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LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES Summary of Total Loans Rated Special Mention or Lower (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Line Items]    
Total loans $ 7,232,591 $ 8,081,519
Non-Accrual | Performing    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Total loans 47,605 64,948
Substandard Accruing | Performing    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Total loans 147,685 185,207
Total Classified | Performing    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Total loans 195,290 250,155
Special Mention | Performing    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Total loans 132,337 109,299
Total Criticized | Performing    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Total loans $ 327,627 $ 359,454