LOAN PORTFOLIO - Loan Restructuring and Effect on Allowance for Loan and Lease Losses (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016	Dec. 31, 2015
Financing Receivable Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	$ 585,795	$ 656,318	$ 585,795	$ 656,318	$ 568,543	$ 647,048	$ 670,991	$ 661,591
Charges to the provision for loan losses	75,013	21,503	118,551	63,542
Allowance for loan losses at the end of the period	230,870		230,870			205,603
Loans Split [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	35,603	38,004	35,603	38,004
Amount charged-off			0	0
Charges to the provision for loan losses			(1,080)	2,660
Allowance for loan losses at the end of the period	4,061	$ 3,521	4,061	$ 3,521
Accrual [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	$ 388,834		$ 388,834			$ 384,887