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RECENTLY ADOPTED AND ISSUED ACCOUNTING STANDARDS (Details) - USD ($)
$ in Thousands
3 Months Ended
Jan. 01, 2020
Mar. 31, 2020
Mar. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Line Items]          
Loans and Leases Receivable, Allowance $ 119,155 $ 143,885 $ 169,923 $ 175,679 $ 57,650
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method 61,505 61,505      
Deferred Tax Liabilities, Deferred Expense 16,252       33,030
Deferred tax liability, Credit Loss, Change in Method, Credit Loss Expense (Reversal) (16,778)        
Off-Balance Sheet, Credit Loss, Liability 12,740       585
Off-Balance Sheet, Credit Loss, Liability, Change in Method, Credit Loss Expense (Reversal) 12,155        
Commercial          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Loans and Leases Receivable, Allowance 28,485 45,410 45,139 51,454 18,584
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method 9,901 9,901      
Lease financing          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Loans and Leases Receivable, Allowance 1,089 1,494 1,015 995 971
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method 118 118      
Construction real estate          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Loans and Leases Receivable, Allowance 13,960 13,511 22,734 21,736 2,381
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method 11,579 11,579      
Commercial real estate          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Loans and Leases Receivable, Allowance 47,697 53,154 78,669 76,795 23,579
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method 24,118 24,118      
Residential real estate          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Loans and Leases Receivable, Allowance 10,789 11,284 7,748 8,560 5,299
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method 5,490 5,490      
Home equity          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Loans and Leases Receivable, Allowance 13,217 14,827 10,760 11,869 4,787
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method 8,430 8,430      
Installment          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Loans and Leases Receivable, Allowance 1,193 1,238 1,235 1,215 392
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method 801 801      
Credit card          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Loans and Leases Receivable, Allowance 2,725 2,967 $ 2,623 $ 3,055 $ 1,657
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method $ 1,068 $ 1,068