Consolidated Condensed Schedule Of Investments (Long Investments) (USD $) In Thousands, unless otherwise specified	9 Months Ended		12 Months Ended
	Sep. 30, 2013		Dec. 31, 2012
Schedule of Investments [Line Items]
Fair Value	$ 1,851,751		$ 1,375,116
Investment Owned, at Cost	1,806,749		1,328,153
Percentage collaterallized by GNRCMO certificates	100.00%		100.00%
Unrated But Agency-Guaranteed [Member]
Schedule of Investments [Line Items]
Long investment holdings as a percentage of stockholders' equity	175.66%		161.52%
Long Investment AAA Rating [Member]
Schedule of Investments [Line Items]
Long investment holdings as a percentage of stockholders' equity	0.00%		0.01%
Long Investment AA Rating [Member]
Schedule of Investments [Line Items]
Long investment holdings as a percentage of stockholders' equity	0.00%		0.26%
Long Investment A Rating [Member]
Schedule of Investments [Line Items]
Long investment holdings as a percentage of stockholders' equity	0.48%		1.02%
Long Investment BBB Rating [Member]
Schedule of Investments [Line Items]
Long investment holdings as a percentage of stockholders' equity	2.53%		3.70%
Long Investment BB Rating [Member]
Schedule of Investments [Line Items]
Long investment holdings as a percentage of stockholders' equity	110.32%		102.40%
Long Investment Unrated Rating [Member]
Schedule of Investments [Line Items]
Long investment holdings as a percentage of stockholders' equity	5.03%		2.66%
Principal And Interest - Fixed Rate Agency Securities [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of net assets	144.27%	[1],[2],[3],[4]	148.21%	[1],[2],[5],[6]
Fair Value	908,587	[2],[3],[4]	750,454	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 74,364 Federal National Mortgage Association Pool, 3.50% 2043-02 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	74,364	[2],[3],[4]
Description	Federal National Mortgage Association Pool	[2],[3],[4]
Rate	3.50%	[2],[3],[4]
Maturity	2043-02	[2],[3],[4]
Fair Value	75,049	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 39,099 Federal National Mortgage Association Pool, 3.50% 2043-01 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	39,099	[2],[3],[4]
Description	Federal National Mortgage Association Pool	[2],[3],[4]
Rate	3.50%	[2],[3],[4]
Maturity	2043-01	[2],[3],[4]
Fair Value	39,325	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 20,503 Federal Home Loan Mortgage Corporation Pool, 5.50% 2039-10 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	20,503	[2],[3],[4]
Description	Federal Home Loan Mortgage Corporation Pool	[2],[3],[4]
Rate	5.50%	[2],[3],[4]
Maturity	2039-10	[2],[3],[4]
Fair Value	22,245	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 16,299 Federal National Mortgage Association Pool, 4.50% 2041-09 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	16,299	[2],[3],[4]
Description	Federal National Mortgage Association Pool	[2],[3],[4]
Rate	4.50%	[2],[3],[4]
Maturity	2041-09	[2],[3],[4]
Fair Value	17,457	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 17,060 Federal National Mortgage Association Pool, 3.50% 2042-08 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	17,060	[2],[3],[4]
Description	Federal National Mortgage Association Pool	[2],[3],[4]
Rate	3.50%	[2],[3],[4]
Maturity	2042-08	[2],[3],[4]
Fair Value	17,386	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 15,867 Federal National Mortgage Association Pool, 5.00% 2041-08 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	15,867	[2],[3],[4]
Description	Federal National Mortgage Association Pool	[2],[3],[4]
Rate	5.00%	[2],[3],[4]
Maturity	2041-08	[2],[3],[4]
Fair Value	17,255	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 16,822 Federal National Mortgage Association Pool, 3.00% 2028-06 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	16,822	[2],[3],[4]
Description	Federal National Mortgage Association Pool	[2],[3],[4]
Rate	3.00%	[2],[3],[4]
Maturity	2028-06	[2],[3],[4]
Fair Value	17,208	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 15,384 Federal National Mortgage Association Pool, 4.50% 2041-10 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	15,384	[2],[3],[4]
Description	Federal National Mortgage Association Pool	[2],[3],[4]
Rate	4.50%	[2],[3],[4]
Maturity	2041-10	[2],[3],[4]
Fair Value	16,473	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 15,142 Federal Home Loan Mortgage Corporation Pool, 5.00% 2041-07 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	15,142	[2],[3],[4]
Description	Federal Home Loan Mortgage Corporation Pool	[2],[3],[4]
Rate	5.00%	[2],[3],[4]
Maturity	2041-07	[2],[3],[4]
Fair Value	16,392	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 13,490 Federal Home Loan Mortgage Corporation Pool 4.00% 2043-08 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	13,490	[2],[3],[4]
Description	Federal Home Loan Mortgage Corporation Pool	[2],[3],[4]
Rate	4.00%	[2],[3],[4]
Maturity	2043-08	[2],[3],[4]
Fair Value	14,172	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 12,662 Federal National Mortgage Association Pool, 5.00% 2041-03 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	12,662	[2],[3],[4]
Description	Federal National Mortgage Association Pool	[2],[3],[4]
Rate	5.00%	[2],[3],[4]
Maturity	2041-03	[2],[3],[4]
Fair Value	13,765	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 11,639 Federal National Mortgage Association Pool, 4.00% 2043-10 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	11,639	[2],[3],[4]
Description	Federal National Mortgage Association Pool	[2],[3],[4]
Rate	4.00%	[2],[3],[4]
Maturity	2043-10	[2],[3],[4]
Fair Value	12,259	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 12,022 Federal National Mortgage Association Pool, 3.00% 2042-08 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	12,022	[2],[3],[4]
Description	Federal National Mortgage Association Pool	[2],[3],[4]
Rate	3.00%	[2],[3],[4]
Maturity	2042-08	[2],[3],[4]
Fair Value	11,759	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 10,298 Federal National Mortgage Association Pool, 5.00% 2041-07 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	10,298	[2],[3],[4]
Description	Federal National Mortgage Association Pool	[2],[3],[4]
Rate	5.00%	[2],[3],[4]
Maturity	2041-07	[2],[3],[4]
Fair Value	11,214	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 10,371 Federal National Mortgage Association Pool, 4.50% 2041-09 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	10,371	[2],[3],[4]
Description	Federal National Mortgage Association Pool	[2],[3],[4]
Rate	4.50%	[2],[3],[4]
Maturity	2041-09	[2],[3],[4]
Fair Value	11,079	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 9,936 Federal Home Loan Mortgage Corporation Pool, 4.00% 2043-07 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	9,936	[2],[3],[4]
Description	Federal Home Loan Mortgage Corporation Pool	[2],[3],[4]
Rate	4.00%	[2],[3],[4]
Maturity	2043-07	[2],[3],[4]
Fair Value	10,420	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 9,152 Federal National Mortgage Association Pool 4.00% 2043-08 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	9,152	[2],[3],[4]
Description	Federal National Mortgage Association Pool	[2],[3],[4]
Rate	4.00%	[2],[3],[4]
Maturity	2043-08	[2],[3],[4]
Fair Value	9,630	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 9,974 Federal National Mortgage Association Pool 3.00% 2043-08 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	9,974	[2],[3],[4]
Description	Federal National Mortgage Association Pool	[2],[3],[4]
Rate	3.00%	[2],[3],[4]
Maturity	2043-08	[2],[3],[4]
Fair Value	9,592	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 9,798 Federal Home Loan Mortgage Corporation Pool, 3.00% 2043-02 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	9,798	[2],[3],[4]
Description	Federal Home Loan Mortgage Corporation Pool	[2],[3],[4]
Rate	3.00%	[2],[3],[4]
Maturity	2043-02	[2],[3],[4]
Fair Value	9,547	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 8,880 Federal Home Loan Mortgage Corporation Pool, 4.50% 2041-10 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	8,880	[2],[3],[4]
Description	Federal Home Loan Mortgage Corporation Pool	[2],[3],[4]
Rate	4.50%	[2],[3],[4]
Maturity	2041-10	[2],[3],[4]
Fair Value	9,476	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 7,744 Federal National Mortgage Association Pool, 4.50% 2026-04 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	7,744	[2],[3],[4]
Description	Federal National Mortgage Association Pool	[2],[3],[4]
Rate	4.50%	[2],[3],[4]
Maturity	2026-04	[2],[3],[4]
Fair Value	8,227	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 7,443 Federal National Mortgage Association Pool 3.50% 2042-11 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	7,443	[2],[3],[4]
Description	Federal National Mortgage Association Pool	[2],[3],[4]
Rate	3.50%	[2],[3],[4]
Maturity	2042-11	[2],[3],[4]
Fair Value	7,589	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 6,886 Federal Home Loan Mortgage Corporation Pool, 4.00% 2043-10 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	6,886	[2],[3],[4]
Description	Federal Home Loan Mortgage Corporation Pool	[2],[3],[4]
Rate	4.00%	[2],[3],[4]
Maturity	2043-10	[2],[3],[4]
Fair Value	7,170	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 6,315 Federal National Mortgage Association Pool, 5.50% 2039-10 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	6,315	[2],[3],[4]
Description	Federal National Mortgage Association Pool	[2],[3],[4]
Rate	5.50%	[2],[3],[4]
Maturity	2039-10	[2],[3],[4]
Fair Value	6,948	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 6,200 Federal National Morgage Association Pool 4.00% 2043-10 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	6,200	[2],[3],[4]
Description	Federal National Mortgage Association Pool	[2],[3],[4]
