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DERIVATIVE FINANCIAL INSTRUMENTS - Derivative instrument assets and liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Designated | Cash flow hedge    
DERIVATIVE FINANCIAL INSTRUMENTS    
Total $ (898) $ 151
Designated | Cash flow hedge | Other assets    
DERIVATIVE FINANCIAL INSTRUMENTS    
Fair value recorded in other assets   151
Designated | Cash flow hedge | Other liabilities    
DERIVATIVE FINANCIAL INSTRUMENTS    
Fair value recorded in other liabilities (898)  
Not designated | Interest rate swap | Other assets    
DERIVATIVE FINANCIAL INSTRUMENTS    
Fair value recorded in other assets 11,766 3,074
Not designated | Interest rate swap | Other liabilities    
DERIVATIVE FINANCIAL INSTRUMENTS    
Fair value recorded in other liabilities $ (11,766) $ (3,074)