SECURITIES AVAILABLE FOR SALE, HELD TO MATURITY, AND MARKETABLE EQUITY SECURITIES - Debt Securities, Held to Maturity, Allowance for Credit Losses Rollforward (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020
Schedule of Held-to-maturity Securities [Line Items]
Beginning balance	$ 113	$ 0
Provision for credit losses- reversal	17	213
Ending balance	96	96
Municipal bonds and obligations
Schedule of Held-to-maturity Securities [Line Items]
Beginning balance	62	0
Provision for credit losses- reversal	(5)	16
Ending balance	67	67
Tax advantaged economic development bonds
Schedule of Held-to-maturity Securities [Line Items]
Beginning balance	51	0
Provision for credit losses- reversal	22	197
Ending balance	$ 29	29
Cumulative Effect, Period of Adoption, Adjustment
Schedule of Held-to-maturity Securities [Line Items]
Beginning balance		309
Cumulative Effect, Period of Adoption, Adjustment | Municipal bonds and obligations
Schedule of Held-to-maturity Securities [Line Items]
Beginning balance		83
Cumulative Effect, Period of Adoption, Adjustment | Tax advantaged economic development bonds
Schedule of Held-to-maturity Securities [Line Items]
Beginning balance		$ 226