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DERIVATIVE INSTRUMENTS (Schedule of Derivative Instruments) (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative asset fair value | $ 7,267 | $ 3,174
Derivative liability fair value | 11,026 | 13,637
Not Designated as Hedging Instruments | Other assets |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative asset fair value | 7,267 | 3,174
Not Designated as Hedging Instruments | Other liabilities |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative liability fair value | 11,026 | 13,637
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 | 256,338 | 68,998
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 | 1,804 | 0
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 | 201 | 1,405
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 | 1,009,860 | 1,038,630
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 | 5,463 | 3,174
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 | 1,377 | 2,560
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 | 85,000
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 | $ 9,448 | $ 9,672

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