum [Member]
    
Schedule of Investments [Line Items]    
Rate 3.00% [2],[3],[4],[5] 3.00% [2],[6],[7],[8]
Maturity 2040-07 [2],[3],[4],[5] 2036-03 [2],[6],[7],[8]
Interest Only - Fixed Rate Agency Securities [Member] | Other Government National Mortgage Association [Member] | Maximum [Member]
    
Schedule of Investments [Line Items]    
Rate 4.75% [2],[3],[4],[5] 5.50% [2],[6],[7],[8]
Maturity 2042-11 [2],[3],[4],[5] 2042-11 [2],[6],[7],[8]
TBA - Fixed Rate Agency Securities [Member]
    
Schedule of Investments [Line Items]    
Investment owned as a percentage of equity 30.23% [1],[2],[3],[4],[5] 15.47% [1],[2],[6],[7],[8]
Fair Value 190,446,000 [2],[3],[4],[5] 96,856,000 [2],[6],[7],[8]
TBA - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association (30 Year) [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 164,050,000 [2],[3],[4],[5]  
Investment Owned Description Federal National Mortgage Association (30 Year) [2],[3],[4],[5]  
Rate 3.00% [2],[3],[4],[5]  
Maturity 2014-04 [2],[3],[4],[5]  
Fair Value 158,379,000 [2],[3],[4],[5]  
TBA - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation (30 Year) [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 33,270,000 [2],[3],[4],[5]  
Investment Owned Description Federal Home Loan Mortgage Corporation (30 Year) [2],[3],[4],[5]  
Rate 3.00% [2],[3],[4],[5]  
Maturity 2014-04 [2],[3],[4],[5]  
Fair Value 32,067,000 [2],[3],[4],[5]  
TBA - Fixed Rate Agency Securities [Member] | 63,300 Federal Home Loan Mortgage Corporation (30 Year) 3.00% 2014-01 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   63,300,000 [2],[6],[7],[8]
Investment Owned Description   Federal Home Loan Mortgage Corporation (30 Year) [2],[6],[7],[8]
Rate   3.00% [2],[6],[7],[8]
Maturity   2014-01 [2],[6],[7],[8]
Fair Value   60,016,000 [2],[6],[7],[8]
TBA - Fixed Rate Agency Securities [Member] | 31,150 Federal National Mortgage Association (30 Year) 3.00% 2014-01 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   31,150,000 [2],[6],[7],[8]
Investment Owned Description   Federal National Mortgage Association (30 Year) [2],[6],[7],[8]
Rate   3.00% [2],[6],[7],[8]
Maturity   2014-01 [2],[6],[7],[8]
Fair Value   29,612,000 [2],[6],[7],[8]
TBA - Fixed Rate Agency Securities [Member] | 6,700 Federal Home Loan Mortgage Corporation (30 Year) 5.00% 2014-01 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   6,700,000 [2],[6],[7],[8]
Investment Owned Description   Federal Home Loan Mortgage Corporation (30 Year) [2],[6],[7],[8]
Rate   5.00% [2],[6],[7],[8]
Maturity   2014-01 [2],[6],[7],[8]
Fair Value   7,228,000 [2],[6],[7],[8]
Fixed Rate Agency Securities [Member]
    
Schedule of Investments [Line Items]    
Investment owned as a percentage of equity 168.88% [1],[2],[3],[4],[5] 156.28% [1],[2],[6],[7],[8]
Fair Value 1,064,051,000 [2],[3],[4],[5] 978,356,000 [2],[6],[7],[8]
Investment Owned, at Cost 1,065,670,000 [2],[3],[4],[5] 992,207,000 [2],[6],[7],[8]
Principal And Interest - Floating Rate Agency Securities [Member]
    
