LOANS - Impaired Loans (prior to the adoption of Topic 326) (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Financing Receivable, Impaired [Line Items]
Individually impaired loans		$ 14,310	$ 27,000
Impaired loans	$ 1,037	$ 3,209
Other Impaired Performing Loans
Financing Receivable, Impaired [Line Items]
Impaired loans			$ 1,100