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LOANS AND CREDIT QUALITY - Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2019
Sep. 30, 2020
Financing Receivable, Allowance for Credit Loss [Line Items]            
Accounting Standards Update [Extensible List]         us-gaap:AccountingStandardsUpdate201613Member  
Accounts Receivable, Allowance for Credit Loss [Roll Forward]            
Beginning balance $ 64,047 $ 58,299 $ 64,294 $ 41,772    
Provision for credit losses (4,145) 6,705 (4,516) 21,360    
Net (charge-offs) recoveries (5) (4) 119 25    
Impact of ASC 326 adoption 59,897 65,000 59,897 65,000 $ 41,772  
Ending balance 59,897 65,000 59,897 65,000 41,772  
Allowance for unfunded commitments:            
Beginning balance 1,959 2,307 1,588 1,065    
Provision for credit losses 145 (236) 516 (891)    
Impact of ASC 326 adoption 2,104 2,071 2,104 2,071 1,065 $ 2,071
Ending balance 2,104 2,071 2,104 2,071 1,065  
Total $ (4,000) $ 6,469 $ (4,000) 20,469    
Cumulative Effect, Period of Adoption, Adjustment            
Accounts Receivable, Allowance for Credit Loss [Roll Forward]            
Beginning balance       1,843    
Impact of ASC 326 adoption         1,843  
Ending balance         1,843  
Allowance for unfunded commitments:            
Beginning balance       $ 1,897    
Impact of ASC 326 adoption         1,897  
Ending balance         $ 1,897