LOAN PORTFOLIO - Activity for Specific Reserve (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Specific Reserve:
Balance at beginning of period	$ 40,794	$ 86,372	$ 64,421	$ 52,581
Provision for loan losses	13,819	16,619	50,014	70,011
Financing Receivable Allowance For Credit Losses Net Write Offs Impaired Loans	(6,458)	(30,309)	(66,280)	(49,910)
Balance at end of period	$ 48,155	$ 72,682	$ 48,155	$ 72,682