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COMMITMENTS AND CONTINGENCIES - Legal Contingencies (Details) - USD ($)
$ in Millions
3 Months Ended
Feb. 20, 2023
Dec. 31, 2022
TGC Cases    
Litigation    
Settlement amount $ 13.0  
Accrual recorded   $ 13.0
Insurance recovery receivable   7.4
Net settlement amount included in other noninterest expense   5.6
DeBaere and Miller cases    
Litigation    
Accrual recorded   $ 2.6