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Consolidated Condensed Schedule of Investments (Repurchase Agreements) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2020
Dec. 31, 2019
Schedule of Investments [Line Items]      
Unpaid Principal Balance   $ 1,417,054 $ 1,387,733
Repurchase agreements, at fair value $ 61,274 $ 38,640 $ 73,639
Repurchase agreements, cost 61,274    
Securities Purchased under Agreements to Resell [Member]      
Schedule of Investments [Line Items]      
Repurchase agreements, at fair value 61,274    
Repurchase agreements, cost $ 61,274    
Investment Owned, Percent of Net Assets 10.30%    
JP Morgan Securities LLC Collateralized by Par Value $13,600 U.S. Treasury Note, Coupon 2.88%, Maturity Date 2021 11 [Member] | Securities Purchased under Agreements to Resell [Member]      
Schedule of Investments [Line Items]      
Unpaid Principal Balance $ 13,854    
Investment Interest Rate (3.25%)    
Repurchase agreements, at fair value $ 13,854    
Securities Collateralized By Par Value $ 13,600    
Coupon Rate On Underlying Collateral On Repurchase Agreement 2.88%    
Maturity Date Of Securities As Collateral On Repurchase Agreement1 2021-11    
Investments maturity date 2019-01    
JP Morgan Securities LLC Collateralized by Par Value $10,451 U.S. Treasury Note, Coupon 2.88%, Maturity Date 2023 10 [Member] | Securities Purchased under Agreements to Resell [Member]      
Schedule of Investments [Line Items]      
Unpaid Principal Balance $ 10,712    
Investment Interest Rate (3.15%)    
Repurchase agreements, at fair value $ 10,712    
Securities Collateralized By Par Value $ 10,451    
Coupon Rate On Underlying Collateral On Repurchase Agreement 2.88%    
Maturity Date Of Securities As Collateral On Repurchase Agreement1 2023-10    
Investments maturity date 2019-01    
JP Morgan Securities LLC Collateralized by Par Value $10,102 Sovereign Government Bond, Coupon 0.75%, Maturity Date 2021 07 [Member] | Securities Purchased under Agreements to Resell [Member]      
Schedule of Investments [Line Items]      
Unpaid Principal Balance $ 10,365    
Investment Interest Rate (0.75%)    
Repurchase agreements, at fair value $ 10,365    
Securities Collateralized By Par Value $ 10,102    
Coupon Rate On Underlying Collateral On Repurchase Agreement 0.75%    
Maturity Date Of Securities As Collateral On Repurchase Agreement1 2021-07    
Investments maturity date 2019-01    
JP Morgan Securities LLC Collateralized by Par Value $9,161 Sovereign Government Bond, Coupon 2.75%, Maturity Date 2019 04 [Member] | Securities Purchased under Agreements to Resell [Member]      
Schedule of Investments [Line Items]      
Unpaid Principal Balance $ 9,379    
Investment Interest Rate (0.65%)    
Repurchase agreements, at fair value $ 9,379    
Securities Collateralized By Par Value $ 9,161    
Coupon Rate On Underlying Collateral On Repurchase Agreement 2.75%    
Maturity Date Of Securities As Collateral On Repurchase Agreement1 2019-04    
Investments maturity date 2019-01    
JP Morgan Securities LLC Collateralized by Par Value $3,400 U.S. Treasury Note, Coupon 3.13%, Maturity Date 2028 11 [Member] | Securities Purchased under Agreements to Resell [Member]      
Schedule of Investments [Line Items]      
Unpaid Principal Balance $ 3,562    
Investment Interest Rate (3.05%)    
Repurchase agreements, at fair value $ 3,562    
Securities Collateralized By Par Value $ 3,400    
Coupon Rate On Underlying Collateral On Repurchase Agreement 3.13%    
Maturity Date Of Securities As Collateral On Repurchase Agreement1 2028-11    
Investments maturity date 2019-01    
JP Morgan Securities LLC Collateralized by Par Value $2,800 U.S. Treasury Note, Coupon 2.88%, Maturity Date 2028 08 [Member] | Securities Purchased under Agreements to Resell [Member]      
Schedule of Investments [Line Items]      
Unpaid Principal Balance $ 2,884    
Investment Interest Rate (2.95%)    
Repurchase agreements, at fair value $ 2,884    
Securities Collateralized By Par Value $ 2,800    
Coupon Rate On Underlying Collateral On Repurchase Agreement 2.88%    
Maturity Date Of Securities As Collateral On Repurchase Agreement1 2028-08    
Investments maturity date 2019-01    
Bank of America Securities Collateralized by Par Value $2,062 U.S. Treasury Note, Coupon 2.88%, Maturity Date 2023 11 [Member] | Securities Purchased under Agreements to Resell [Member]      
Schedule of Investments [Line Items]      
Unpaid Principal Balance $ 2,098    
Investment Interest Rate (2.90%)    
Repurchase agreements, at fair value $ 2,098    
Securities Collateralized By Par Value $ 2,062    
Coupon Rate On Underlying Collateral On Repurchase Agreement 2.88%    
Maturity Date Of Securities As Collateral On Repurchase Agreement1 2023-11    
Investments maturity date 2019-01    
Bank of America Securities Collateralized by Par Value $1,939 U.S. Treasury Note, Coupon 2.75%, Maturity Date 2023 08 [Member] | Securities Purchased under Agreements to Resell [Member]      
Schedule of Investments [Line Items]      
Unpaid Principal Balance $ 1,975    
