INVESTMENT SECURITIES - Narrative (Details) $ in Millions	3 Months Ended
	Mar. 31, 2020 position	Dec. 31, 2019 USD ($)
Investments, Debt and Equity Securities [Abstract]
Equity securities | $		$ 7
Percentage of debt securities considered to be of investment-grade (percent)	96.00%
Maximum individual state general bond obligation as a percentage of total debt securities (percent)	1.00%
Securities in unrealized loss positions, number of positions	450
Securities, number of positions	1,500