Rate	4.00%	[2],[3],[4]
Maturity	2043-11	[2],[3],[4]
Fair Value	6,475	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 6,070 Federal National Mortgage Association Pool, 4.00% 2043-08 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	6,070	[2],[3],[4]
Description	Federal National Mortgage Association Pool	[2],[3],[4]
Rate	4.00%	[2],[3],[4]
Maturity	2043-08	[2],[3],[4]
Fair Value	6,398	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 6,052 Federal National Mortgage Association Pool, 4.00% 2043-10 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	6,052	[2],[3],[4]
Description	Federal National Mortgage Association Pool	[2],[3],[4]
Rate	4.00%	[2],[3],[4]
Maturity	2043-10	[2],[3],[4]
Fair Value	6,348	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 6,433 Federal National Mortgage Association Pool, 3.00% 2042-04 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	6,433	[2],[3],[4]
Description	Federal National Mortgage Association Pool	[2],[3],[4]
Rate	3.00%	[2],[3],[4]
Maturity	2042-04	[2],[3],[4]
Fair Value	6,292	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 5,918 Federal National Mortgage Association Pool, 4.00% 2043-08 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	5,918	[2],[3],[4]
Description	Federal National Mortgage Association Pool	[2],[3],[4]
Rate	4.00%	[2],[3],[4]
Maturity	2043-08	[2],[3],[4]
Fair Value	6,227	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 6,332 Federal Home Loan Mortgage Corporation Pool, 3.00% 2043-01 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	6,332	[2],[3],[4]
Description	Federal Home Loan Mortgage Corporation Pool	[2],[3],[4]
Rate	3.00%	[2],[3],[4]
Maturity	2043-01	[2],[3],[4]
Fair Value	6,171	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 5,602 Government National Mortgage Association Pool, 4.46% 2063-02 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	5,602	[2],[3],[4]
Description	Government National Mortgage Association Pool	[2],[3],[4]
Rate	4.46%	[2],[3],[4]
Maturity	2063-02	[2],[3],[4]
Fair Value	6,159	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 5,728 Federal Home Loan Mortgage Corporation Pool, 4.00% 2043-08 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	5,728	[2],[3],[4]
Description	Federal Home Loan Mortgage Corporation Pool	[2],[3],[4]
Rate	4.00%	[2],[3],[4]
Maturity	2043-08	[2],[3],[4]
Fair Value	6,007	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 6,118 Federal Home Loan Mortgage Corporation Pool, 3.00% 2043-04 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	6,118	[2],[3],[4]
Description	Federal Home Loan Mortgage Corporation Pool	[2],[3],[4]
Rate	3.00%	[2],[3],[4]
Maturity	2043-04	[2],[3],[4]
Fair Value	5,964	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 5,396 Government National Mortgage Association Pool, 4.54% 2062-11 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	5,396	[2],[3],[4]
Description	Government National Mortgage Association Pool	[2],[3],[4]
Rate	4.54%	[2],[3],[4]
Maturity	2062-11	[2],[3],[4]
Fair Value	5,945	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 5,740 Federal National Mortgage Association Pool, 3.50% 2043-06 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	5,740	[2],[3],[4]
Description	Federal National Mortgage Association Pool	[2],[3],[4]
Rate	3.50%	[2],[3],[4]
Maturity	2043-06	[2],[3],[4]
Fair Value	5,851	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 5,315 Government National Mortgage Association Pool, 4.63% 2061-06 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	5,315	[2],[3],[4]
Description	Government National Mortgage Association Pool	[2],[3],[4]
Rate	4.63%	[2],[3],[4]
Maturity	2061-06	[2],[3],[4]
Fair Value	5,809	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 5,990 Federal National Mortgage Association Pool, 3.00% 2043-08 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	5,990	[2],[3],[4]
Description	Federal National Mortgage Association Pool	[2],[3],[4]
Rate	3.00%	[2],[3],[4]
Maturity	2043-08	[2],[3],[4]
Fair Value	5,761	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 5,378 Federal National Mortgage Association Pool, 4.00% 2026-07 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	5,378	[2],[3],[4]
Description	Federal National Mortgage Association Pool	[2],[3],[4]
Rate	4.00%	[2],[3],[4]
Maturity	2026-07	[2],[3],[4]
Fair Value	5,719	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 5,184 Government National Mortgage Association Pool, 4.58% 2062-10 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	5,184	[2],[3],[4]
Description	Government National Mortgage Association Pool	[2],[3],[4]
Rate	4.58%	[2],[3],[4]
Maturity	2062-10	[2],[3],[4]
Fair Value	5,712	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 5,185 Government National Mortgage Association Pool, 4.60% 2062-06 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	5,185	[2],[3],[4]
Description	Government National Mortgage Association Pool	[2],[3],[4]
Rate	4.60%	[2],[3],[4]
Maturity	2062-06	[2],[3],[4]
Fair Value	5,707	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 5,163 Federal Home Loan Mortgage Corporation Pool, 4.50% 2043-10 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	5,163	[2],[3],[4]
Description	Federal Home Loan Mortgage Corporation Pool	[2],[3],[4]
Rate	4.50%	[2],[3],[4]
Maturity	2043-10	[2],[3],[4]
Fair Value	5,502	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 5,046 Federal National Mortgage Association Pool 4.00% 2043-01 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	5,046	[2],[3],[4]
Description	Federal National Mortgage Association Pool	[2],[3],[4]
Rate	4.00%	[2],[3],[4]
Maturity	2043-01	[2],[3],[4]
Fair Value	5,306	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 5,037 Federal Home Loan Mortgage Corporation Pool, 4.00% 2042-05 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	5,037	[2],[3],[4]
Description	Federal Home Loan Mortgage Corporation Pool	[2],[3],[4]
Rate	4.00%	[2],[3],[4]
Maturity	2042-05	[2],[3],[4]
Fair Value	5,267	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,826 Federal Home Loan Mortgage Corporation Pool, 4.00% 2043-08 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	4,826	[2],[3],[4]
Description	Federal Home Loan Mortgage Corporation Pool	[2],[3],[4]
Rate	4.00%	[2],[3],[4]
Maturity	2043-08	[2],[3],[4]
Fair Value	5,047	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,984 Federal National Mortgage Association Pool, 3.50% 2043-06 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	4,984	[2],[3],[4]
Description	Federal National Mortgage Association Pool	[2],[3],[4]
Rate	3.50%	[2],[3],[4]
Maturity	2043-06	[2],[3],[4]
Fair Value	5,030	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,746 Federal National Mortgage Association Pool 4.00% 2042-04 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	4,746	[2],[3],[4]
Description	Federal National Mortgage Association Pool	[2],[3],[4]
Rate	4.00%	[2],[3],[4]
Maturity	2042-04	[2],[3],[4]
Fair Value	4,982	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 5,063 Federal Home Loan Mortgage Corporation Pool, 3.00% 2043-06 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	5,063	[2],[3],[4]
Description	Federal Home Loan Mortgage Corporation Pool	[2],[3],[4]
Rate	3.00%	[2],[3],[4]
Maturity	2043-06	[2],[3],[4]
Fair Value	4,934	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,500 Federal National Mortgage Association Pool, 5.00% 2043-10 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	4,500	[2],[3],[4]
Description	Federal National Mortgage Association Pool	[2],[3],[4]
Rate	5.00%	[2],[3],[4]
Maturity	2043-10	[2],[3],[4]
Fair Value	4,903	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,603 Federal Home Loan Mortgage Corporation Pool, 4.00% 2043-08 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	4,603	[2],[3],[4]
Description	Federal Home Loan Mortgage Corporation Pool	[2],[3],[4]
Rate	4.00%	[2],[3],[4]
Maturity	2043-08	[2],[3],[4]
Fair Value	4,827	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,485 Federal National Mortgage Association Pool, 4.50% 2043-10 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	4,485	[2],[3],[4]
Description	Federal National Mortgage Association Pool	[2],[3],[4]
Rate	4.50%	[2],[3],[4]
Maturity	2043-10	[2],[3],[4]
Fair Value	4,814	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,494 Federal National Mortgage Association Pool, 4.50% 2043-08 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	4,494	[2],[3],[4]
Description	Federal National Mortgage Association Pool	[2],[3],[4]
Rate	4.50%	[2],[3],[4]
Maturity	2043-08	[2],[3],[4]
Fair Value	4,807	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,697 Federal National Mortgage Association Pool, 3.50% 2043-08 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	4,697	[2],[3],[4]
Description	Federal National Mortgage Association Pool	[2],[3],[4]
Rate	3.50%	[2],[3],[4]
Maturity	2043-08	[2],[3],[4]
Fair Value	4,789	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,455 Federal National Mortgage Association Pool, 4.50% 2041-08 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	4,455	[2],[3],[4]
Description	Federal National Mortgage Association Pool	[2],[3],[4]
Rate	4.50%	[2],[3],[4]
Maturity	2041-08	[2],[3],[4]
Fair Value	4,765	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,869 Federal National Mortgage Association Pool, 3.00% 2042-06 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	4,869	[2],[3],[4]
Description	Federal National Mortgage Association Pool	[2],[3],[4]
Rate	3.00%	[2],[3],[4]
Maturity	2042-06	[2],[3],[4]
Fair Value	4,763	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,326 Federal National Mortgage Association Pool, 5.00% 2040-11 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	4,326	[2],[3],[4]
