LOANS AND ALLOWANCE FOR CREDIT LOSSES - Schedule of Past Due (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Financing Receivable, Past Due [Line Items]
Total allowance for credit losses on loans	$ 1,420,955	$ 1,411,784
Current
Financing Receivable, Past Due [Line Items]
Total allowance for credit losses on loans	1,408,005	1,393,274
Current \| Entity Loan Modification Program
Financing Receivable, Past Due [Line Items]
Total allowance for credit losses on loans	5,444
30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total allowance for credit losses on loans	2,154	10,816
30-59 Days Past Due \| Entity Loan Modification Program
Financing Receivable, Past Due [Line Items]
Total allowance for credit losses on loans	0
60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total allowance for credit losses on loans	162	595
60-89 Days Past Due \| Entity Loan Modification Program
Financing Receivable, Past Due [Line Items]
Total allowance for credit losses on loans	0
Greater Than 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total allowance for credit losses on loans	224	$ 246
Greater Than 89 Days Past Due \| Entity Loan Modification Program
Financing Receivable, Past Due [Line Items]
Total allowance for credit losses on loans	0
Commercial real estate \| Current \| Entity Loan Modification Program
Financing Receivable, Past Due [Line Items]
Total allowance for credit losses on loans	5,359
Commercial real estate \| 30-59 Days Past Due \| Entity Loan Modification Program
Financing Receivable, Past Due [Line Items]
Total allowance for credit losses on loans	0
Commercial real estate \| 60-89 Days Past Due \| Entity Loan Modification Program
Financing Receivable, Past Due [Line Items]
Total allowance for credit losses on loans	0
Commercial real estate \| Greater Than 89 Days Past Due \| Entity Loan Modification Program
Financing Receivable, Past Due [Line Items]
Total allowance for credit losses on loans	0
Commercial and industrial \| Current \| Entity Loan Modification Program
Financing Receivable, Past Due [Line Items]
Total allowance for credit losses on loans	25
Commercial and industrial \| 30-59 Days Past Due \| Entity Loan Modification Program
Financing Receivable, Past Due [Line Items]
Total allowance for credit losses on loans	0
Commercial and industrial \| 60-89 Days Past Due \| Entity Loan Modification Program
Financing Receivable, Past Due [Line Items]
Total allowance for credit losses on loans	0
Commercial and industrial \| Greater Than 89 Days Past Due \| Entity Loan Modification Program
Financing Receivable, Past Due [Line Items]
Total allowance for credit losses on loans	0
Residential mortgage \| Current \| Entity Loan Modification Program
Financing Receivable, Past Due [Line Items]
Total allowance for credit losses on loans	38
Residential mortgage \| 30-59 Days Past Due \| Entity Loan Modification Program
Financing Receivable, Past Due [Line Items]
Total allowance for credit losses on loans	0
Residential mortgage \| 60-89 Days Past Due \| Entity Loan Modification Program
Financing Receivable, Past Due [Line Items]
Total allowance for credit losses on loans	0
Residential mortgage \| Greater Than 89 Days Past Due \| Entity Loan Modification Program
Financing Receivable, Past Due [Line Items]
Total allowance for credit losses on loans	0
Other consumer \| Current \| Entity Loan Modification Program
Financing Receivable, Past Due [Line Items]
Total allowance for credit losses on loans	22
Other consumer \| 30-59 Days Past Due \| Entity Loan Modification Program
Financing Receivable, Past Due [Line Items]
Total allowance for credit losses on loans	0
Other consumer \| 60-89 Days Past Due \| Entity Loan Modification Program
Financing Receivable, Past Due [Line Items]
Total allowance for credit losses on loans	0
Other consumer \| Greater Than 89 Days Past Due \| Entity Loan Modification Program
Financing Receivable, Past Due [Line Items]
Total allowance for credit losses on loans	$ 0