EMPLOYEE BENEFITS, Employee Stock Ownership Plan (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
EMPLOYEE BENEFITS [Abstract]
Required service period for an employee to be covered by ESOP and 401(k) plan	1 month
Contributions to ESOP by employer	$ 1.8	$ 2.0
Shares held by ESOP (in shares)	2,959,826	2,988,470
Shares repurchased from ESOP participants (in shares)	0	0
Fair value of ESOP shares subject to repurchase obligation		$ 58.2