Schedule of Investments [Line Items]    
Investment owned as a percentage of equity 5.09% [1],[2],[3],[4],[5] 4.89% [1],[2],[6],[7],[8]
Fair Value 32,073,000 [2],[3],[4],[5] 30,618,000 [2],[6],[7],[8]
Principal And Interest - Floating Rate Agency Securities [Member] | Other Federal National Mortgage Association Pools [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 6,066,000 [2],[3],[4],[5] 3,667,000 [2],[6],[7],[8]
Investment Owned Description Other Federal National Mortgage Association Pools [2],[3],[4],[5] Other Federal National Mortgage Association Pools [2],[6],[7],[8]
Fair Value 6,456,000 [2],[3],[4],[5] 3,900,000 [2],[6],[7],[8]
Principal And Interest - Floating Rate Agency Securities [Member] | Other Federal National Mortgage Association Pools [Member] | Minimum [Member]
    
Schedule of Investments [Line Items]    
Rate 2.64% [2],[3],[4],[5] 2.64% [2],[6],[7],[8]
Maturity 2035-09 [2],[3],[4],[5] 2036-04 [2],[6],[7],[8]
Principal And Interest - Floating Rate Agency Securities [Member] | Other Federal National Mortgage Association Pools [Member] | Maximum [Member]
    
Schedule of Investments [Line Items]    
Rate 6.05% [2],[3],[4],[5] 6.05% [2],[6],[7],[8]
Maturity 2037-09 [2],[3],[4],[5] 2037-09 [2],[6],[7],[8]
Principal And Interest - Floating Rate Agency Securities [Member] | Other Federal Home Loan Mortgage Corporation Pools [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 2,931,000 [2],[3],[4],[5] 3,148,000 [2],[6],[7],[8]
Investment Owned Description Other Federal Home Loan Mortgage Corporation Pools [2],[3],[4],[5] Other Federal Home Loan Mortgage Corporation Pools [2],[6],[7],[8]
Fair Value 3,132,000 [2],[3],[4],[5] 3,341,000 [2],[6],[7],[8]
Principal And Interest - Floating Rate Agency Securities [Member] | Other Federal Home Loan Mortgage Corporation Pools [Member] | Minimum [Member]
    
Schedule of Investments [Line Items]    
Rate 5.83% [2],[3],[4],[5] 5.83% [2],[6],[7],[8]
Maturity 2037-06 [2],[3],[4],[5] 2037-06 [2],[6],[7],[8]
Principal And Interest - Floating Rate Agency Securities [Member] | Other Federal Home Loan Mortgage Corporation Pools [Member] | Maximum [Member]
    
