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DERIVATIVES - Additional Information (Details)
3 Months Ended
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
N
Jun. 30, 2019
USD ($)
N
Dec. 31, 2020
USD ($)
Derivative [Line Items]        
Net interest income (expense) $ 31,793,000 $ 31,747,000    
Accrued interest receivable 23,916,000     $ 22,495,000
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]        
Derivative [Line Items]        
Notional amount 270,000,000.0     270,000,000.0
Net interest income (expense) 1,200,000 106,000    
Unrealized after-tax gain of accumulated other comprehensive income (loss)   26,000 $ 189,000  
Interest income   $ 71,000    
Derivative number of instruments terminated | N   3 4  
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Other Liabilities [Member]        
Derivative [Line Items]        
Notional amount 270,000,000     270,000,000
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Short Term Borrowing [Member]        
Derivative [Line Items]        
Cash flow hedge of short-term borrowing 15,000,000.0      
Loan Level Swaps [Member] | Not Designated as Hedging Instrument [Member]        
Derivative [Line Items]        
Notional amount 789,673,000     $ 823,134,000
Loan Level Swaps [Member] | Not Designated as Hedging Instrument [Member] | Other Assets [Member]        
Derivative [Line Items]        
Accrued interest receivable 4,700,000      
Loan Level Swaps [Member] | Not Designated as Hedging Instrument [Member] | Other Liabilities [Member]        
Derivative [Line Items]        
Accrued interest payable $ 4,700,000