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DERIVATIVE FINANCIAL INSTRUMENTS - Interest rate contracts not designated as hedging instruments (Details) - Not designated - Interest rate swap - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
DERIVATIVE FINANCIAL INSTRUMENTS      
Gross gains $ 13,773 $ 24,758 $ 13,537
Gross losses (13,773) (24,758) (13,500)
Net gains (losses)     $ 37
Other assets      
DERIVATIVE FINANCIAL INSTRUMENTS      
Derivative asset notional amount 115,921 122,313  
Derivative financial assets fair value 8,697 15,360  
Other assets | Commercial Borrower      
DERIVATIVE FINANCIAL INSTRUMENTS      
Derivative asset notional amount 112,041 122,313  
Derivative financial assets fair value 8,622 15,360  
Other assets | Financial Institutions Borrower      
DERIVATIVE FINANCIAL INSTRUMENTS      
Derivative asset notional amount 3,880    
Derivative financial assets fair value 75    
Other liabilities      
DERIVATIVE FINANCIAL INSTRUMENTS      
Derivative liability notional amount 115,921 122,313  
Derivative financial liabilities fair value (8,697) (15,360)  
Other liabilities | Commercial Borrower      
DERIVATIVE FINANCIAL INSTRUMENTS      
Derivative liability notional amount 3,880    
Derivative financial liabilities fair value (75)    
Other liabilities | Financial Institutions Borrower      
DERIVATIVE FINANCIAL INSTRUMENTS      
Derivative liability notional amount 112,041 122,313  
Derivative financial liabilities fair value $ (8,622) $ (15,360)