Description	Federal National Mortgage Association Pool	[2],[3],[4]
Rate	5.00%	[2],[3],[4]
Maturity	2040-11	[2],[3],[4]
Fair Value	4,699	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,585 Federal National Mortgage Association Pool, 3.50% 2042-07 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	4,585	[2],[3],[4]
Description	Federal National Mortgage Association Pool	[2],[3],[4]
Rate	3.50%	[2],[3],[4]
Maturity	2042-07	[2],[3],[4]
Fair Value	4,673	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,376 Federal Home Loan Mortgage Corporation Pool, 4.50% 2043-09 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	4,376	[2],[3],[4]
Description	Federal Home Loan Mortgage Corporation Pool	[2],[3],[4]
Rate	4.50%	[2],[3],[4]
Maturity	2043-09	[2],[3],[4]
Fair Value	4,665	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,701 Federal Home Loan Mortgage Corporation Pool, 3.00% 2043-02 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	4,701	[2],[3],[4]
Description	Federal Home Loan Mortgage Corporation Pool	[2],[3],[4]
Rate	3.00%	[2],[3],[4]
Maturity	2043-02	[2],[3],[4]
Fair Value	4,581	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,038 Federal National Mortgage Association Pool, 5.00% 2043-10 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	4,038	[2],[3],[4]
Description	Federal National Mortgage Association Pool	[2],[3],[4]
Rate	5.00%	[2],[3],[4]
Maturity	2043-10	[2],[3],[4]
Fair Value	4,395	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,173 Federal Home Loan Mortgage Corporation Pool, 4.00% 2043-08 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	4,173	[2],[3],[4]
Description	Federal Home Loan Mortgage Corporation Pool	[2],[3],[4]
Rate	4.00%	[2],[3],[4]
Maturity	2043-08	[2],[3],[4]
Fair Value	4,369	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,355 Federal National Mortgage Association Pool, 3.00% 2042-03 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	4,355	[2],[3],[4]
Description	Federal National Mortgage Association Pool	[2],[3],[4]
Rate	3.00%	[2],[3],[4]
Maturity	2042-03	[2],[3],[4]
Fair Value	4,260	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,247 Federal Home Loan Mortgage Corporation Pool, 3.50% 2043-06 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	4,247	[2],[3],[4]
Description	Federal Home Loan Mortgage Corporation Pool	[2],[3],[4]
Rate	3.50%	[2],[3],[4]
Maturity	2043-06	[2],[3],[4]
Fair Value	4,259	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,814 Government National Mortgage Association Pool, 4.80% 2061-02 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	3,814	[2],[3],[4]
Description	Government National Mortgage Association Pool	[2],[3],[4]
Rate	4.80%	[2],[3],[4]
Maturity	2061-02	[2],[3],[4]
Fair Value	4,174	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,944 Federal Home Loan Mortgage Corporation Pool, 4.00% 2043-10 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	3,944	[2],[3],[4]
Description	Federal Home Loan Mortgage Corporation Pool	[2],[3],[4]
Rate	4.00%	[2],[3],[4]
Maturity	2043-10	[2],[3],[4]
Fair Value	4,133	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,162 Federal National Mortgage Association Pool, 3.00% 2042-08 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	4,162	[2],[3],[4]
Description	Federal National Mortgage Association Pool	[2],[3],[4]
Rate	3.00%	[2],[3],[4]
Maturity	2042-08	[2],[3],[4]
Fair Value	4,071	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,877 Federal Home Loan Mortgage Corporation Pool, 3.00% 2028-03 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	3,877	[2],[3],[4]
Description	Federal Home Loan Mortgage Corporation Pool	[2],[3],[4]
Rate	3.00%	[2],[3],[4]
Maturity	2028-03	[2],[3],[4]
Fair Value	4,014	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,567 Government National Mortgage Association Pool, 4.75% 2061-01 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	3,567	[2],[3],[4]
Description	Government National Mortgage Association Pool	[2],[3],[4]
Rate	4.75%	[2],[3],[4]
Maturity	2061-01	[2],[3],[4]
Fair Value	3,891	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,452 Government National Mortgage Association Pool, 4.66% 2063-01 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	3,452	[2],[3],[4]
Description	Government National Mortgage Association Pool	[2],[3],[4]
Rate	4.66%	[2],[3],[4]
Maturity	2063-01	[2],[3],[4]
Fair Value	3,826	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,617 Federal National Mortgage Association Pool, 4.00% 2043-08 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	3,617	[2],[3],[4]
Description	Federal National Mortgage Association Pool	[2],[3],[4]
Rate	4.00%	[2],[3],[4]
Maturity	2043-08	[2],[3],[4]
Fair Value	3,797	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,608 Federal National Mortgage Association Pool 4.00% 2043-08 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	3,608	[2],[3],[4]
Description	Federal National Mortgage Association Pool	[2],[3],[4]
Rate	4.00%	[2],[3],[4]
Maturity	2043-08	[2],[3],[4]
Fair Value	3,797	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,582 Federal National Mortgage Association Pool, 4.00% 2043-08 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	3,582	[2],[3],[4]
Description	Federal National Mortgage Association Pool	[2],[3],[4]
Rate	4.00%	[2],[3],[4]
Maturity	2043-08	[2],[3],[4]
Fair Value	3,764	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,419 Government National Mortgage Association Pool, 4.69% 2061-07 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	3,419	[2],[3],[4]
Description	Government National Mortgage Association Pool	[2],[3],[4]
Rate	4.69%	[2],[3],[4]
Maturity	2061-07	[2],[3],[4]
Fair Value	3,748	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,510 Federal National Mortgage Association Pool, 4.00% 2043-08 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	3,510	[2],[3],[4]
Description	Federal National Mortgage Association Pool	[2],[3],[4]
Rate	4.00%	[2],[3],[4]
Maturity	2043-08	[2],[3],[4]
Fair Value	3,693	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,257 Federal National Mortgage Association Pool, 5.00% 2035-10 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	3,257	[2],[3],[4]
Description	Federal National Mortgage Association Pool	[2],[3],[4]
Rate	5.00%	[2],[3],[4]
Maturity	2035-10	[2],[3],[4]
Fair Value	3,577	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,534 Federal Home Loan Mortgage Corporation Pool, 3.50% 2043-06 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	3,534	[2],[3],[4]
Description	Federal Home Loan Mortgage Corporation Pool	[2],[3],[4]
Rate	3.50%	[2],[3],[4]
Maturity	2043-06	[2],[3],[4]
Fair Value	3,556	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,443 Federal National Mortgage Association Pool, 3.50% 2043-01 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	3,443	[2],[3],[4]
Description	Federal National Mortgage Association Pool	[2],[3],[4]
Rate	3.50%	[2],[3],[4]
Maturity	2043-01	[2],[3],[4]
Fair Value	3,511	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,435 Federal Home Loan Mortgage Corporation Pool, 3.00% 2028-06 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	3,435	[2],[3],[4]
Description	Federal Home Loan Mortgage Corporation Pool	[2],[3],[4]
Rate	3.00%	[2],[3],[4]
Maturity	2028-06	[2],[3],[4]
Fair Value	3,508	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,151 Government National Mortgage Association Pool, 4.68% 2061-10 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	3,151	[2],[3],[4]
Description	Government National Mortgage Association Pool	[2],[3],[4]
Rate	4.68%	[2],[3],[4]
Maturity	2061-10	[2],[3],[4]
Fair Value	3,458	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,208 Federal National Mortgage Association Pool, 4.50% 2042-04 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	3,208	[2],[3],[4]
Description	Federal National Mortgage Association Pool	[2],[3],[4]
Rate	4.50%	[2],[3],[4]
Maturity	2042-04	[2],[3],[4]
Fair Value	3,433	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,221 Federal National Mortgage Association Pool, 4.00% 2026-06 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	3,221	[2],[3],[4]
Description	Federal National Mortgage Association Pool	[2],[3],[4]
Rate	4.00%	[2],[3],[4]
Maturity	2026-06	[2],[3],[4]
Fair Value	3,424	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,264 Federal National Mortgage Association Pool, 3.00% 2028-06 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	3,264	[2],[3],[4]
Description	Federal National Mortgage Association Pool	[2],[3],[4]
Rate	3.00%	[2],[3],[4]
Maturity	2028-06	[2],[3],[4]
Fair Value	3,384	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,156 Federal National Mortgage Association Pool, 4.50% 2041-12 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	3,156	[2],[3],[4]
Description	Federal National Mortgage Association Pool	[2],[3],[4]
Rate	4.50%	[2],[3],[4]
Maturity	2041-12	[2],[3],[4]
Fair Value	3,378	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,208 Federal Home Loan Mortgage Corporation Pool 4.00% 2043-08 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	3,208	[2],[3],[4]
Description	Federal Home Loan Mortgage Corporation Pool	[2],[3],[4]
Rate	4.00%	[2],[3],[4]
Maturity	2043-08	[2],[3],[4]
Fair Value	3,370	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,289 Federal National Mortgage Association Pool, 3.00% 2028-03 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	3,289	[2],[3],[4]
Description	Federal National Mortgage Association Pool	[2],[3],[4]
Rate	3.00%	[2],[3],[4]
Maturity	2028-03	[2],[3],[4]
Fair Value	3,365	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,098 Federal Home Loan Mortgage Corporation Pool, 4.50% 2043-09 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	3,098	[2],[3],[4]
