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DERIVATIVE INSTRUMENTS (Schedule of Derivative Instruments) (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative asset fair value | $ 3,140 | $ 18,875
Derivative liability fair value | 18,382 | 11,486
Not Designated as Hedging Instruments | Other assets |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative asset fair value | 3,140 | 18,875
Not Designated as Hedging Instruments | Other liabilities |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative liability fair value | 18,382 | 11,486
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 | 331,567 | 105,781
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 | 3,080 | 2
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 | 309 | 2,364
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 | 1,118,590 | 1,197,012
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 | 60 | 18,873
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 | 9,956 | 0
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 | 75,000 | 75,000
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 | $ 8,117 | $ 9,122

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