COMMITMENTS AND CONTINGENCIES - Schedule of Guarantor Obligations (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Commitments and Contingencies Disclosure [Abstract]
Commitments to extend credit	$ 4,915,246	$ 6,318,039
Unused home equity lines of credit	388,405	345,001
Financial standby letters of credit	41,034	33,557
Mortgage interest rate lock commitments	$ 275,759	$ 148,148