Description	Federal Home Loan Mortgage Corporation Pool	[2],[3],[4]
Rate	4.50%	[2],[3],[4]
Maturity	2043-09	[2],[3],[4]
Fair Value	3,324	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,181 Federal National Mortgage Association Pool, 3.00% 2028-07 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	3,181	[2],[3],[4]
Description	Federal National Mortgage Association Pool	[2],[3],[4]
Rate	3.00%	[2],[3],[4]
Maturity	2028-07	[2],[3],[4]
Fair Value	3,299	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,342 Federal Home Loan Mortgage Corporation Pool, 3.00% 2043-04 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	3,342	[2],[3],[4]
Description	Federal Home Loan Mortgage Corporation Pool	[2],[3],[4]
Rate	3.00%	[2],[3],[4]
Maturity	2043-04	[2],[3],[4]
Fair Value	3,257	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,015 Federal National Mortgage Association Pool, 4.00% 2043-08 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	3,015	[2],[3],[4]
Description	Federal National Mortgage Association Pool	[2],[3],[4]
Rate	4.00%	[2],[3],[4]
Maturity	2043-08	[2],[3],[4]
Fair Value	3,165	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | Other Federal National Mortgage Association Pools [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	112,885	[2],[3],[4]	69,330	[2],[5],[6]
Description	Other Federal National Mortgage Association Pools	[2],[3],[4]	Other Federal National Mortgage Association Pools	[2],[5],[6]
Fair Value	118,649	[2],[3],[4]	74,508	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | Other Federal National Mortgage Association Pools [Member] | Minimum [Member]
Schedule of Investments [Line Items]
Rate	3.00%	[2],[3],[4]	2.50%	[2],[5],[6]
Maturity	2028-06	[2],[3],[4]	2026-03	[2],[5],[6]
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]	6.00%	[2],[5],[6]
Maturity	2043-10	[2],[3],[4]	2043-01	[2],[5],[6]
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	87,522	[2],[3],[4]	19,340	[2],[5],[6]
Description	Other Federal Home Loan Mortgage Corporation Pools	[2],[3],[4]	Other Federal Home Loan Mortgage Corporation Pools	[2],[5],[6]
Fair Value	90,161	[2],[3],[4]	20,744	[2],[5],[6]
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]	3.50%	[2],[5],[6]
Maturity	2027-12	[2],[3],[4]	2026-04	[2],[5],[6]
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]	6.00%	[2],[5],[6]
Maturity	2043-10	[2],[3],[4]	2042-12	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | Other Government National Mortgage Association Pools [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	10,942	[2],[3],[4]
Description	Other Government National Mortgage Association Pools	[2],[3],[4]
Fair Value	12,041	[2],[3],[4]
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]
Maturity	2061-11	[2],[3],[4]
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]
Maturity	2062-11	[2],[3],[4]
Principal And Interest - Fixed Rate Agency Securities [Member] | 49,427 Federal National Mortgage Association Pool, 3.50% 2042-12 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			49,427	[2],[5],[6]
Description			Federal National Mortgage Association Pool	[2],[5],[6]
Rate			3.50%	[2],[5],[6]
Maturity			2042-12	[2],[5],[6]
Fair Value			52,864	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 45,304 Federal Home Loan Mortgage Corporation Pool 3.50% 2042-11 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			45,304	[2],[5],[6]
Description			Federal Home Loan Mortgage Corporation Pool	[2],[5],[6]
Rate			3.50%	[2],[5],[6]
Maturity			2042-11	[2],[5],[6]
Fair Value			48,596	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 35,601 Federal National Mortgage Association Pool 5.00% 2037-07 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			35,601	[2],[5],[6]
Description			Federal National Mortgage Association Pool	[2],[5],[6]
Rate			5.00%	[2],[5],[6]
Maturity			2037-07	[2],[5],[6]
Fair Value			38,657	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 21,338 Federal National Mortgage Association Pool 4.50% 2041-12 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			21,338	[2],[5],[6]
Description			Federal National Mortgage Association Pool	[2],[5],[6]
Rate			4.50%	[2],[5],[6]
Maturity			2041-12	[2],[5],[6]
Fair Value			23,268	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 18,227 Federal National Mortgage Association Pool 3.50% 2042-08 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			18,227	[2],[5],[6]
Description			Federal National Mortgage Association Pool	[2],[5],[6]
Rate			3.50%	[2],[5],[6]
Maturity			2042-08	[2],[5],[6]
Fair Value			19,552	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 17,845 Federal National Mortgage Association Pool 4.50% 2041-09 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			17,845	[2],[5],[6]
Description			Federal National Mortgage Association Pool	[2],[5],[6]
Rate			4.50%	[2],[5],[6]
Maturity			2041-09	[2],[5],[6]
Fair Value			19,459	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 17,634 Federal Home Loan Mortgage Corporation Pool 5.00% 2041-07 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			17,634	[2],[5],[6]
Description			Federal Home Loan Mortgage Corporation Pool	[2],[5],[6]
Rate			5.00%	[2],[5],[6]
Maturity			2041-07	[2],[5],[6]
Fair Value			19,218	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 17,621 Federal National Mortgage Association Pool 5.00% 2041-08 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			17,621	[2],[5],[6]
Description			Federal National Mortgage Association Pool	[2],[5],[6]
Rate			5.00%	[2],[5],[6]
Maturity			2041-08	[2],[5],[6]
Fair Value			19,201	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 17,113 Federal National Mortgage Association Pool 4.50% 2041-10 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			17,113	[2],[5],[6]
Description			Federal National Mortgage Association Pool	[2],[5],[6]
Rate			4.50%	[2],[5],[6]
Maturity			2041-10	[2],[5],[6]
Fair Value			18,661	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 15,869 Federal National Mortgage Association Pool 5.00% 2041-03 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			15,869	[2],[5],[6]
Description			Federal National Mortgage Association Pool	[2],[5],[6]
Rate			5.00%	[2],[5],[6]
Maturity			2041-03	[2],[5],[6]
Fair Value			17,430	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 14,911 Federal National Mortgage Association Pool 3.00% 2042-10 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			14,911	[2],[5],[6]
Description			Federal National Mortgage Association Pool	[2],[5],[6]
Rate			3.00%	[2],[5],[6]
Maturity			2042-10	[2],[5],[6]
Fair Value			15,642	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 14,242 Federal National Mortgage Association Pool 4.00% 2042-08 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			14,242	[2],[5],[6]
Description			Federal National Mortgage Association Pool	[2],[5],[6]
Rate			4.00%	[2],[5],[6]
Maturity			2042-08	[2],[5],[6]
Fair Value			15,407	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 13,519 Federal Home Loan Mortgage Corporation Pool 3.00% 2042-10 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			13,519	[2],[5],[6]
Description			Federal Home Loan Mortgage Corporation Pool	[2],[5],[6]
Rate			3.00%	[2],[5],[6]
Maturity			2042-10	[2],[5],[6]
Fair Value			14,157	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 11,985 Federal National Mortgage Association Pool 4.50% 2041-09 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			11,985	[2],[5],[6]
Description			Federal National Mortgage Association Pool	[2],[5],[6]
Rate			4.50%	[2],[5],[6]
Maturity			2041-09	[2],[5],[6]
Fair Value			12,994	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 11,942 Federal National Mortgage Association Pool 4.00% 2041-11 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			11,942	[2],[5],[6]
Description			Federal National Mortgage Association Pool	[2],[5],[6]
Rate			4.00%	[2],[5],[6]
Maturity			2041-11	[2],[5],[6]
Fair Value			12,848	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 11,003 Federal National Mortgage Association Pool 5.00% 2041-07 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			11,003	[2],[5],[6]
Description			Federal National Mortgage Association Pool	[2],[5],[6]
Rate			5.00%	[2],[5],[6]
Maturity			2041-07	[2],[5],[6]
Fair Value			12,058	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 10,576 Federal National Mortgage Association Pool 4.00% 2042-01 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			10,576	[2],[5],[6]
Description			Federal National Mortgage Association Pool	[2],[5],[6]
Rate			4.00%	[2],[5],[6]
Maturity			2042-01	[2],[5],[6]
Fair Value			11,355	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 9,576 Federal National Mortgage Association Pool 4.50% 2026-04 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			9,576	[2],[5],[6]
Description			Federal National Mortgage Association Pool	[2],[5],[6]
Rate			4.50%	[2],[5],[6]
Maturity			2026-04	[2],[5],[6]
Fair Value			10,338	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 9,002 Federal Home Loan Mortgage Corporation Pool 4.50% 2041-10 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			9,002	[2],[5],[6]
Description			Federal Home Loan Mortgage Corporation Pool	[2],[5],[6]
Rate			4.50%	[2],[5],[6]
Maturity			2041-10	[2],[5],[6]
Fair Value			9,772	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 8,321 Federal Home Loan Mortgage Corporation Pool 4.50% 2041-02 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			8,321	[2],[5],[6]
Description			Federal Home Loan Mortgage Corporation Pool	[2],[5],[6]
Rate			4.50%	[2],[5],[6]
Maturity			2041-02	[2],[5],[6]
Fair Value			9,038	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 7,395 Federal National Mortgage Association Pool 5.50% 2039-10 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			7,395	[2],[5],[6]