Schedule of Investments [Line Items]    
Rate 5.90% [2],[3],[4],[5] 5.89% [2],[6],[7],[8]
Maturity 2037-07 [2],[3],[4],[5] 2037-07 [2],[6],[7],[8]
Principal And Interest - Floating Rate Agency Securities [Member] | 5,872 Federal National Mortgage Association Pool 4.94% 2038-04 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 5,872,000 [2],[3],[4],[5]  
Investment Owned Description Federal National Mortgage Association Pool [2],[3],[4],[5]  
Rate 4.94% [2],[3],[4],[5]  
Maturity 2038-04 [2],[3],[4],[5]  
Fair Value 6,265,000 [2],[3],[4],[5]  
Principal And Interest - Floating Rate Agency Securities [Member] | 4,730 Federal National Mortgage Association Pool 4.26% 2040-04 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 4,730,000 [2],[3],[4],[5]  
Investment Owned Description Federal National Mortgage Association Pool [2],[3],[4],[5]  
Rate 4.26% [2],[3],[4],[5]  
Maturity 2040-04 [2],[3],[4],[5]  
Fair Value 5,043,000 [2],[3],[4],[5]  
Principal And Interest - Floating Rate Agency Securities [Member] | 3,672 Federal National Mortgage Association Pool 5.73% 2037-07 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 3,672,000 [2],[3],[4],[5]  
Investment Owned Description Federal National Mortgage Association Pool [2],[3],[4],[5]  
Rate 5.73% [2],[3],[4],[5]  
Maturity 2037-07 [2],[3],[4],[5]  
Fair Value 3,911,000 [2],[3],[4],[5]  
Principal And Interest - Floating Rate Agency Securities [Member] | 3,643 Federal National Mortgage Association Pool 2.53% 2038-05 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 3,643,000 [2],[3],[4],[5]  
Investment Owned Description Federal National Mortgage Association Pool [2],[3],[4],[5]  
Rate 2.53% [2],[3],[4],[5]  
Maturity 2038-05 [2],[3],[4],[5]  
Fair Value 3,875,000 [2],[3],[4],[5]  
Principal And Interest - Floating Rate Agency Securities [Member] | 3,228 Federal National Mortgage Association Pool 6.15% 2037-08 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 3,228,000 [2],[3],[4],[5]  
Investment Owned Description Federal National Mortgage Association Pool [2],[3],[4],[5]  
Rate 6.15% [2],[3],[4],[5]  
Maturity 2037-08 [2],[3],[4],[5]  
Fair Value 3,391,000 [2],[3],[4],[5]  
Principal And Interest - Floating Rate Agency Securities [Member] | 6,281 Federal Home Loan Mortgage Corporation Pool, 4.92% 2038-04 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   6,281,000 [2],[6],[7],[8]
Investment Owned Description   Federal Home Loan Mortgage Corporation Pool [2],[6],[7],[8]
Rate   4.92% [2],[6],[7],[8]
Maturity   2038-04 [2],[6],[7],[8]
Fair Value   6,709,000 [2],[6],[7],[8]
Principal And Interest - Floating Rate Agency Securities [Member] | 4,935 Federal National Mortgage Association Pool, 4.27% 2040-04 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   4,935,000 [2],[6],[7],[8]
Investment Owned Description   Federal National Mortgage Association Pool [2],[6],[7],[8]
Rate   4.27% [2],[6],[7],[8]
Maturity   2040-04 [2],[6],[7],[8]
Fair Value   5,256,000 [2],[6],[7],[8]
Principal And Interest - Floating Rate Agency Securities [Member] | 3,674 Federal National Mortgage Association Pool, 5.73% 2037-07 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   3,674,000 [2],[6],[7],[8]
Investment Owned Description   Federal National Mortgage Association Pool [2],[6],[7],[8]
Rate   5.73% [2],[6],[7],[8]
Maturity   2037-07 [2],[6],[7],[8]
Fair Value   3,937,000 [2],[6],[7],[8]
Principal And Interest - Floating Rate Agency Securities [Member] | 3,646 Federal National Mortgage Association Pool, 2.53% 2038-05 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   3,646,000 [2],[6],[7],[8]
Investment Owned Description   Federal National Mortgage Association Pool [2],[6],[7],[8]
Rate   2.53% [2],[6],[7],[8]
Maturity   2038-05 [2],[6],[7],[8]
Fair Value   3,878,000 [2],[6],[7],[8]
Principal And Interest - Floating Rate Agency Securities [Member] | 3,395 Federal National Mortgage Association Pool, 6.1% 2037-08 [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount   3,395,000 [2],[6],[7],[8]
Investment Owned Description   Federal National Mortgage Association Pool [2],[6],[7],[8]
Rate   6.10% [2],[6],[7],[8]
Maturity   2037-08 [2],[6],[7],[8]
Fair Value   3,597,000 [2],[6],[7],[8]
Interest Only - Floating Rate Agency Securities [Member]
    
Schedule of Investments [Line Items]    
Investment owned as a percentage of equity 3.50% [1],[2],[3],[4],[5] 3.41% [1],[2],[6],[7],[8]
Fair Value 22,033,000 [2],[3],[4],[5] 21,372,000 [2],[6],[7],[8]
Interest Only - Floating Rate Agency Securities [Member] | Other Federal National Mortgage Association [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 24,446,000 [2],[3],[4],[5] 25,322,000 [2],[6],[7],[8]
Investment Owned Description Other Federal National Mortgage Association [2],[3],[4],[5] Other Federal National Mortgage Association [2],[6],[7],[8]
Fair Value 4,483,000 [2],[3],[4],[5] 4,600,000 [2],[6],[7],[8]
Interest Only - Floating Rate Agency Securities [Member] | Other Federal National Mortgage Association [Member] | Minimum [Member]
    
Schedule of Investments [Line Items]    
Rate 5.50% [2],[3],[4],[5] 5.50% [2],[6],[7],[8]
Maturity 2036-08 [2],[3],[4],[5] 2036-08 [2],[6],[7],[8]
Interest Only - Floating Rate Agency Securities [Member] | Other Federal National Mortgage Association [Member] | Maximum [Member]
    
