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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES : Trading Securities (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items] |  |
Equity securities - cost | $ 97,220 | $ 36,851
Available-for-sale Securities, Gross Unrealized Gain | 291,797 | 74,099
Available-for-sale Securities, Gross Unrealized Loss | (1,897) | (1,847)
Equity securities at fair value | 387,120 | 109,103
Equity Securites Lf Fund Public Securities [Member] |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items] |  |
Equity securities - cost | 62,042 | 32,765
Available-for-sale Securities, Gross Unrealized Gain | 288,508 | 72,689
Available-for-sale Securities, Gross Unrealized Loss | (1,812) | (583)
Equity securities at fair value | 348,738 | 104,871
Equity Securities Other Equity [Member] |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items] |  |
Equity securities - cost | 35,178 | 4,086
Available-for-sale Securities, Gross Unrealized Gain | 3,289 | 1,410
Available-for-sale Securities, Gross Unrealized Loss | (85) | (1,264)
Equity securities at fair value | $ 38,382 | $ 4,232

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