Description			Federal National Mortgage Association Pool	[2],[5],[6]
Rate			5.50%	[2],[5],[6]
Maturity			2039-10	[2],[5],[6]
Fair Value			8,075	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 7,428 Eight Federal National Mortgage Association Pool 3.50% 2042-10 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			7,428	[2],[5],[6]
Description			Federal National Mortgage Association Pool	[2],[5],[6]
Rate			3.50%	[2],[5],[6]
Maturity			2042-10	[2],[5],[6]
Fair Value			7,984	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 7,352 Federal National Mortgage Association Pool 4.00% 2026-07 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			7,352	[2],[5],[6]
Description			Federal National Mortgage Association Pool	[2],[5],[6]
Rate			4.00%	[2],[5],[6]
Maturity			2026-07	[2],[5],[6]
Fair Value			7,888	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 6,324 Federal National Mortgage Association Pool 5.00% 2041-06 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			6,324	[2],[5],[6]
Description			Federal National Mortgage Association Pool	[2],[5],[6]
Rate			5.00%	[2],[5],[6]
Maturity			2041-06	[2],[5],[6]
Fair Value			6,891	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 5,929 Federal National Mortgage Association Pool 3.50% 2042-05 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			5,929	[2],[5],[6]
Description			Federal National Mortgage Association Pool	[2],[5],[6]
Rate			3.50%	[2],[5],[6]
Maturity			2042-05	[2],[5],[6]
Fair Value			6,356	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 5,689 Federal Home Loan Mortgage Corporation Pool 4.00% 2042-05 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			5,689	[2],[5],[6]
Description			Federal Home Loan Mortgage Corporation Pool	[2],[5],[6]
Rate			4.00%	[2],[5],[6]
Maturity			2042-05	[2],[5],[6]
Fair Value			6,141	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 5,592 Federal National Mortgage Association Pool 4.00% 2041-10 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			5,592	[2],[5],[6]
Description			Federal National Mortgage Association Pool	[2],[5],[6]
Rate			4.00%	[2],[5],[6]
Maturity			2041-10	[2],[5],[6]
Fair Value			6,079	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 5,642 Federal National Mortgage Association Pool 3.50% 2042-11 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			5,642	[2],[5],[6]
Description			Federal National Mortgage Association Pool	[2],[5],[6]
Rate			3.50%	[2],[5],[6]
Maturity			2042-11	[2],[5],[6]
Fair Value			6,020	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 5,494 Federal National Association Pool 3.50% 2042-08 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			5,494	[2],[5],[6]
Description			Federal National Mortgage Association Pool	[2],[5],[6]
Rate			3.50%	[2],[5],[6]
Maturity			2042-08	[2],[5],[6]
Fair Value			5,862	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 5,085 Federal National Mortgage Association Pool 5.00% 2041-10 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			5,085	[2],[5],[6]
Description			Federal National Mortgage Association Pool	[2],[5],[6]
Rate			5.00%	[2],[5],[6]
Maturity			2041-10	[2],[5],[6]
Fair Value			5,534	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 5,085 Federal National Mortgage Association Pool 4.00% 2042-04 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			5,085	[2],[5],[6]
Description			Federal National Mortgage Association Pool	[2],[5],[6]
Rate			4.00%	[2],[5],[6]
Maturity			2042-04	[2],[5],[6]
Fair Value			5,531	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 5,045 Federal National Mortgage Association Pool 5.00% 2040-11 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			5,045	[2],[5],[6]
Description			Federal National Mortgage Association Pool	[2],[5],[6]
Rate			5.00%	[2],[5],[6]
Maturity			2040-11	[2],[5],[6]
Fair Value			5,497	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 5,025 Federal National Mortgage Association Pool 5.00% 2041-07 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			5,025	[2],[5],[6]
Description			Federal National Mortgage Association Pool	[2],[5],[6]
Rate			5.00%	[2],[5],[6]
Maturity			2041-07	[2],[5],[6]
Fair Value			5,444	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,944 Federal National Mortgage Association Pool 4.50% 2041-08 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			4,944	[2],[5],[6]
Description			Federal National Mortgage Association Pool	[2],[5],[6]
Rate			4.50%	[2],[5],[6]
Maturity			2041-08	[2],[5],[6]
Fair Value			5,361	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,911 Federal Home Loan Mortgage Corporation Pool 3.50% 2042-09 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			4,911	[2],[5],[6]
Description			Federal Home Loan Mortgage Corporation Pool	[2],[5],[6]
Rate			3.50%	[2],[5],[6]
Maturity			2042-09	[2],[5],[6]
Fair Value			5,242	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,676 Federal National Mortgage Association Pool 4.00% 2042-09 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			4,676	[2],[5],[6]
Description			Federal National Mortgage Association Pool	[2],[5],[6]
Rate			4.00%	[2],[5],[6]
Maturity			2042-09	[2],[5],[6]
Fair Value			5,059	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,725 Federal National Mortgage Association Pool 3.50% 2042-07 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			4,725	[2],[5],[6]
Description			Federal National Mortgage Association Pool	[2],[5],[6]
Rate			3.50%	[2],[5],[6]
Maturity			2042-07	[2],[5],[6]
Fair Value			5,042	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,699 Federal National Mortgage Association Pool 4.00% 2026-06 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			4,699	[2],[5],[6]
Description			Federal National Mortgage Association Pool	[2],[5],[6]
Rate			4.00%	[2],[5],[6]
Maturity			2026-06	[2],[5],[6]
Fair Value			5,041	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,513 Federal National Mortgage Association Pool 3.50% 2042-11 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			4,513	[2],[5],[6]
Description			Federal National Mortgage Association Pool	[2],[5],[6]
Rate			3.50%	[2],[5],[6]
Maturity			2042-11	[2],[5],[6]
Fair Value			4,828	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,465 Federal Home Loan Mortgage Corporation Pool 4.00% 2042-02 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			4,465	[2],[5],[6]
Description			Federal Home Loan Mortgage Corporation Pool	[2],[5],[6]
Rate			4.00%	[2],[5],[6]
Maturity			2042-02	[2],[5],[6]
Fair Value			4,787	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,456 Federal National Mortgage Association Pool 3.00% 2027-07 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			4,456	[2],[5],[6]
Description			Federal National Mortgage Association Pool	[2],[5],[6]
Rate			3.00%	[2],[5],[6]
Maturity			2027-07	[2],[5],[6]
Fair Value			4,710	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,261 Federal National Mortgage Association Pool 3.50% 2042-11 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			4,261	[2],[5],[6]
Description			Federal National Mortgage Association Pool	[2],[5],[6]
Rate			3.50%	[2],[5],[6]
Maturity			2042-11	[2],[5],[6]
Fair Value			4,573	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,009 Federal Home Loan Mortgage Corporation Pool 4.00% 2041-11 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			4,009	[2],[5],[6]
Description			Federal Home Loan Mortgage Corporation Pool	[2],[5],[6]
Rate			4.00%	[2],[5],[6]
Maturity			2041-11	[2],[5],[6]
Fair Value			4,303	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,964 Federal Home Loan Mortgage Corporation Pool 3.50% 2042-11 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			3,964	[2],[5],[6]
Description			Federal Home Loan Mortgage Corporation Pool	[2],[5],[6]
Rate			3.50%	[2],[5],[6]
Maturity			2042-11	[2],[5],[6]
Fair Value			4,229	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,926 Federal National Mortgage Association Pool 3.50% 2042-08 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			3,926	[2],[5],[6]
Description			Federal National Mortgage Association Pool	[2],[5],[6]
Rate			3.50%	[2],[5],[6]
Maturity			2042-08	[2],[5],[6]
Fair Value			4,189	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,798 Federal National Mortgage Association Pool 5.00% 2035-10 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			3,798	[2],[5],[6]
Description			Federal National Mortgage Association Pool	[2],[5],[6]
Rate			5.00%	[2],[5],[6]
Maturity			2035-10	[2],[5],[6]
Fair Value			4,172	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,864 Federal Home Loan Mortgage Corporation Pool 3.50% 2042-10 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			3,864	[2],[5],[6]
Description			Federal Home Loan Mortgage Corporation Pool	[2],[5],[6]
Rate			3.50%	[2],[5],[6]
Maturity			2042-10	[2],[5],[6]
Fair Value			4,116	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,728 Federal National Mortgage Association Pool 5.00% 2040-06 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			3,728	[2],[5],[6]
Description			Federal National Mortgage Association Pool	[2],[5],[6]
Rate			5.00%	[2],[5],[6]
Maturity			2040-06	[2],[5],[6]
Fair Value			4,062	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,726 Federal National Mortgage Association Pool 4.50% 2041-12 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			3,726	[2],[5],[6]
Description			Federal National Mortgage Association Pool	[2],[5],[6]
Rate			4.50%	[2],[5],[6]
Maturity			2041-12	[2],[5],[6]
Fair Value			4,040	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,763 Federal National Mortgage Association Pool 3.50% 2027-06 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			3,763	[2],[5],[6]