Investment Interest Rate (2.90%)    
Repurchase agreements, at fair value $ 1,975    
Securities Collateralized By Par Value $ 1,939    
Coupon Rate On Underlying Collateral On Repurchase Agreement 2.75%    
Maturity Date Of Securities As Collateral On Repurchase Agreement1 2023-08    
Investments maturity date 2019-01    
Barclays Capital Inc Collateralized by Par Value $1,900 Exchange-Traded Corporate Debt, Coupon 5.95%, Maturity Date 2026 12 [Member] | Securities Purchased under Agreements to Resell [Member]      
Schedule of Investments [Line Items]      
Unpaid Principal Balance $ 1,710    
Investment Interest Rate (1.65%)    
Repurchase agreements, at fair value $ 1,710    
Securities Collateralized By Par Value $ 1,900    
Coupon Rate On Underlying Collateral On Repurchase Agreement 5.95%    
Maturity Date Of Securities As Collateral On Repurchase Agreement1 2026-12    
Investments maturity date 2019-01    
Bank of America Securities Collateralized by Par Value $1,355 U.S. Treasury Note, Coupon 2.75%, Maturity Date 2023 04 [Member] | Securities Purchased under Agreements to Resell [Member]      
Schedule of Investments [Line Items]      
Unpaid Principal Balance $ 1,369    
Investment Interest Rate (3.05%)    
Repurchase agreements, at fair value $ 1,369    
Securities Collateralized By Par Value $ 1,355    
Coupon Rate On Underlying Collateral On Repurchase Agreement 2.75%    
Maturity Date Of Securities As Collateral On Repurchase Agreement1 2023-04    
Investments maturity date 2019-01    
Morgan Stanley Collateralized by Par Value $1,000 Exchange-Traded Corporate Debt, Coupon 5.95%, Maturity Date 2026 12 [Member] | Securities Purchased under Agreements to Resell [Member]      
Schedule of Investments [Line Items]      
Unpaid Principal Balance $ 957    
Investment Interest Rate (2.15%)    
Repurchase agreements, at fair value $ 957    
Securities Collateralized By Par Value $ 1,000    
Coupon Rate On Underlying Collateral On Repurchase Agreement 5.95%    
Maturity Date Of Securities As Collateral On Repurchase Agreement1 2026-12    
Investments maturity date 2019-01    
Barclays Capital Inc Collateralized by Par Value $1,200 Exchange-Traded Corporate Debt, Coupon 9.88%, Maturity Date 2024 02 [Member] | Securities Purchased under Agreements to Resell [Member]      
Schedule of Investments [Line Items]      
Unpaid Principal Balance $ 797    
Investment Interest Rate (0.75%)    
Repurchase agreements, at fair value $ 797    
Securities Collateralized By Par Value $ 1,200    
Coupon Rate On Underlying Collateral On Repurchase Agreement 9.88%    
Maturity Date Of Securities As Collateral On Repurchase Agreement1 2024-02    
Investments maturity date 2019-01    
Barclays Capital Inc Collateralized by Par Value $800 Exchange-Traded Corporate Debt, Coupon 9.88%, Maturity Date 2024 02 [Member] | Securities Purchased under Agreements to Resell [Member]      
Schedule of Investments [Line Items]      
Unpaid Principal Balance $ 531    
Investment Interest Rate (1.25%)    
Repurchase agreements, at fair value $ 531    
Securities Collateralized By Par Value $ 800    
Coupon Rate On Underlying Collateral On Repurchase Agreement 9.88%    
Maturity Date Of Securities As Collateral On Repurchase Agreement1 2024-02    
Investments maturity date 2019-01    
RBC Capital Markets LLC Collateralized by Par Value $500 Exchange-Traded Corporate Debt, Coupon 5.75%, Maturity Date 2022 10 [Member] | Securities Purchased under Agreements to Resell [Member]      
Schedule of Investments [Line Items]      
Unpaid Principal Balance $ 525    
Investment Interest Rate (2.05%)    
Repurchase agreements, at fair value $ 525    
Securities Collateralized By Par Value $ 500    
Coupon Rate On Underlying Collateral On Repurchase Agreement 5.75%    
Maturity Date Of Securities As Collateral On Repurchase Agreement1 2022-10    
Investments maturity date 2019-01    
Bank of America Securities Collateralized by Par Value $463 U.S. Treasury Note, Coupon 2.63%, Maturity Date 2023 06 [Member] | Securities Purchased under Agreements to Resell [Member]      
Schedule of Investments [Line Items]      
Unpaid Principal Balance $ 469    
Investment Interest Rate (3.05%)    
Repurchase agreements, at fair value $ 469    
Securities Collateralized By Par Value $ 463    
Coupon Rate On Underlying Collateral On Repurchase Agreement 2.63%    
Maturity Date Of Securities As Collateral On Repurchase Agreement1 2023-06    
Investments maturity date 2019-01    
Societe Generale Collateralized by Par Value $100 Exchange-Traded Corporate Debt, Coupon 5.95%, Maturity Date 2026 12 [Member] | Securities Purchased under Agreements to Resell [Member]      
Schedule of Investments [Line Items]      
Unpaid Principal Balance $ 87    
Investment Interest Rate (1.85%)    
Repurchase agreements, at fair value $ 87    
Securities Collateralized By Par Value $ 100    
Coupon Rate On Underlying Collateral On Repurchase Agreement 5.95%    
Maturity Date Of Securities As Collateral On Repurchase Agreement1 2026-12    
Investments maturity date 2019-01