Quarterly report pursuant to Section 13 or 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
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2020
Jun. 30, 2020
Jan. 01, 2020
Dec. 31, 2019
Sep. 30, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Nonaccrual loans $ 39,023 $ 39,023   $ 45,204 $ 28,232    
Nonaccrual interest income 0 $ 0          
Period for restructured loan to be considered default   90 days          
Acquired performing loan portfolio 14,383,215 $ 14,383,215     12,610,936    
Allowance for credit losses on loans 174,122 174,122 $ 169,977 89,778 42,294 $ 43,820 $ 41,045
Troubled Debt Restructurings (TDRs) 21,560 21,560     19,496    
Total Allowance for credit losses 174,122 174,122   $ 94,838 42,294    
Loans, recorded investment under the Cares Act 14,209,093 14,209,093     12,568,642    
Troubled Debt Restructurings [Member]              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Troubled Debt Restructurings (TDRs) 21,600 21,600          
Total Allowance for credit losses 2,700 2,700          
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 68,800 68,800     86,681    
Allowance for credit losses on loans 4,700 4,700     217    
Purchased impaired loans (gross)         $ 104,900    
Paycheck Protection Program (PPP)              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loans, recorded investment under the Cares Act $ 769,600 $ 769,600