LOANS - Impaired Loans (prior to the adoption of Topic 326) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Financing Receivable, Impaired [Line Items]
Individually impaired loans	$ 22,501		$ 16,084	$ 27,000
Impaired loans	$ 16,143	$ 1,057	$ 20,286
Other Impaired Performing Loans
Financing Receivable, Impaired [Line Items]
Impaired loans				$ 1,100