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LOANS AND ALLOWANCE FOR LOAN LOSSES - Allowance for Loan and Lease Losses Additional Information (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
loan
Sep. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Charge-off amount $ 35,546 $ 388   $ 39,060 $ 15,977  
Increase (Decrease) in collateral held under securities lending 5,000          
Total loans 6,383,259 7,253,293   6,383,259 7,253,293 $ 7,700,873
Line of Credit            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Charge-off amount 35,100   $ 13,900      
Total loans     $ 15,000      
Unfunded Loan Commitment            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Unfunded loan commitments $ 4,400     4,400   4,600
Number of loans | loan 53          
Loans and leases receivable, commitments to purchase or sell $ 536,000          
Commercial | Commercial and industrial            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Charge-off amount 34,673 342   36,788 689  
Additional provision towards allowance for loan losses 3,000          
Total loans $ 1,789,478 $ 1,673,055   $ 1,789,478 $ 1,673,055 $ 1,944,142