Schedule of Investments [Line Items]    
Rate 6.60% [2],[3],[4],[5] 6.59% [2],[6],[7],[8]
Maturity 2043-07 [2],[3],[4],[5] 2043-07 [2],[6],[7],[8]
Interest Only - Floating Rate Agency Securities [Member] | Other Federal Home Loan Mortgage Corporation [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 17,165,000 [2],[3],[4],[5] 18,180,000 [2],[6],[7],[8]
Investment Owned Description Other Federal Home Loan Mortgage Corporation [2],[3],[4],[5] Other Federal Home Loan Mortgage Corporation [2],[6],[7],[8]
Fair Value 2,237,000 [2],[3],[4],[5] 2,433,000 [2],[6],[7],[8]
Interest Only - Floating Rate Agency Securities [Member] | Other Federal Home Loan Mortgage Corporation [Member] | Minimum [Member]
    
Schedule of Investments [Line Items]    
Rate 5.85% [2],[3],[4],[5] 5.83% [2],[6],[7],[8]
Maturity 2038-11 [2],[3],[4],[5] 2038-11 [2],[6],[7],[8]
Interest Only - Floating Rate Agency Securities [Member] | Other Federal Home Loan Mortgage Corporation [Member] | Maximum [Member]
    
Schedule of Investments [Line Items]    
Rate 6.55% [2],[3],[4],[5] 6.53% [2],[6],[7],[8]
Maturity 2039-08 [2],[3],[4],[5] 2039-08 [2],[6],[7],[8]
Interest Only - Floating Rate Agency Securities [Member] | Other Government National Mortgage Association [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 119,622,000 [2],[3],[4],[5],[9] 108,194,000 [2],[6],[7],[8]
Investment Owned Description Other Government National Mortgage Association [2],[3],[4],[5],[9] Other Government National Mortgage Association [2],[6],[7],[8]
Fair Value 13,006,000 [2],[3],[4],[5],[9] 11,987,000 [2],[6],[7],[8]
Interest Only - Floating Rate Agency Securities [Member] | Other Government National Mortgage Association [Member] | Minimum [Member]
    
Schedule of Investments [Line Items]    
Rate 1.64% [2],[3],[4],[5] 1.64% [2],[6],[7],[8]
Maturity 2042-11 [2],[3],[4],[5] 2042-11 [2],[6],[7],[8]
Interest Only - Floating Rate Agency Securities [Member] | Other Government National Mortgage Association [Member] | Maximum [Member]
    
Schedule of Investments [Line Items]    
Rate 6.59% [2],[3],[4],[5] 6.58% [2],[6],[7],[8]
Maturity 2063-08 [2],[3],[4],[5] 2063-08 [2],[6],[7],[8]
Interest Only - Floating Rate Agency Securities [Member] | Resecuritization of Government National Mortgage Association [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 22,472,000 [2],[3],[4],[5],[9] 22,796,000 [2],[6],[7],[8],[9]
Investment Owned Description Resecuritization of Government National Mortgage Association (w) [2],[3],[4],[5],[9] Resecuritization of Government National Mortgage Association (t) [2],[6],[7],[8],[9]
Rate 4.35% [2],[3],[4],[5],[9] 4.34% [2],[6],[7],[8],[9]
Maturity 2060-08 [2],[3],[4],[5],[9] 2060-08 [2],[6],[7],[8],[9]
Fair Value 2,307,000 [2],[3],[4],[5],[9] 2,352,000 [2],[6],[7],[8],[9]
Floating Rate Agency Securities [Member]
    
Schedule of Investments [Line Items]    
Investment owned as a percentage of equity 8.59% [1],[2],[3],[4],[5] 8.30% [1],[2],[6],[7],[8]
Fair Value 54,106,000 [2],[3],[4],[5] 51,990,000 [2],[6],[7],[8]
Investment Owned, at Cost 52,598,000 [2],[3],[4],[5] 50,969,000 [2],[6],[7],[8]
Agency Securities [Member]
    
