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RESERVE FOR LOSSES AND LOSS EXPENSES - Summary of Prior Year Development (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |
Prior year favorable (adverse) adjustments | $ 25,533 | $ 32,410 | $ 15,909
Insurance |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |
Prior year favorable (adverse) adjustments | 16,350 | 18,360 | 8,937
Reinsurance |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |
Prior year favorable (adverse) adjustments | $ 9,183 | $ 14,049 | $ 6,972

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- Definition Amount, after effects of reinsurance, of expense (reversal of expense) for claims incurred in prior reporting periods and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 + Details
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