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DERIVATIVE INSTRUMENTS - Balance sheet classification of derivatives recorded at fair value (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Asset derivative fair value | $ 3,174 | $ 8,237
Liability derivative fair value | 13,637 | 14,522
Not Designated as Hedging Instruments | Other assets |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Asset derivative fair value | 3,174 | 8,237
Not Designated as Hedging Instruments | Other liabilities |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Liability derivative fair value | 13,637 | 14,522
Not Designated as Hedging Instruments | Investment Portfolio | Foreign exchange forward contracts |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative notional amount | 68,998 | 79,336
Not Designated as Hedging Instruments | Investment Portfolio | Foreign exchange forward contracts | Other assets |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Asset derivative fair value | 0 | 262
Not Designated as Hedging Instruments | Investment Portfolio | Foreign exchange forward contracts | Other liabilities |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Liability derivative fair value | 1,405 | 531
Not Designated as Hedging Instruments | Investment Portfolio | Interest rate swaps |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative notional amount | 0 | 150,000
Not Designated as Hedging Instruments | Investment Portfolio | Interest rate swaps | Other assets |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Asset derivative fair value | 0 | 0
Not Designated as Hedging Instruments | Investment Portfolio | Interest rate swaps | Other liabilities |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Liability derivative fair value | 0 | 1,116
Not Designated as Hedging Instruments | Underwriting Portfolio | Foreign exchange forward contracts |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative notional amount | 1,038,630 | 737,419
Not Designated as Hedging Instruments | Underwriting Portfolio | Foreign exchange forward contracts | Other assets |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Asset derivative fair value | 3,174 | 7,975
Not Designated as Hedging Instruments | Underwriting Portfolio | Foreign exchange forward contracts | Other liabilities |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Liability derivative fair value | 2,560 | 2,576
Not Designated as Hedging Instruments | Underwriting Portfolio | Other underwriting-related derivatives |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative notional amount | 85,000 | 85,000
Not Designated as Hedging Instruments | Underwriting Portfolio | Other underwriting-related derivatives | Other assets |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Asset derivative fair value | 0 | 0
Not Designated as Hedging Instruments | Underwriting Portfolio | Other underwriting-related derivatives | Other liabilities |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Liability derivative fair value | $ 9,672 | $ 10,299

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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13433-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13433-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 + Details
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