Description			Federal National Mortgage Association Pool	[2],[5],[6]
Rate			3.50%	[2],[5],[6]
Maturity			2027-06	[2],[5],[6]
Fair Value			4,022	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,766 Federal National Mortgage Association Pool 3.00% 2027-08 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			3,766	[2],[5],[6]
Description			Federal National Mortgage Association Pool	[2],[5],[6]
Rate			3.00%	[2],[5],[6]
Maturity			2027-08	[2],[5],[6]
Fair Value			3,980	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,606 Federal National Mortgage Association Pool 4.50% 2042-04 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			3,606	[2],[5],[6]
Description			Federal National Mortgage Association Pool	[2],[5],[6]
Rate			4.50%	[2],[5],[6]
Maturity			2042-04	[2],[5],[6]
Fair Value			3,941	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,526 Federal Home Loan Mortgage Corporation Pool 6.00% 2039-04 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			3,526	[2],[5],[6]
Description			Federal Home Loan Mortgage Corporation Pool	[2],[5],[6]
Rate			6.00%	[2],[5],[6]
Maturity			2039-04	[2],[5],[6]
Fair Value			3,848	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,534 Federal National Mortgage Association Pool 3.50% 2042-12 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			3,534	[2],[5],[6]
Description			Federal National Mortgage Association Pool	[2],[5],[6]
Rate			3.50%	[2],[5],[6]
Maturity			2042-12	[2],[5],[6]
Fair Value			3,770	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,442 Federal Home Loan Mortgage Corporation Pool 4.50% 2041-09 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			3,442	[2],[5],[6]
Description			Federal Home Loan Mortgage Corporation Pool	[2],[5],[6]
Rate			4.50%	[2],[5],[6]
Maturity			2041-09	[2],[5],[6]
Fair Value			3,737	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,483 Federal Home Loan Mortgage Corporation Pool 3.50% 2042-11 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			3,483	[2],[5],[6]
Description			Federal Home Loan Mortgage Corporation Pool	[2],[5],[6]
Rate			3.50%	[2],[5],[6]
Maturity			2042-11	[2],[5],[6]
Fair Value			3,712	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,419 Federal National Mortgage Association Pool 4.00% 2042-04 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			3,419	[2],[5],[6]
Description			Federal National Mortgage Association Pool	[2],[5],[6]
Rate			4.00%	[2],[5],[6]
Maturity			2042-04	[2],[5],[6]
Fair Value			3,706	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,404 Federal Home Loan Mortgage Corporation Pool 4.00% 2042-01 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			3,404	[2],[5],[6]
Description			Federal Home Loan Mortgage Corporation Pool	[2],[5],[6]
Rate			4.00%	[2],[5],[6]
Maturity			2042-01	[2],[5],[6]
Fair Value			3,653	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,344 Federal National Mortgage Association Pool 4.00% 2042-09 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			3,344	[2],[5],[6]
Description			Federal National Mortgage Association Pool	[2],[5],[6]
Rate			4.00%	[2],[5],[6]
Maturity			2042-09	[2],[5],[6]
Fair Value			3,618	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,415 Federal Home Loan Mortgage Corporation Pool 3.00% 2042-11 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			3,415	[2],[5],[6]
Description			Federal Home Loan Mortgage Corporation Pool	[2],[5],[6]
Rate			3.00%	[2],[5],[6]
Maturity			2042-11	[2],[5],[6]
Fair Value			3,573	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,288 Federal Home Loan Mortgage Corporation Pool 3.50% 2042-02 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			3,288	[2],[5],[6]
Description			Federal Home Loan Mortgage Corporation Pool	[2],[5],[6]
Rate			3.50%	[2],[5],[6]
Maturity			2042-02	[2],[5],[6]
Fair Value			3,518	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,182 Federal National Mortgage Association Pool 4.00% 2042-08 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			3,182	[2],[5],[6]
Description			Federal National Mortgage Association Pool	[2],[5],[6]
Rate			4.00%	[2],[5],[6]
Maturity			2042-08	[2],[5],[6]
Fair Value			3,440	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,095 Federal National Mortgage Association Pool 4.50% 2041-11 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			3,095	[2],[5],[6]
Description			Federal National Mortgage Association Pool	[2],[5],[6]
Rate			4.50%	[2],[5],[6]
Maturity			2041-11	[2],[5],[6]
Fair Value			3,355	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,053 Federal National Mortgage Association Pool 3.50% 2042-11 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			3,053	[2],[5],[6]
Description			Federal National Mortgage Association Pool	[2],[5],[6]
Rate			3.50%	[2],[5],[6]
Maturity			2042-11	[2],[5],[6]
Fair Value			3,262	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 2,931 Federal National Mortgage Association Pool 4.00% 2042-08 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			2,931	[2],[5],[6]
Description			Federal National Mortgage Association Pool	[2],[5],[6]
Rate			4.00%	[2],[5],[6]
Maturity			2042-08	[2],[5],[6]
Fair Value			3,178	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 2,947 Federal National Mortgage Association Pool 3.50% 2027-07 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			2,947	[2],[5],[6]
Description			Federal National Mortgage Association Pool	[2],[5],[6]
Rate			3.50%	[2],[5],[6]
Maturity			2027-07	[2],[5],[6]
Fair Value			3,145	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 2,921 Federal National Mortgage Association Pool 3.50% 2027-06 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			2,921	[2],[5],[6]
Description			Federal National Mortgage Association Pool	[2],[5],[6]
Rate			3.50%	[2],[5],[6]
Maturity			2027-06	[2],[5],[6]
Fair Value			3,123	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 2,828 Federal National Mortgage Association Pool 4.50% 2041-10 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			2,828	[2],[5],[6]
Description			Federal National Mortgage Association Pool	[2],[5],[6]
Rate			4.50%	[2],[5],[6]
Maturity			2041-10	[2],[5],[6]
Fair Value			3,076	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 2,605 Government National Mortgage Association 4.55% 2062-10 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			2,605	[2],[5],[6]
Description			Government National Mortgage Association	[2],[5],[6]
Rate			4.55%	[2],[5],[6]
Maturity			2062-10	[2],[5],[6]
Fair Value			2,977	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 2,676 Federal National Mortgage Association Pool 4.50% 2041-10 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			2,676	[2],[5],[6]
Description			Federal National Mortgage Association Pool	[2],[5],[6]
Rate			4.50%	[2],[5],[6]
Maturity			2041-10	[2],[5],[6]
Fair Value			2,901	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 2,566 Federal National Mortgage Association Pool 4.00% 2042-08 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			2,566	[2],[5],[6]
Description			Federal National Mortgage Association Pool	[2],[5],[6]
Rate			4.00%	[2],[5],[6]
Maturity			2042-08	[2],[5],[6]
Fair Value			2,774	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 2,490 Federal National Mortgage Association Pool 4.50% 2042-08 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			2,490	[2],[5],[6]
Description			Federal National Mortgage Association Pool	[2],[5],[6]
Rate			4.50%	[2],[5],[6]
Maturity			2042-08	[2],[5],[6]
Fair Value			2,719	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 2,497 Federal National Mortgage Association Pool 4.00% 2042-09 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			2,497	[2],[5],[6]
Description			Federal National Mortgage Association Pool	[2],[5],[6]
Rate			4.00%	[2],[5],[6]
Maturity			2042-09	[2],[5],[6]
Fair Value			2,699	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 2,519 Federal National Mortgage Association Pool 3.50% 2042-11 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			2,519	[2],[5],[6]
Description			Federal National Mortgage Association Pool	[2],[5],[6]
Rate			3.50%	[2],[5],[6]
Maturity			2042-11	[2],[5],[6]
Fair Value			2,690	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 2,520 Federal Home Loan Mortgage Corporation Pool 3.50% 2042-11 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			2,520	[2],[5],[6]
Description			Federal Home Loan Mortgage Corporation Pool	[2],[5],[6]
Rate			3.50%	[2],[5],[6]
Maturity			2042-11	[2],[5],[6]
Fair Value			2,685	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 2,498 Federal National Mortgage Association Pool 3.50% 2042-08 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			2,498	[2],[5],[6]
Description			Federal National Mortgage Association Pool	[2],[5],[6]
Rate			3.50%	[2],[5],[6]
Maturity			2042-08	[2],[5],[6]
Fair Value			2,679	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 2,500 Federal Home Loan Mortgage Corporation Pool 3.50% 2042-01 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			2,500	[2],[5],[6]
Description			Federal Home Loan Mortgage Corporation Pool	[2],[5],[6]
Rate			3.50%	[2],[5],[6]
Maturity			2042-01	[2],[5],[6]
Fair Value			2,667	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 2,452 Federal National Mortgage Association Pool 3.50% 2042-11 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			2,452	[2],[5],[6]
Description			Federal National Mortgage Association Pool	[2],[5],[6]
Rate			3.50%	[2],[5],[6]
Maturity			2042-11	[2],[5],[6]
Fair Value			2,619	[2],[5],[6]
Principal And Interest - Fixed Rate Agency Securities [Member] | 2,377 Federal National Mortgage Association Pool 4.00% 2042-06 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			2,377	[2],[5],[6]
