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DERIVATIVE INSTRUMENTS - Consolidated Balance Sheets and Fair Value of the Principal Derivative Instruments (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Derivative Assets |  |
Gross Amounts of Recognized Assets | $ 53,921 | $ 17,889
Gross Amounts Offset in the Balance Sheet | 0 | 0
Net Amounts of Assets Presented in the Balance Sheet | 53,921 | 17,889
Collateral Received | 0 | 0
Net Amount | 53,921 | 17,889
Derivative Liabilities |  |
Gross Amounts of Recognized Liabilities | 47,385 | 16,954
Gross Amounts Offset in the Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in the Balance Sheet | 47,385 | 16,954
Collateral Pledged | 5,779 | 1,599
Net Amount | 41,606 | 15,355
Derivative instruments not designated as hedges |  |
Derivative Assets |  |
Gross Amounts of Recognized Assets | 49,520 | 16,523
Gross Amounts Offset in the Balance Sheet | 0 | 0
Net Amounts of Assets Presented in the Balance Sheet | 49,520 | 16,523
Collateral Received | 0 | 0
Net Amount | 49,520 | 16,523
Derivative Liabilities |  |
Gross Amounts of Recognized Liabilities | 47,241 | 12,891
Gross Amounts Offset in the Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in the Balance Sheet | 47,241 | 12,891
Collateral Pledged | 5,779 | 1,599
Net Amount | 41,462 | 11,292
Derivative instruments not designated as hedges | Interest rate futures |  |
Derivative Assets |  |
Gross Amounts of Recognized Assets | 1,179 | 1,068
Gross Amounts Offset in the Balance Sheet | 0 | 0
Net Amounts of Assets Presented in the Balance Sheet | 1,179 | 1,068
Collateral Received | 0 | 0
Net Amount | 1,179 | 1,068
Derivative Liabilities |  |
Gross Amounts of Recognized Liabilities | 4,125 | 1,426
Gross Amounts Offset in the Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in the Balance Sheet | 4,125 | 1,426
Collateral Pledged | 4,125 | 1,426
Net Amount | 0 | 0
Derivative instruments not designated as hedges | Foreign currency forward contracts, underwriting and non-investment operations |  |
Derivative Assets |  |
Gross Amounts of Recognized Assets | 41,080 | 13,730
Gross Amounts Offset in the Balance Sheet | 0 | 0
Net Amounts of Assets Presented in the Balance Sheet | 41,080 | 13,730
Collateral Received | 0 | 0
Net Amount | 41,080 | 13,730
Derivative Liabilities |  |
Gross Amounts of Recognized Liabilities | 38,286 | 7,880
Gross Amounts Offset in the Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in the Balance Sheet | 38,286 | 7,880
Collateral Pledged | 0 | 0
Net Amount | 38,286 | 7,880
Derivative instruments not designated as hedges | Foreign currency forward contracts, investment operations |  |
Derivative Assets |  |
Gross Amounts of Recognized Assets | 7,255 | 1,247
Gross Amounts Offset in the Balance Sheet | 0 | 0
Net Amounts of Assets Presented in the Balance Sheet | 7,255 | 1,247
Collateral Received | 0 | 0
Net Amount | 7,255 | 1,247
Derivative Liabilities |  |
Gross Amounts of Recognized Liabilities | 3,176 | 3,412
Gross Amounts Offset in the Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in the Balance Sheet | 3,176 | 3,412
Collateral Pledged | 0 | 0
Net Amount | 3,176 | 3,412
Derivative instruments not designated as hedges | Foreign currency option contracts |  |
Derivative Assets |  |
Gross Amounts of Recognized Assets | 0 |
Gross Amounts Offset in the Balance Sheet | 0 |
Net Amounts of Assets Presented in the Balance Sheet | 0 |
Collateral Received | 0 |
Net Amount | 0 |
Derivative Liabilities |  |
Gross Amounts of Recognized Liabilities | 0 |
Gross Amounts Offset in the Balance Sheet | 0 |
Net Amounts of Liabilities Presented in the Balance Sheet | 0 |
Collateral Pledged | 0 |
Net Amount | 0 |
Derivative instruments not designated as hedges | Credit default swaps |  |
Derivative Assets |  |
Gross Amounts of Recognized Assets | 6 | 478
Gross Amounts Offset in the Balance Sheet | 0 | 0
Net Amounts of Assets Presented in the Balance Sheet | 6 | 478
Collateral Received | 0 | 0
Net Amount | 6 | 478
Derivative Liabilities |  |
Gross Amounts of Recognized Liabilities | 6 |
Gross Amounts Offset in the Balance Sheet | 0 |
Net Amounts of Liabilities Presented in the Balance Sheet | 6 |
Collateral Pledged | 6 |
Net Amount | 0 |
Derivative instruments not designated as hedges | Equity futures |  |
Derivative Liabilities |  |
Gross Amounts of Recognized Liabilities | 1,648 | 173
Gross Amounts Offset in the Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in the Balance Sheet | 1,648 | 173
Collateral Pledged | 1,648 | 173
Net Amount | 0 | 0
Derivative instruments designated as hedges | Foreign currency forward contracts, investment operations |  |
Derivative Assets |  |
Gross Amounts of Recognized Assets | 4,401 | 1,366
Gross Amounts Offset in the Balance Sheet | 0 | 0
Net Amounts of Assets Presented in the Balance Sheet | 4,401 | 1,366
Collateral Received | 0 | 0
Net Amount | 4,401 | 1,366
Derivative Liabilities |  |
Gross Amounts of Recognized Liabilities | 144 | 4,063
Gross Amounts Offset in the Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in the Balance Sheet | 144 | 4,063
Collateral Pledged | 0 | 0
Net Amount | $ 144 | $ 4,063

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