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DERIVATIVE INSTRUMENTS (Schedule of Derivative Instruments) (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative asset fair value | $ 863 | $ 8,237
Derivative liability fair value | 12,948 | 14,522
Other assets | Not Designated as Hedging Instruments |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative asset fair value | 863 | 8,237
Other liabilities | Not Designated as Hedging Instruments |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative liability fair value | 12,948 | 14,522
Investment Portfolio | Foreign exchange forward contracts | Not Designated as Hedging Instruments |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative notional amount | 189,811 | 79,336
Investment Portfolio | Foreign exchange forward contracts | Other assets | Not Designated as Hedging Instruments |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative asset fair value | 147 | 262
Investment Portfolio | Foreign exchange forward contracts | Other liabilities | Not Designated as Hedging Instruments |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative liability fair value | 1,074 | 531
Investment Portfolio | Interest rate swaps | Not Designated as Hedging Instruments |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative notional amount | 0 | 150,000
Investment Portfolio | Interest rate swaps | Other assets | Not Designated as Hedging Instruments |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative asset fair value | 0 | 0
Investment Portfolio | Interest rate swaps | Other liabilities | Not Designated as Hedging Instruments |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative liability fair value | 0 | 1,116
Underwriting Portfolio | Foreign exchange forward contracts | Not Designated as Hedging Instruments |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative notional amount | 534,811 | 737,419
Underwriting Portfolio | Foreign exchange forward contracts | Other assets | Not Designated as Hedging Instruments |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative asset fair value | 716 | 7,975
Underwriting Portfolio | Foreign exchange forward contracts | Other liabilities | Not Designated as Hedging Instruments |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative liability fair value | 1,612 | 2,576
Underwriting Portfolio | Other underwriting-related contracts | Not Designated as Hedging Instruments |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative notional amount | 85,000 | 85,000
Underwriting Portfolio | Other underwriting-related contracts | Other assets | Not Designated as Hedging Instruments |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative asset fair value | 0 | 0
Underwriting Portfolio | Other underwriting-related contracts | Other liabilities | Not Designated as Hedging Instruments |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative liability fair value | $ 10,262 | $ 10,299

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