Description			Federal National Mortgage Association Pool	[2],[5],[6]
Rate			4.00%	[2],[5],[6]
Maturity			2042-06	[2],[5],[6]
Fair Value			2,564	[2],[5],[6]
Interest Only - Fixed Rate Agency Securities [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of net assets	2.24%	[1],[2],[3],[4]	0.64%	[1],[2],[5],[6]
Fair Value	14,099	[2],[3],[4]	3,250	[2],[5],[6]
Interest Only - Fixed Rate Agency Securities [Member] | Other Federal National Mortgage Association [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	62,344	[2],[3],[4]	20,095	[2],[5],[6]
Description	Other Federal National Mortgage Association	[2],[3],[4]	Other Federal National Mortgage Association	[2],[5],[6]
Fair Value	7,587	[2],[3],[4]	1,920	[2],[5],[6]
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]	4.00%	[2],[5],[6]
Maturity	2020-12	[2],[3],[4]	2036-01	[2],[5],[6]
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]	5.50%	[2],[5],[6]
Maturity	2043-04	[2],[3],[4]	2040-10	[2],[5],[6]
Interest Only - Fixed Rate Agency Securities [Member] | Other Federal Home Loan Mortgage Corporation [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	22,795	[2],[3],[4]	10,426	[2],[5],[6]
Description	Other Federal Home Loan Mortgage Corporation	[2],[3],[4]	Other Federal Home Loan Mortgage Corporation	[2],[5],[6]
Fair Value	3,446	[2],[3],[4]	1,195	[2],[5],[6]
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]	5.00%	[2],[5],[6]
Maturity	2032-12	[2],[3],[4]	2033-06	[2],[5],[6]
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]	5.50%	[2],[5],[6]
Maturity	2043-01	[2],[3],[4]	2039-01	[2],[5],[6]
Interest Only - Fixed Rate Agency Securities [Member] | Other Government National Mortgage Association [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	21,374	[2],[3],[4]	4,269	[2],[5],[6]
Description	Other Government National Mortgage Association	[2],[3],[4]	Other Government National Mortgage Association	[2],[5],[6]
Rate			5.50%	[2],[5],[6]
Maturity			2036-03	[2],[5],[6]
Fair Value	3,066	[2],[3],[4]	135	[2],[5],[6]
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]
Maturity	2036-03	[2],[3],[4]
Interest Only - Fixed Rate Agency Securities [Member] | Other Government National Mortgage Association [Member] | Maximum [Member]
Schedule of Investments [Line Items]
Rate	5.50%	[2],[3],[4]
Maturity	2042-11	[2],[3],[4]
TBA - Fixed Rate Agency Securities [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of net assets	19.55%	[1],[2],[3],[4]	8.61%	[1],[2],[5],[6]
Fair Value	123,131	[2],[3],[4]	43,610	[2],[5],[6]
TBA - Fixed Rate Agency Securities [Member] | 81,800 Federal Home Loan Mortgage Corporation (30 Year) 3.00% 2013-10 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	81,800	[2],[3],[4]
Description	Federal Home Loan Mortgage Corporation (30 Year)	[2],[3],[4]
Rate	3.00%	[2],[3],[4]
Maturity	2013-10	[2],[3],[4]
Fair Value	79,640	[2],[3],[4]
TBA - Fixed Rate Agency Securities [Member] | 40,700 Federal National Mortgage Association (30 Year) 3.00% 2013-11 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	40,700	[2],[3],[4]
Description	Federal National Mortgage Association (30 Year)	[2],[3],[4]
Rate	3.00%	[2],[3],[4]
Maturity	2013-11	[2],[3],[4]
Fair Value	39,659	[2],[3],[4]
TBA - Fixed Rate Agency Securities [Member] | 3,600 Other Federal Home Loan Mortgage Corporation (30 Year) 4.50% 2013-10 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	3,600	[2],[3],[4]
Description	Other Federal Home Loan Mortgage Corporation (30 Year)	[2],[3],[4]
Rate	4.50%	[2],[3],[4]
Maturity	2013-10	[2],[3],[4]
Fair Value	3,832	[2],[3],[4]
TBA - Fixed Rate Agency Securities [Member] | 18,950 Federal Home Loan Mortgage Corporation (30 Years) 4.00% 2013-01 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			18,950	[2],[5],[6]
Description			Federal Home Loan Mortgage Corporation (30 Year)	[2],[5],[6]
Rate			4.00%	[2],[5],[6]
Maturity			2013-01	[2],[5],[6]
Fair Value			20,232	[2],[5],[6]
TBA - Fixed Rate Agency Securities [Member] | 16,600 Federal National Mortgage Association (15 Years) 3.00% 2013-01 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			16,600	[2],[5],[6]
Description			Federal National Mortgage Association (15 Year)	[2],[5],[6]
Rate			3.00%	[2],[5],[6]
Maturity			2013-01	[2],[5],[6]
Fair Value			17,523	[2],[5],[6]
TBA - Fixed Rate Agency Securities [Member] | 5,600 Federal Home Loan Mortgage Corporation (30 Years) 3.00% 2013-01 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			5,600	[2],[5],[6]
Description			Federal Home Loan Mortgage Corporation (30 Year)	[2],[5],[6]
Rate			3.00%	[2],[5],[6]
Maturity			2013-01	[2],[5],[6]
Fair Value			5,855	[2],[5],[6]
Fixed Rate Agency Securities [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of net assets	166.06%	[1],[2],[3],[4]	157.46%	[1],[2],[5],[6]
Fair Value	1,045,817	[2],[3],[4]	797,314	[2],[5],[6]
Investment Owned, at Cost	1,053,939	[2],[3],[4]	789,964	[2],[5],[6]
Principal And Interest - Floating Rate Agency Securities [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of net assets	5.96%	[1],[2],[3],[4]	3.39%	[1],[2],[5],[6]
Fair Value	37,556	[2],[3],[4]	17,169	[2],[5],[6]
Principal And Interest - Floating Rate Agency Securities [Member] | Other Federal National Mortgage Association Pools [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	3,903	[2],[3],[4]	3,159	[2],[5],[6]
Description	Other Federal National Mortgage Association Pools	[2],[3],[4]	Other Federal National Mortgage Association Pools	[2],[5],[6]
Fair Value	4,135	[2],[3],[4]	3,385	[2],[5],[6]
Principal And Interest - Floating Rate Agency Securities [Member] | Other Federal National Mortgage Association Pools [Member] | Minimum [Member]
Schedule of Investments [Line Items]
Rate	2.69%	[2],[3],[4]	4.93%	[2],[5],[6]
Maturity	2036-04	[2],[3],[4]	2037-07	[2],[5],[6]
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]	5.50%	[2],[5],[6]
Maturity	2037-09	[2],[3],[4]	2037-09	[2],[5],[6]
Principal And Interest - Floating Rate Agency Securities [Member] | 9,091 Federal Home Loan Mortgage Corporation Pool, 2.54% 2043-08 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	9,091	[2],[3],[4]
Description	Federal Home Loan Mortgage Corporation Pool	[2],[3],[4]
Rate	2.54%	[2],[3],[4]
Maturity	2043-08	[2],[3],[4]
Fair Value	9,106	[2],[3],[4]
Principal And Interest - Floating Rate Agency Securities [Member] | 6,979 Federal Home Loan Mortgage Corporation Pool, 4.9% 2038-04 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	6,979	[2],[3],[4]
Description	Federal Home Loan Mortgage Corporation Pool	[2],[3],[4]
Rate	4.90%	[2],[3],[4]
Maturity	2038-04	[2],[3],[4]
Fair Value	7,445	[2],[3],[4]
Principal And Interest - Floating Rate Agency Securities [Member] | 4,937 Federal National Mortgage Association Pool, 4.27% 2040-04 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	4,937	[2],[3],[4]
Description	Federal National Mortgage Association Pool	[2],[3],[4]
Rate	4.27%	[2],[3],[4]
Maturity	2040-04	[2],[3],[4]
Fair Value	5,249	[2],[3],[4]
Principal And Interest - Floating Rate Agency Securities [Member] | 3,941 Federal National Mortgage Association Pool, 5.73% 2037-07 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	3,941	[2],[3],[4]
Description	Federal National Mortgage Association Pool	[2],[3],[4]
Rate	5.73%	[2],[3],[4]
Maturity	2037-07	[2],[3],[4]
Fair Value	4,197	[2],[3],[4]
Principal And Interest - Floating Rate Agency Securities [Member] | 3,649 Federal National Mortgage Association Pool, 2.53% 2038-05 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	3,649	[2],[3],[4]
Description	Federal National Mortgage Association Pool	[2],[3],[4]
Rate	2.53%	[2],[3],[4]
Maturity	2038-05	[2],[3],[4]
Fair Value	3,844	[2],[3],[4]
Principal And Interest - Floating Rate Agency Securities [Member] | 3,396 Federal National Mortgage Association Pool, 6.08% 2037-08 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	3,396	[2],[3],[4]
Description	Federal National Mortgage Association Pool	[2],[3],[4]
Rate	6.08%	[2],[3],[4]
Maturity	2037-08	[2],[3],[4]
Fair Value	3,580	[2],[3],[4]
Principal And Interest - Floating Rate Agency Securities [Member] | 6,045 Federal National Mortgage Association Pool 5.08% 2038-05 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			6,045	[2],[5],[6]
Description			Federal National Mortgage Association Pool	[2],[5],[6]
Rate			5.08%	[2],[5],[6]
Maturity			2038-05	[2],[5],[6]
Fair Value			6,374	[2],[5],[6]
Principal And Interest - Floating Rate Agency Securities [Member] | 4,537 Federal National Mortgage Association Pool 3.14% 2035-15 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			4,537	[2],[5],[6]
Description			Federal National Mortgage Association Pool	[2],[5],[6]
Rate			3.14%	[2],[5],[6]
Maturity			2035-12	[2],[5],[6]
Fair Value			4,783	[2],[5],[6]
Principal And Interest - Floating Rate Agency Securities [Member] | 2,478 Federal National Mortgage Association Pool 5.69% 2036-04 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			2,478	[2],[5],[6]
Description			Federal National Mortgage Association Pool	[2],[5],[6]
Rate			5.69%	[2],[5],[6]
Maturity			2036-04	[2],[5],[6]
Fair Value			2,627	[2],[5],[6]
Interest Only - Floating Rate Agency Securities [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of net assets	3.64%	[1],[2],[3],[4]	0.67%	[1],[2],[5],[6]
Fair Value	22,934	[2],[3],[4]	3,394	[2],[5],[6]
Interest Only - Floating Rate Agency Securities [Member] | Other Federal National Mortgage Association [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	43,974	[2],[3],[4]	1,042	[2],[5],[6]
Description	Other Federal National Mortgage Association	[2],[3],[4]	Other Federal National Mortgage Association	[2],[5],[6]
Rate			5.50%	[2],[5],[6]
Maturity			2036-08	[2],[5],[6]
Fair Value	8,083	[2],[3],[4]	152	[2],[5],[6]
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]
Maturity	2036-08	[2],[3],[4]
