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DERIVATIVE INSTRUMENTS - Consolidated Balance Sheets and Fair Value of the Principal Derivative Instruments (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Derivative Assets |  |
Gross Amounts of Recognized Assets | $ 33,435 | $ 44,421
Gross Amounts Offset in the Balance Sheet | 0 | 0
Net Amounts of Assets Presented in the Balance Sheet | 33,435 | 44,421
Collateral Received | 0 | 0
Net Amount | 33,435 | 44,421
Derivative Liabilities |  |
Gross Amounts of Recognized Liabilities | 16,587 | 7,581
Gross Amounts Offset in the Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in the Balance Sheet | 16,587 | 7,581
Collateral Pledged | 9,769 | 309
Net Amount | 6,818 | 7,272
Derivative instruments not designated as hedges |  |
Derivative Assets |  |
Gross Amounts of Recognized Assets | 32,839 | 44,421
Gross Amounts Offset in the Balance Sheet | 0 | 0
Net Amounts of Assets Presented in the Balance Sheet | 32,839 | 44,421
Collateral Received | 0 | 0
Net Amount | 32,839 | 44,421
Derivative Liabilities |  |
Gross Amounts of Recognized Liabilities | 16,587 | 6,388
Gross Amounts Offset in the Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in the Balance Sheet | 16,587 | 6,388
Collateral Pledged | 9,769 | 309
Net Amount | 6,818 | 6,079
Derivative instruments not designated as hedges | Interest rate futures |  |
Derivative Assets |  |
Gross Amounts of Recognized Assets | 3,961 | 387
Gross Amounts Offset in the Balance Sheet | 0 | 0
Net Amounts of Assets Presented in the Balance Sheet | 3,961 | 387
Collateral Received | 0 | 0
Net Amount | 3,961 | 387
Derivative Liabilities |  |
Gross Amounts of Recognized Liabilities | 3,475 | 1,685
Gross Amounts Offset in the Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in the Balance Sheet | 3,475 | 1,685
Collateral Pledged | 3,387 | 209
Net Amount | 88 | 1,476
Derivative instruments not designated as hedges | Foreign currency forward contracts, underwriting and non-investment operations |  |
Derivative Assets |  |
Gross Amounts of Recognized Assets | 18,952 | 31,755
Gross Amounts Offset in the Balance Sheet | 0 | 0
Net Amounts of Assets Presented in the Balance Sheet | 18,952 | 31,755
Collateral Received | 0 | 0
Net Amount | 18,952 | 31,755
Derivative Liabilities |  |
Gross Amounts of Recognized Liabilities | 4,100 | 1,160
Gross Amounts Offset in the Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in the Balance Sheet | 4,100 | 1,160
Collateral Pledged | 0 | 0
Net Amount | 4,100 | 1,160
Derivative instruments not designated as hedges | Foreign currency forward contracts, investment operations |  |
Derivative Assets |  |
Gross Amounts of Recognized Assets | 9,889 | 11,866
Gross Amounts Offset in the Balance Sheet | 0 | 0
Net Amounts of Assets Presented in the Balance Sheet | 9,889 | 11,866
Collateral Received | 0 | 0
Net Amount | 9,889 | 11,866
Derivative Liabilities |  |
Gross Amounts of Recognized Liabilities | 1,852 | 2,165
Gross Amounts Offset in the Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in the Balance Sheet | 1,852 | 2,165
Collateral Pledged | 0 | 0
Net Amount | 1,852 | 2,165
Derivative instruments not designated as hedges | Credit default swaps |  |
Derivative Assets |  |
Gross Amounts of Recognized Assets | 37 | 413
Gross Amounts Offset in the Balance Sheet | 0 | 0
Net Amounts of Assets Presented in the Balance Sheet | 37 | 413
Collateral Received | 0 | 0
Net Amount | 37 | 413
Derivative Liabilities |  |
Gross Amounts of Recognized Liabilities | 5,650 | 1,055
Gross Amounts Offset in the Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in the Balance Sheet | 5,650 | 1,055
Collateral Pledged | 4,872 | 100
Net Amount | 778 | 955
Derivative instruments not designated as hedges | Equity futures |  |
Derivative Liabilities |  |
Gross Amounts of Recognized Liabilities | 1,510 | 323
Gross Amounts Offset in the Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in the Balance Sheet | 1,510 | 323
Collateral Pledged | 1,510 | 0
Net Amount | 0 | 323
Derivative instruments designated as hedges | Foreign currency forward contracts, investment operations |  |
Derivative Assets |  |
Gross Amounts of Recognized Assets | 596 |
Gross Amounts Offset in the Balance Sheet | 0 |
Net Amounts of Assets Presented in the Balance Sheet | 596 |
Collateral Received | 0 |
Net Amount | $ 596 |
Derivative Liabilities |  |
Gross Amounts of Recognized Liabilities |  | 1,193
Gross Amounts Offset in the Balance Sheet |  | 0
Net Amounts of Liabilities Presented in the Balance Sheet |  | 1,193
Collateral Pledged |  | 0
Net Amount |  | $ 1,193

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