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DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES - Additional information (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2021
USD ($)
item
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
item
Mar. 31, 2021
USD ($)
Apr. 30, 2020
USD ($)
Nov. 30, 2019
USD ($)
Derivative [Line Items]            
Acquisition, conversion and other expenses $ 1,667 $ 5,801 $ 8,317      
Notional amount of interest rate swap $ 943,623 876,603        
Interest rate swap on variable rate loans            
Derivative [Line Items]            
Notional amount of interest rate swap       $ 50,000    
Interest rate swap on variable rate loans | London Interbank Offered Rate Less Two Days            
Derivative [Line Items]            
Variable interest rate       0.806%    
Interest rate swap on deposits            
Derivative [Line Items]            
Derivative, Number of Instruments Held | item 2          
Term of interest rate swap 5 years          
Fixed rate of interest rate swap         0.59% 1.53%
Notional amount of interest rate swap         $ 25,000 $ 50,000
Designated as hedging instrument | Cash flow hedges            
Derivative [Line Items]            
Notional amount of interest rate swap $ 125,000 75,000        
Designated as hedging instrument | Cash flow hedges | Interest rate cap agreements            
Derivative [Line Items]            
Notional amount of interest rate swap 75,000          
Designated as hedging instrument | Cash flow hedges | Interest rate swap on variable rate loans            
Derivative [Line Items]            
Notional amount of interest rate swap 50,000          
Designated as hedging instrument | Cash flow hedges | Interest rate swap on deposits            
Derivative [Line Items]            
Notional amount of interest rate swap   75,000        
Designated as hedging instrument | Fair Value Hedging            
Derivative [Line Items]            
Notional amount of interest rate swap 37,190 37,190        
Designated as hedging instrument | Fair Value Hedging | Interest rate swap on deposits            
Derivative [Line Items]            
Derivative, Number of Instruments Held | item     8      
Notional amount of interest rate swap $ 37,190 $ 37,190 $ 37,200      
Fixed interest rate, weighted average     1.696%