LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES - Schedule of Total Loans Rated Special Mention or Lower (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Allowance for loan losses
Financing receivable, before allowance for credit loss	$ 9,039,686	$ 8,335,309
Total Criticized | Performing
Allowance for loan losses
Financing receivable, before allowance for credit loss	244,598	187,906
Total Classified | Performing
Allowance for loan losses
Financing receivable, before allowance for credit loss	153,096	119,779
Nonaccrual | Performing
Allowance for loan losses
Financing receivable, before allowance for credit loss	21,407	31,114
Substandard Accruing | Performing
Allowance for loan losses
Financing receivable, before allowance for credit loss	131,689	88,665
Special Mention | Performing
Allowance for loan losses
Financing receivable, before allowance for credit loss	$ 91,502	$ 68,127