DERIVATIVE INSTRUMENTS - Summary of Location and Amounts of Derivative Fair Values on the Consolidated Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Derivative Fair Values on Consolidated Balance Sheet [Line Items]
Derivative asset fair value	$ 37,682	$ 3,116
Derivative liability fair value	$ 703	$ 20,617
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	$ 37,682	$ 3,116
Derivative liability fair value	703	20,617
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	54,076	184,187
Derivative asset fair value	81	13
Derivative liability fair value	559	1,463
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	1,441,273	1,258,836
Derivative asset fair value	37,601	3,103
Derivative liability fair value	144	13,524
Not Designated as Hedging Instruments | Relating to underwriting portfolio: | Other underwriting-related contracts
Derivative Fair Values on Consolidated Balance Sheet [Line Items]
Derivative notional amount	0	50,000
Derivative asset fair value	0	0
Derivative liability fair value	$ 0	$ 5,630