Schedule of Investments [Line Items]    
Investment owned as a percentage of equity 177.47% [1],[2],[3],[4],[5] 164.58% [1],[2],[6],[7],[8]
Fair Value 1,118,157,000 [2],[3],[4],[5] 1,030,346,000 [2],[6],[7],[8]
Investment Owned, at Cost 1,118,268,000 [2],[3],[4],[5] 1,043,176,000 [2],[6],[7],[8]
Principal And Interest - Private Label Securities [Member]
    
Schedule of Investments [Line Items]    
Investment owned as a percentage of equity 82.33% [1],[2],[3],[4] 97.40% [1],[2],[6],[7]
Fair Value 518,746,000 [2],[3],[4] 609,766,000 [2],[6],[7]
Investment Owned, at Cost 476,235,000 [2],[3],[4] 555,708,000 [2],[6],[7]
Principal And Interest - Private Label Securities [Member] | Various Issuer [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 812,551,000 [2],[3],[4] 920,032,000 [2],[6],[7]
Investment Owned Description Various [2],[3],[4] Various [2],[6],[7]
Fair Value 518,746,000 [2],[3],[4] 609,766,000 [2],[6],[7]
Principal And Interest - Private Label Securities [Member] | Various Issuer [Member] | Minimum [Member]
    
Schedule of Investments [Line Items]    
Rate 0.21% [2],[3],[4] 0.24% [2],[6],[7]
Maturity 2019-05 [2],[3],[4] 2019-05 [2],[6],[7]
Principal And Interest - Private Label Securities [Member] | Various Issuer [Member] | Maximum [Member]
    
Schedule of Investments [Line Items]    
Rate 9.35% [2],[3],[4] 9.35% [2],[6],[7]
Maturity 2048-12 [2],[3],[4] 2050-06 [2],[6],[7]
Principal Only - Private Label Securities [Member]
    
Schedule of Investments [Line Items]    
Investment owned as a percentage of equity 0.44% [1],[2],[3],[4] 0.45% [1],[2],[6],[7]
Fair Value 2,784,000 [2],[3],[4] 2,784,000 [2],[6],[7]
Investment Owned, at Cost 2,540,000 [2],[3],[4] 2,477,000 [2],[6],[7]
Principal Only - Private Label Securities [Member] | Various Issuer [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 5,800,000 [2],[3],[4] 5,800,000 [2],[6],[7]
Investment Owned Description Various [2],[3],[4] Various [2],[6],[7]
Rate 0.00% [2],[3],[4] 0.00% [2],[6],[7]
Maturity   2030-08 [2],[6],[7]
Fair Value 2,784,000 [2],[3],[4] 2,784,000 [2],[6],[7]
Principal Only - Private Label Securities [Member] | Various Issuer [Member] | Minimum [Member]
    
Schedule of Investments [Line Items]    
Maturity 2030-08 [2],[3],[4]  
Principal Only - Private Label Securities [Member] | Various Issuer [Member] | Maximum [Member]
    
Schedule of Investments [Line Items]    
Maturity 2047-02 [2],[3],[4]  
Interest Only - Private Label Securities [Member]
    
Schedule of Investments [Line Items]    
Investment owned as a percentage of equity 0.19% [1],[2],[3],[4] 0.19% [1],[2],[6],[7]
Fair Value 1,198,000 [2],[3],[4] 1,216,000 [2],[6],[7]
Investment Owned, at Cost 497,000 [2],[3],[4] 519,000 [2],[6],[7]
Interest Only - Private Label Securities [Member] | Various Issuer [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 49,644,000 [2],[3],[4] 50,649,000 [2],[6],[7]
Investment Owned Description Various [2],[3],[4] Various [2],[6],[7]
Fair Value 1,198,000 [2],[3],[4] 1,216,000 [2],[6],[7]
Interest Only - Private Label Securities [Member] | Various Issuer [Member] | Minimum [Member]
    
Schedule of Investments [Line Items]    
Rate 0.50% [2],[3],[4] 0.50% [2],[6],[7]
Maturity 2044-06 [2],[3],[4] 2044-06 [2],[6],[7]
Interest Only - Private Label Securities [Member] | Various Issuer [Member] | Maximum [Member]
    
