COMMITMENTS AND CONTINGENT LIABILITIES - Schedule of Guarantor Obligations (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Commitments to extend credit	$ 4,328,749	$ 2,826,719
Unused home equity lines of credit	272,029	259,015
Financial standby letters of credit	36,184	33,613
Mortgage interest rate lock commitments	$ 417,126	$ 1,199,939