MORTGAGE BANKING ACTIVITIES - MORTGAGE LOANS HELD FOR SALE (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
MORTGAGE BANKING ACTIVITIES
Balance, beginning of period	$ 39,384	$ 11,313	$ 19,224	$ 8,971
Origination of mortgage loans held for sale	218,668	81,982	343,941	122,696
Proceeds from the sale of mortgage loans held for sale	(226,723)	(81,630)	(336,641)	(121,262)
Net gain on sale of mortgage loans held for sale	8,699	2,218	13,504	3,478
Balance, end of period	$ 40,028	$ 13,883	$ 40,028	$ 13,883