Schedule of Investments [Line Items]    
Rate 2.00% [2],[3],[4] 2.00% [2],[6],[7]
Maturity 2047-09 [2],[3],[4] 2047-09 [2],[6],[7]
Other Private Label Securities [Member]
    
Schedule of Investments [Line Items]    
Investment owned as a percentage of equity 0.00% [1],[2],[3],[4] 0.00% [1],[2],[6],[7]
Fair Value 0 [2],[3],[4] 0 [2],[6],[7]
Investment Owned, at Cost 332,000 [2],[3],[4] 345,000 [2],[6],[7]
Other Private Label Securities [Member] | Various Issuer [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 122,412,000 [2],[3],[4] 127,491,000 [2],[6],[7]
Investment Owned Description Various [2],[3],[4] Various [2],[6],[7]
Rate 0.00% [2],[3],[4] 0.00% [2],[6],[7]
Fair Value 0 [2],[3],[4] 0 [2],[6],[7]
Other Private Label Securities [Member] | Various Issuer [Member] | Minimum [Member]
    
Schedule of Investments [Line Items]    
Maturity 2037-06 [2],[3],[4] 2037-06 [2],[6],[7]
Other Private Label Securities [Member] | Various Issuer [Member] | Maximum [Member]
    
Schedule of Investments [Line Items]    
Maturity 2045-07 [2],[3],[4] 2045-07 [2],[6],[7]
Private Label Securities [Member]
    
Schedule of Investments [Line Items]    
Investment owned as a percentage of equity 82.96% [1],[2],[3],[4] 98.04% [1],[2],[6],[7]
Fair Value 522,728,000 [2],[3],[4] 613,766,000 [2],[6],[7]
Investment Owned, at Cost 479,604,000 [2],[3],[4] 559,049,000 [2],[6],[7]
Mortgage-Backed Securities [Member]
    
Schedule of Investments [Line Items]    
Investment owned as a percentage of equity 260.43% [1],[2],[3],[4] 262.62% [1],[2],[6],[7]
Fair Value 1,640,885,000 [2],[3],[4] 1,644,112,000 [2],[6],[7]
Investment Owned, at Cost 1,597,872,000 [2],[3],[4] 1,602,225,000 [2],[6],[7]
Asset-backed Securities [Member]
    
Schedule of Investments [Line Items]    
Investment owned as a percentage of equity 7.53% [1],[2],[3],[4] 6.08% [1],[2],[6],[7]
Fair Value 47,458,000 [2],[3],[4] 38,069,000 [2],[6],[7]
Investment Owned, at Cost 47,600,000 [2],[3],[4] 38,758,000 [2],[6],[7]
Asset-backed Securities [Member] | Various Issuer [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 51,659,000 [2],[3],[4] 42,822,000 [2],[6],[7]
Investment Owned Description Various [2],[3],[4] Various [2],[6],[7]
Fair Value 47,458,000 [2],[3],[4] 38,069,000 [2],[6],[7]
Asset-backed Securities [Member] | Various Issuer [Member] | Minimum [Member]
    
Schedule of Investments [Line Items]    
Rate 0.00% [2],[3],[4] 0.00% [2],[6],[7]
Maturity 2017-06 [2],[3],[4] 2017-06 [2],[6],[7]
Asset-backed Securities [Member] | Various Issuer [Member] | Maximum [Member]
    
Schedule of Investments [Line Items]    
Rate 9.74% [2],[3],[4] 9.74% [2],[6],[7]
Maturity 2040-12 [2],[3],[4] 2040-12 [2],[6],[7]
Commercial Mortgage Loans [Member]
    
