LOAN PORTFOLIO - Breakdown Between Accrual and Nonaccrual Status of TDRs (Parenthetical) (Detail) - USD ($) $ in Thousands	Mar. 31, 2016		Dec. 31, 2015		Mar. 31, 2015	Dec. 31, 2014
Financing Receivable Modifications [Line Items]
Total TDR loans	$ 659,104		$ 661,591		$ 705,123	$ 694,453
Non Accrual [Member]
Financing Receivable Modifications [Line Items]
Total TDR loans	245,671	[1]	246,683	[2]
Performing Financing Receivable [Member] | Non Accrual [Member]
Financing Receivable Modifications [Line Items]
Total TDR loans	$ 119,200		$ 118,200

[1] Included in non-accrual loans are $119.2 million in loans that are performing under the terms of a 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.

[2] Included in non-accrual loans are $118.2 million in loans that are performing under the terms of a 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.