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DERIVATIVE INSTRUMENTS (Schedule of Derivative Instruments) (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative Asset Fair Value | $ 3,468 | $ 8,237
Derivative Liability Fair Value | 13,837 | 14,522
Other assets | Not Designated as Hedging Instruments |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative Asset Fair Value | 3,468 | 8,237
Other liabilities | Not Designated as Hedging Instruments |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative Liability Fair Value | 13,837 | 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 | 172,306 | 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 | 818 | 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 | 284 | 531
Investment Portfolio | Interest rate swaps | Not Designated as Hedging Instruments |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative notional amount | 85,000 | 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 | 984 | 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 | 543,174 | 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 | 1,666 | 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 | 3,320 | 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 | $ 10,233 | $ 10,299

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