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DERIVATIVE INSTRUMENTS - Schedule of Derivative Instruments (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative asset fair value | $ 1,091 | $ 3,116
Derivative liability fair value | 23,966 | 20,617
Not Designated as Hedging Instruments | Other Assets |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative asset fair value | 1,091 | 3,116
Not Designated as Hedging Instruments | Other liabilities |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative liability fair value | 23,966 | 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 | 221,208 | 184,187
Not Designated as Hedging Instruments | Relating to investment portfolio: | Foreign exchange forward contracts | Other Assets |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative asset fair value | 1,085 | 13
Not Designated as Hedging Instruments | Relating to investment portfolio: | Foreign exchange forward contracts | Other liabilities |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative liability fair value | 197 | 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 | 1,077,969 | 1,258,836
Not Designated as Hedging Instruments | Relating to underwriting portfolio: | Foreign exchange forward contracts | Other Assets |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative asset fair value | 6 | 3,103
Not Designated as Hedging Instruments | Relating to underwriting portfolio: | Foreign exchange forward contracts | Other liabilities |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative liability fair value | 18,695 | 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
Not Designated as Hedging Instruments | Relating to underwriting portfolio: | Other underwriting-related contracts | Other Assets |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative asset fair value | 0 | 0
Not Designated as Hedging Instruments | Relating to underwriting portfolio: | Other underwriting-related contracts | Other liabilities |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative liability fair value | $ 5,074 | $ 5,630

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