LOAN PORTFOLIO - Breakdown Between Accrual and Nonaccrual Status of TDRs (Parenthetical) (Detail) - USD ($) $ in Thousands	Sep. 30, 2016		Jun. 30, 2016	Dec. 31, 2015		Sep. 30, 2015	Jun. 30, 2015	Dec. 31, 2014
Financing Receivable Modifications [Line Items]
Total TDR loans	$ 656,318		$ 670,991	$ 661,591		$ 681,963	$ 634,761	$ 694,453
Non Accrual [Member]
Financing Receivable Modifications [Line Items]
Total TDR loans	240,399	[1]		246,683	[2]
Performing Financing Receivable [Member] | Non Accrual [Member]
Financing Receivable Modifications [Line Items]
Total TDR loans	$ 121,300			$ 118,200

[1] Included in non-accrual loans are $121.3 million in loans that are performing under the terms of the restructuring agreement but are reported in non-accrual status until the restructured loans meet the criteria of sustained payment performance under the revised terms for reinstatement to accrual status and are deemed fully collectible.

[2] Included in non-accrual loans are $118.2 million in loans that are performing under the terms of the restructuring agreement but are reported in non-accrual status until the restructured loans meet the criteria of sustained payment performance under the revised terms for reinstatement to accrual status and there is no doubt about full collectability.