Schedule of Investments [Line Items]    
Investment owned as a percentage of equity 6.98% [1],[10],[2],[3],[4] 3.82% [1],[11],[2],[6],[7]
Fair Value 44,005,000 [10],[2],[3],[4] 23,887,000 [11],[2],[6],[7]
Investment Owned, at Cost 43,790,000 [10],[2],[3],[4] 23,212,000 [11],[2],[6],[7]
Commercial Mortgage Loans [Member] | Various Issuer [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 50,962,000 [10],[2],[3],[4] 26,227,000 [11],[2],[6],[7]
Investment Owned Description Various [10],[2],[3],[4] Various [11],[2],[6],[7]
Fair Value 44,005,000 [10],[2],[3],[4] 23,887,000 [11],[2],[6],[7]
Commercial Mortgage Loans [Member] | Various Issuer [Member] | Minimum [Member]
    
Schedule of Investments [Line Items]    
Rate 0.00% [10],[2],[3],[4] 0.00% [11],[2],[6],[7]
Maturity 2014-04 [10],[2],[3],[4] 2014-06 [11],[2],[6],[7]
Commercial Mortgage Loans [Member] | Various Issuer [Member] | Maximum [Member]
    
Schedule of Investments [Line Items]    
Rate 7.25% [10],[2],[3],[4] 7.25% [11],[2],[6],[7]
Maturity 2016-12 [10],[2],[3],[4] 2016-12 [11],[2],[6],[7]
Residential Mortgage Loans [Member]
    
Schedule of Investments [Line Items]    
Investment owned as a percentage of equity 3.74% [1],[2],[3],[4] 3.84% [1],[2],[6],[7]
Fair Value 23,566,000 [2],[3],[4] 24,062,000 [2],[6],[7]
Investment Owned, at Cost 23,826,000 [2],[3],[4] 24,062,000 [2],[6],[7]
Residential Mortgage Loans [Member] | Various Issuer [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 35,859,000 [2],[3],[4] 36,218,000 [2],[6],[7]
Investment Owned Description Various [2],[3],[4] Various [2],[6],[7]
Rate 0.00% [2],[3],[4] 0.00% [2],[6],[7]
Fair Value 23,566,000 [2],[3],[4] 24,062,000 [2],[6],[7]
Residential Mortgage Loans [Member] | Various Issuer [Member] | Minimum [Member]
    
Schedule of Investments [Line Items]    
Maturity 2024-08 [2],[3],[4] 2024-08
Residential Mortgage Loans [Member] | Various Issuer [Member] | Maximum [Member]
    
Schedule of Investments [Line Items]    
Maturity 2042-10 [2],[3],[4] 2042-10
Residential Real Estate [Member]
    
Schedule of Investments [Line Items]    
Investment owned as a percentage of equity 0.02% [1],[12],[2],[3],[4]  
Fair Value 97,000 [12],[2],[3],[4]  
Investment Owned, at Cost 101,000 [12],[2],[3],[4]  
Residential Real Estate [Member] | Single-Family Houses [Member]
    
Schedule of Investments [Line Items]    
Current Principal/Notional Amount 1 [12],[2],[3],[4]  
Investment Owned Description Single-Family Houses [12],[2],[3],[4]  
Fair Value 97,000 [12],[2],[3],[4]  
Long Investments [Member]
    
Schedule of Investments [Line Items]    
Investment owned as a percentage of equity 278.70% [1],[2],[3],[4] 276.36% [1],[2],[6],[7]
Current Principal/Notional Amount 2,481,844,000 2,478,291,000
Fair Value 1,756,011,000 [2],[3],[4] 1,730,130,000 [2],[6],[7]
Investment Owned, at Cost 1,713,189,000 [2],[3],[4] 1,688,257,000 [2],[6],[7]
Long Investments [Member] | North America [Member]
    
Schedule of Investments [Line Items]    
Investment owned as a percentage of equity 274.55% 275.44%
Current Principal/Notional Amount 2,449,649,000 2,470,650,000
Fair Value 1,729,893,000 1,724,370,000
Investment Owned, at Cost 1,686,738,000 1,682,533,000
Long Investments [Member] | Europe [Member]
    
Schedule of Investments [Line Items]    
Investment owned as a percentage of equity 4.15% 0.92%
Current Principal/Notional Amount 32,195,000 7,641,000
Fair Value 26,118,000 5,760,000
Investment Owned, at Cost 26,451,000 5,724,000
Long Investments [Member] | Federal National Mortgage Association [Member]
    
