COMMITMENTS AND CONTINGENCIES - Schedule of Guarantor Obligations (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
Commitments to extend credit	$ 4,817,539	$ 4,328,749
Unused home equity lines of credit	284,144	272,029
Financial standby letters of credit	31,440	36,184
Mortgage interest rate lock commitments	$ 520,939	$ 417,126