Annual report pursuant to Section 13 and 15(d)

LOANS AND ALLOWANCE FOR LOAN LOSSES (Narrative) (Details)

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LOANS AND ALLOWANCE FOR LOAN LOSSES (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2020
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Nonaccrual loans $ 42,448 $ 28,232 $ 27,000 $ 45,204  
Nonaccrual interest income $ 0 1,800 2,300    
Period for restructured loan to be considered default 90 days        
Acquired performing loan portfolio $ 14,021,314 12,610,936      
Allowance for credit losses on loans 160,540 42,294 $ 41,045 89,778 $ 38,208
Troubled Debt Restructurings (TDRs) 20,616 19,496      
Total Allowance for credit losses 160,540 42,294   $ 94,838  
Loans, recorded investment under the Cares Act 13,860,774 12,568,642      
Troubled Debt Restructurings [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Troubled Debt Restructurings (TDRs) 20,600        
Total Allowance for credit losses 1,600        
Acquired Performing Loan Portfolio          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Acquired performing loan portfolio   3,000,000      
Remaining discount on acquired loans   50,100      
Purchased Impaired          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Acquired performing loan portfolio   86,681      
Allowance for credit losses on loans   217      
Purchased impaired loans (gross)   $ 104,900      
Paycheck Protection Program (PPP)          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans under modified terms $ 146,100