LOAN PORTFOLIO - Activity for Impaired Loans (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Impaired Loans:
Balance at beginning of period	$ 790,308	$ 887,905	$ 806,509
Loans determined impaired during the period	250,524	140,977	288,202
Charge-offs	(57,152)	(82,113)	(67,210)
Impaired Loans sold, net of charge-offs	(4,121)	(53,245)	(8,675)
Increases to existing impaired loans	7,335	8,292	3,236
Foreclosures	(36,453)	(37,513)	(36,161)
Loans no longer considered impaired	(5,417)	(3,526)	(27,643)
Impaired Loans Transferred from (to) Held For Sale	(74,052)	0	0
Paid in full, partial payments and other	(110,703)	(70,469)	(70,353)
Balance at end of period	$ 760,269	$ 790,308	$ 887,905