MORTGAGE BANKING ACTIVITIES - MORTGAGE LOANS HELD FOR SALE (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
MORTGAGE BANKING ACTIVITIES
Balance, beginning of period	$ 13,883	$ 12,653	$ 8,971	$ 5,761
Origination of mortgage loans held for sale	124,375	49,152	247,071	133,273
Proceeds from the sale of mortgage loans held for sale	(108,493)	(55,063)	(229,755)	(134,157)
Net gain on sale of mortgage loans held for sale	2,974	1,120	6,452	2,985
Balance, end of period	$ 32,739	$ 7,862	$ 32,739	$ 7,862