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DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES - Narrative (Details)
3 Months Ended
Mar. 31, 2017
contract
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Derivative [Line Items]      
Debt face amount   $ 270,000,000  
Cash collateral received   8,306,000 $ 7,900,000
Interest Rate Swaps      
Derivative [Line Items]      
Derivative, instruments terminated | contract 2    
Available-for-sale Securities [Member] | Fixed rate callable securities [Member]      
Derivative [Line Items]      
Hedged Asset, Fair Value Hedge   $ 23,700,000