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COMMITMENTS AND CONTINGENCIES - Legal Contingencies (Details) - USD ($) $ in Thousands		3 Months Ended
	Feb. 20, 2023	Dec. 31, 2022	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2021
Litigation
Allowance for credit loss		$ 25,333	$ 38,776	$ 24,508	$ 23,936
Unfunded Loan Commitment
Litigation
Allowance for credit loss			3,400
TGC Cases
Litigation
Settlement amount	$ 13,000
Insurance recovery receivable		7,400	7,400
Net settlement amount included in other noninterest expense		5,600
Accrual recorded		13,000	13,000
DeBaere and Miller cases
Litigation
Accrual recorded		2,600	$ 2,600
Accrual included in other noninterest expense		$ 2,600