DERIVATIVES AND HEDGING ACTIVITIES - Schedule of Interest Rate Swap on Consolidated Statement of Income (Details) - Interest Rate Swap - Designated as Hedging Instrument - Fair Value Hedging - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Net effect on interest income	$ (3,453)	$ 1,406	$ (7,343)	$ 1,519
Interest Income on Loans
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative - interest rate swap, interest income	(3,437)	1,400	(7,383)	1,514
Hedged items - loans, interest income	$ (16)	$ 6	$ 40	$ 5