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COMMITMENTS AND CONTINGENCIES - Schedule of Guarantor Obligations (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Commitments and Contingencies Disclosure [Abstract]    
Commitments to extend credit $ 5,420,227 $ 4,328,749
Unused home equity lines of credit 303,428 272,029
Financial standby letters of credit 30,272 36,184
Mortgage interest rate lock commitments $ 320,320 $ 417,126