Interest Only - Floating Rate Agency Securities [Member] | Other Federal National Mortgage Association [Member] | Maximum [Member]
Schedule of Investments [Line Items]
Rate	6.57%	[2],[3],[4]
Maturity	2043-07	[2],[3],[4]
Interest Only - Floating Rate Agency Securities [Member] | Other Federal Home Loan Mortgage Corporation [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	19,311	[2],[3],[4]
Description	Other Federal Home Loan Mortgage Corporation	[2],[3],[4]
Fair Value	2,368	[2],[3],[4]
Interest Only - Floating Rate Agency Securities [Member] | Other Federal Home Loan Mortgage Corporation [Member] | Minimum [Member]
Schedule of Investments [Line Items]
Rate	5.82%	[2],[3],[4]
Maturity	2038-11	[2],[3],[4]
Interest Only - Floating Rate Agency Securities [Member] | Other Federal Home Loan Mortgage Corporation [Member] | Maximum [Member]
Schedule of Investments [Line Items]
Rate	6.52%	[2],[3],[4]
Maturity	2039-08	[2],[3],[4]
Interest Only - Floating Rate Agency Securities [Member] | Other Government National Mortgage Association [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	90,958	[2],[3],[4]
Description	Other Government National Mortgage Association	[2],[3],[4]
Fair Value	9,776	[2],[3],[4]
Interest Only - Floating Rate Agency Securities [Member] | Other Government National Mortgage Association [Member] | Minimum [Member]
Schedule of Investments [Line Items]
Rate	1.63%	[2],[3],[4]
Maturity	2042-11	[2],[3],[4]
Interest Only - Floating Rate Agency Securities [Member] | Other Government National Mortgage Association [Member] | Maximum [Member]
Schedule of Investments [Line Items]
Rate	6.57%	[2],[3],[4]
Maturity	2063-08	[2],[3],[4]
Interest Only - Floating Rate Agency Securities [Member] | Resecuritization of Government National Mortgage Association [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	22,948	[2],[3],[4],[7]	23,140	[2],[5],[6],[7]
Description	Resecuritization of Government National Mortgage Association (q)	[2],[3],[4],[7]	Resecuritization of Government National Mortgage Association (o)	[2],[5],[6],[7]
Rate	4.32%	[2],[3],[4],[7]	4.28%	[2],[5],[6],[7]
Maturity	2060-08	[2],[3],[4],[7]	2060-08	[2],[5],[6],[7]
Fair Value	2,707	[2],[3],[4],[7]	3,242	[2],[5],[6],[7]
Floating Rate Agency Securities [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of net assets	9.60%	[1],[2],[3],[4]	4.06%	[1],[2],[5],[6]
Fair Value	60,490	[2],[3],[4]	20,563	[2],[5],[6]
Investment Owned, at Cost	60,155	[2],[3],[4]	19,979	[2],[5],[6]
Agency Securities [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of net assets	175.66%	[1],[2],[3],[4]	161.52%	[1],[2],[5],[6]
Fair Value	1,106,307	[2],[3],[4]	817,877	[2],[5],[6]
Investment Owned, at Cost	1,114,094	[2],[3],[4]	809,943	[2],[5],[6]
Principal And Interest - Private Label Securities [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of net assets	108.17%	[1],[2],[3]	107.47%	[1],[2],[5]
Fair Value	681,278	[2],[3]	544,208	[2],[5]
Investment Owned, at Cost	628,805	[2],[3]	505,380	[2],[5]
Principal And Interest - Private Label Securities [Member] | Various Issuer [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	997,533	[2],[3]	850,320	[2],[5]
Description	Various	[2],[3]	Various	[2],[5]
Fair Value	681,278	[2],[3]	544,208	[2],[5]
Principal And Interest - Private Label Securities [Member] | Various Issuer [Member] | Minimum [Member]
Schedule of Investments [Line Items]
Rate	0.27%	[2],[3]	0.17%	[2],[5]
Maturity	2019-05	[2],[3]	2019-05	[2],[5]
Principal And Interest - Private Label Securities [Member] | Various Issuer [Member] | Maximum [Member]
Schedule of Investments [Line Items]
Rate	9.35%	[2],[3]	9.35%	[2],[5]
Maturity	2050-06	[2],[3]	2047-05	[2],[5]
Principal Only - Private Label Securities [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of net assets	0.42%	[1],[2],[3]	0.46%	[1],[5]
Fair Value	2,668	[2],[3]	2,320	[2],[5]
Investment Owned, at Cost	2,416	[2],[3]	2,242	[2],[5]
Principal Only - Private Label Securities [Member] | Various Issuer [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	5,800	[2],[3]	5,800	[2],[5]
Description	Various	[2],[3]	Various	[2],[5]
Rate	0.00%	[2],[3]	0.00%	[2],[5]
Maturity	2030-08	[2],[3]	2030-08	[2],[5]
Fair Value	2,668	[2],[3]	2,320	[2],[5]
Interest Only - Private Label Securities [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of net assets	0.21%	[1],[2],[3]	0.23%	[1],[2],[5]
Fair Value	1,307	[2],[3]	1,165	[2],[5]
Investment Owned, at Cost	543	[2],[3]	637	[2],[5]
Interest Only - Private Label Securities [Member] | Various Issuer [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	52,880	[2],[3]	61,640	[2],[5]
Description	Various	[2],[3]	Various	[2],[5]
Fair Value	1,307	[2],[3]	1,165	[2],[5]
Interest Only - Private Label Securities [Member] | Various Issuer [Member] | Minimum [Member]
Schedule of Investments [Line Items]
Rate	0.50%	[2],[3]	0.50%	[2],[5]
Maturity	2044-06	[2],[3]	2044-06	[2],[5]
Interest Only - Private Label Securities [Member] | Various Issuer [Member] | Maximum [Member]
Schedule of Investments [Line Items]
Rate	2.00%	[2],[3]	2.00%	[2],[5]
Maturity	2047-09	[2],[3]	2047-09	[2],[5]
Other Private Label Securities [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of net assets	0.00%	[1],[2],[3]	0.00%	[1],[2],[5]
Fair Value	0	[2],[3]	0	[2],[5]
Investment Owned, at Cost	354	[2],[3]	429	[2],[5]
Other Private Label Securities [Member] | Various Issuer [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	130,742	[2],[3]	158,348	[2],[5]
Description	Various	[2],[3]	Various	[2],[5]
Rate	0.00%	[2],[3]	0.00%	[2],[5]
Maturity	2037-06	[2],[3]	2037-06	[2],[5]
Fair Value	0	[2],[3]	0	[2],[5]
Private Label Securities [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of net assets	108.80%	[1],[2],[3]	108.16%	[1],[2],[5]
Fair Value	685,253	[2],[3]	547,693	[2],[5]
Investment Owned, at Cost	632,118	[2],[3]	508,688	[2],[5]
Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of net assets	284.46%	[1],[2],[3]	269.68%	[1],[2],[5]
Fair Value	1,791,560	[2],[3]	1,365,570	[2],[5]
Investment Owned, at Cost	1,746,212	[2],[3]	1,318,631	[2],[5]
Asset-backed Securities [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of net assets	7.19%	[1],[2],[3]
Fair Value	45,255	[2],[3]
Investment Owned, at Cost	46,122	[2],[3]
Asset-backed Securities [Member] | Various Issuer [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	55,868	[2],[3]
Description	Various	[2],[3]
Fair Value	45,255	[2],[3]
Asset-backed Securities [Member] | Various Issuer [Member] | Minimum [Member]
Schedule of Investments [Line Items]
Rate	0.00%	[2],[3]
Maturity	2017-06	[2],[3]
Asset-backed Securities [Member] | Various Issuer [Member] | Maximum [Member]
Schedule of Investments [Line Items]
Rate	9.76%	[2],[3]
Maturity	2049-12	[2],[3]
Commercial Mortgage Loans [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of net assets	2.37%	[1],[2],[3],[8]	1.89%	[1],[2],[5],[9]
Fair Value	14,936	[2],[3],[8]	9,546	[2],[5],[9]
Investment Owned, at Cost	14,415	[2],[3],[8]	9,522	[2],[5],[9]
Commercial Mortgage Loans [Member] | Various Issuer [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	16,455	[2],[3],[8]	10,225	[2],[5],[9]
Description	Various	[2],[3],[8]	Various	[2],[5],[9]
Fair Value	14,936	[2],[3],[8]	9,546	[2],[5],[9]
Commercial Mortgage Loans [Member] | Various Issuer [Member] | Minimum [Member]
Schedule of Investments [Line Items]
Rate	0.00%	[2],[3]	5.00%	[2],[5],[9]
Maturity	2013-11	[2],[3]	2013-11	[2],[5],[9]
Commercial Mortgage Loans [Member] | Various Issuer [Member] | Maximum [Member]
Schedule of Investments [Line Items]
Rate	7.25%	[2],[3]	6.25%	[2],[5],[9]
Maturity	2014-09	[2],[3]	2039-05	[2],[5],[9]
Long Investments [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of net assets	294.02%	[1],[2],[3]	271.57%	[1],[2],[5]
Fair Value	1,851,751	[2],[3]	1,375,116	[2],[5]
Investment Owned, at Cost	1,806,749	[2],[3]	1,328,153	[2],[5]
Long Investments [Member] | Federal National Mortgage Association [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of net assets	104.50%		119.78%
Long Investments [Member] | Federal Home Loan Mortgage Corporation [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of net assets	59.09%		40.49%
Long Investments [Member] | Government National Mortgage Association [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of net assets	12.07%		1.25%
Commercial Mortgage Loan With Extendable Maturity [Member] | Commercial Mortgage Loans [Member] | Various Issuer [Member]
Schedule of Investments [Line Items]
Fair Value	$ 5,000		$ 4,900

[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 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 affiliated with Fannie Mae, Freddie Mac, or Ginnie Mae. 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 175.66%Aaa/AAA/AAA 0.00%Aa/AA/AA 0.00%A/A/A 0.48%Baa/BBB/BBB 2.53%Ba/BB/BB or below 110.32%Unrated 5.03%

[4] At September 30, 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 104.50%, 59.09%, and 12.07% of equity, respectively.

[5] 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 affiliated with Fannie Mae, Freddie Mac, or Ginnie Mae. 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 161.52%Aaa/AAA/AAA 0.01%Aa/AA/AA 0.26%A/A/A 1.02%Baa/BBB/BBB 3.70%Ba/BB/BB or below 102.40%Unrated 2.66%

[6] At December 31, 2012, 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 119.78%, 40.49%, and 1.25% of equity, respectively.

[7] Private trust 100% backed by interest in Government National Mortgage Association collateralized mortgage obligation certificates.

[8] 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 whole loans.

[9] Includes a loan with a fair value in the amount of $4.9 million where the maturity date may be extended through November 4, 2015 as well as a non-performing commercial whole loan.