DERIVATIVE INSTRUMENTS - Schedule of Derivative Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Derivative Fair Values on Consolidated Balance Sheet [Line Items]
Derivative asset fair value	$ 4,466	$ 37,682
Derivative liability fair value	$ 9,666	$ 703
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other assets	Other assets
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Other liabilities	Other liabilities
Not Designated as Hedging Instruments
Derivative Fair Values on Consolidated Balance Sheet [Line Items]
Derivative asset fair value	$ 4,466	$ 37,682
Derivative liability fair value	9,666	703
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	132,246	54,076
Derivative asset fair value	1,144	81
Derivative liability fair value	32	559
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	1,218,702	1,441,273
Derivative asset fair value	3,322	37,601
Derivative liability fair value	$ 9,634	$ 144