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Trading Securities (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
Jul. 07, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Trading Securities |  |  |  |
Purchases | $ 201,095,000 | $ (201,095,000) |  |
Proceeds from sale | 190,907,000 | (190,907,000) |  |
Net realized gain | 338,000 | $ 50,000 | $ 2,711,000 | $ (655,000)
Net unrealized gains | 148,000 |  |  |
Ending balance | $ 10,674,000 |  |  |

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