INVESTMENT SECURITIES (Other Investments) (Details)	3 Months Ended	6 Months Ended
	Jun. 30, 2020 USD ($) $ / shares	Jun. 30, 2020 USD ($) $ / shares
Investments, Debt and Equity Securities [Abstract]
FHLB Stock, par value (in usd per share) | $ / shares	$ 100	$ 100
Purchases of FHLB stock	$ 2,900,000	$ 118,600,000
FHLB stock redeemed	$ 128,600,000	176,000,000.0
Gain (loss) on redemption of FHLB stock		0
Purchase of FRB stock		$ 0