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3. Trading Securities (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Trading securities, cost |  | $ 111,386
Gross unrealized gain | $ 74,099 | 354
Gross unrealized loss | (1,847) | (757)
Fair value of trading securities |  | 110,983
Trading securities - Equity [Member] |  |
Trading securities, cost | 36,851 | 17,674
Gross unrealized gain |  | 211
Gross unrealized loss |  | (745)
Fair value of trading securities | $ 109,103 | 17,140
Trading securities - Debt [Member] |  |
Trading securities, cost |  | 93,712
Gross unrealized gain |  | 143
Gross unrealized loss |  | (12)
Fair value of trading securities |  | $ 93,843

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