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DERIVATIVE INSTRUMENTS - Schedule of Derivative Instruments (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative asset fair value | $ 13,929 | $ 3,116
Derivative liability fair value | $ 24,493 | $ 20,617
Derivative Asset, Statement of Financial Position [Extensible Enumeration] | Other assets | Other assets
Derivative Liability, Statement of Financial Position [Extensible Enumeration] | Other liabilities | Other liabilities
Not Designated as Hedging Instruments |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative asset fair value | $ 13,929 | $ 3,116
Derivative liability fair value | 24,493 | 20,617
Not Designated as Hedging Instruments | Relating to investment portfolio: | Foreign exchange forward contracts |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative notional amount | 151,002 | 184,187
Derivative asset fair value | 1,710 | 13
Derivative liability fair value | 14 | 1,463
Not Designated as Hedging Instruments | Relating to underwriting portfolio: | Foreign exchange forward contracts |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative notional amount | 1,288,186 | 1,258,836
Derivative asset fair value | 12,219 | 3,103
Derivative liability fair value | 20,193 | 13,524
Not Designated as Hedging Instruments | Relating to underwriting portfolio: | Other underwriting-related contracts |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative notional amount | 50,000 | 50,000
Derivative asset fair value | 0 | 0
Derivative liability fair value | $ 4,286 | $ 5,630

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