DEPOSITS - Components of Interest Expense on Deposits (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Deposits [Line Items]
Interest expense on deposits	$ 16,453	$ 16,130	$ 47,804	$ 49,104
Accretion Of Premium From Acquisitions	(9)	(43)	(47)	(181)
Amortization of broker placement fees	454	655	1,461	2,300
Interest expense on deposits	$ 16,898	$ 16,742	$ 49,218	$ 51,223