LOAN SERVICING RIGHTS - Schedule of Carrying Value of Loan Servicing Rights Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021
Servicing Assets at Fair Value [Line Items]
Loan servicing rights	$ 171,201		$ 150,457
Residential mortgage
Servicing Assets at Fair Value [Line Items]
Loan servicing rights	168,379	$ 160,021	147,014	$ 144,764	$ 257,112	$ 206,944
SBA
Servicing Assets at Fair Value [Line Items]
Loan servicing rights	$ 2,822	$ 3,097	$ 3,443	$ 4,318	$ 4,954	$ 5,556