COMMITMENTS AND CONTINGENCIES - Schedule of Guarantor Obligations (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Commitments and Contingencies Disclosure [Abstract]
Commitments to extend credit	$ 3,768,159	$ 3,578,227
Unused home equity lines of credit	456,812	437,304
Financial standby letters of credit	45,080	39,507
Mortgage interest rate lock commitments	$ 339,782	$ 192,528