LOAN PORTFOLIO - Activity for Impaired Loans (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Impaired Loans:
Balance at beginning of period	$ 806,509	$ 945,407
Loans determined impaired during the period	157,984	62,933
Charge-offs	(8,352)	(11,715)
Loans sold, net charge-offs	0	1,137
Increases to impaired loans (disbursements)	1,347	519
Foreclosures	(7,421)	(9,952)
Loans no longer considered impaired	(20,339)	(9,898)
Paid in full or partial payments	(12,137)	(21,176)
Balance at end of period	$ 917,591	$ 954,981