Schedule of Investments [Line Items]    
Investment owned as a percentage of equity 124.05% 100.85%
Long Investments [Member] | Federal Home Loan Mortgage Corporation [Member]
    
Schedule of Investments [Line Items]    
Investment owned as a percentage of equity 41.24% 51.37%
Long Investments [Member] | Government National Mortgage Association [Member]
    
Schedule of Investments [Line Items]    
Investment owned as a percentage of equity 12.18% 12.36%
Commercial Mortgage Loan With Extendable Maturity [Member] | Commercial Mortgage Loans [Member] | Various Issuer [Member]
    
Schedule of Investments [Line Items]    
Fair Value   $ 5,000,000
[1] Classification percentages are based on Total Equity.
[2] See Note 2 and Note 3 in Notes to Consolidated Financial Statements.
[3] 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 EquityUnrated but Agency-Guaranteed 177.47%A/A/A 0.03%Baa/BBB/BBB 2.31%Ba/BB/BB or below 84.29%Unrated 14.60%
[4] The following table details the breakout by geographical region of long investments, investments sold short, repurchase agreements, and financial derivatives–assets. All financial derivatives–liabilities were concentrated in North America.Region Current Principal/Notional Value/Number of Shares/Number of Properties Cost/(Proceeds) Fair Value Percent ofEquityLong Investments: (In thousands, Expressed in U.S. Dollars) North America 2,449,649 $1,686,738 $1,729,893 274.55 %Europe 32,195 26,451 26,118 4.15 %Total 2,481,844 $1,713,189 $1,756,011 278.70 %Investments Sold Short: North America (TBAs and Government Debt) (756,627) $(789,167) $(787,667) (125.01)%Europe (Government Debt) (22,208) (23,481) (24,195) (3.84)%North America (Common Stock) (941) (7,004) (6,903) (1.10)%Total $(819,652) $(818,765) (129.95)%Repurchase Agreements: North America 4,944 $4,944 $4,944 0.78 %Europe 24,931 24,928 24,931 3.96 %Total 29,875 $29,872 $29,875 4.74 %Financial Derivatives–Assets: North America (583,909) $55,230 $57,558 9.14 %Europe (8,980) — 2 — %Total (592,889) $55,230 $57,560 9.14 %
[5] At March 31, 2014, 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 124.05%, 41.24%, and 12.18% of equity, respectively.
[6] The following table details the breakout by geographical region of long investments, investments sold short, and repurchase agreements. All financial derivatives were concentrated in North America.Region Current Principal/Number of Shares Cost/(Proceeds) Fair Value Percent ofEquityLong Investments: (In thousands, Expressed in U.S. Dollars) North America 2,470,650 $1,682,533 $1,724,370 275.44 %Europe 7,641 5,724 5,760 0.92 %Total 2,478,291 $1,688,257 $1,730,130 276.36 %Investments Sold Short: North America (TBAs and Government Debt) (804,888) $(833,656) $(831,564) (132.82)%Europe (Government Debt) (7,337) (7,633) (7,681) (1.23)%North America (Common Stock) (763) (6,313) (6,369) (1.02)%Total $(847,602) $(845,614) (135.07)%Repurchase Agreements: North America 19,675 $19,675 $19,675 3.15 %Europe 8,287 8,268 8,287 1.32 %Total 27,962 $27,943 $27,962 4.47 %
[7] The table below shows the ratings on the Company's long investments 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 ofEquityUnrated but Agency-Guaranteed 164.58%A/A/A 0.34%Baa/BBB/BBB 2.97%Ba/BB/BB or below 97.95%Unrated 10.52%
[8] At December 31, 2013, 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 100.85%, 51.37%, and 12.36% of equity, respectively.
[9] Private trust 100% backed by interest in Government National Mortgage Association collateralized mortgage obligation certificates.
[10] Includes non-performing commercial loans in the amount of $20.0 million whereby principal and/or interest is past due and a maturity date is not applicable.
[11] Includes a loan with a fair value in the amount of $5.0 million where the maturity date may be extended through November 4, 2015 as well as non-performing commercial mortgage loans.
[12] Number of properties not shown in thousands, represents actual number of properties owned.