INVESTMENTS - Narrative (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Fair Value, Separate Account Investment [Line Items]
Book value of debt securities pledged as collateral	$ 1,536,632	$ 1,626,295
Asset pledged as collateral | Deposits
Fair Value, Separate Account Investment [Line Items]
Book value of debt securities pledged as collateral	776,800	$ 533,900
Government National Mortgage Association Certificates and Obligations Federal National Mortgage Association Certificates and Obligations and Federal Home Loan Mortgage Corporation Certificates and Obligations | Collateralized mortgage obligations
Fair Value, Separate Account Investment [Line Items]
Mortgage-backed securities	466,700
Government National Mortgage Association Certificates and Obligations Federal National Mortgage Association Certificates and Obligations and Federal Home Loan Mortgage Corporation Certificates and Obligations | Collateralized mortgage backed securities
Fair Value, Separate Account Investment [Line Items]
Mortgage-backed securities	611,300
Government National Mortgage Association Certificates and Obligations Federal National Mortgage Association Certificates and Obligations and Federal Home Loan Mortgage Corporation Certificates and Obligations | SBA asset backed securities
Fair Value, Separate Account Investment [Line Items]
Mortgage-backed securities	$ 38,500