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SUBSEQUENT EVENTS (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
SUBSEQUENT EVENTS |  |  |
Available-for-sale investment securities, cost |  | $ 4,675,474 | $ 4,980,102
Subsequent event |  |  |
SUBSEQUENT EVENTS |  |  |
Available-for-sale investment securities, cost | $ 786,100 |  |
After-tax realized loss | 52,300 |  |
Proceeds from sales of available-for-sale investment securities | $ 733,800 |  |

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