LOAN PORTFOLIO - Breakdown Between Accrual and Nonaccrual Status of TDRs (Detail) - USD ($) $ in Thousands	Jun. 30, 2017		Mar. 31, 2017	Dec. 31, 2016		Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015
Financing Receivable Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	$ 568,543		$ 602,364	$ 647,048		$ 670,991	$ 659,104	$ 661,591
Non Accrual [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	184,371	[1]		262,161	[2]
Accrual [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	384,172			384,887
Non Fha Va Residential Mortgage Loans [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	368,505			375,809
Non Fha Va Residential Mortgage Loans [Member] | Non Accrual [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	74,616	[1]		80,153	[2]
Non Fha Va Residential Mortgage Loans [Member] | Accrual [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	293,889			295,656
Commercial Mortgage Loans [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	50,065			48,742
Commercial Mortgage Loans [Member] | Non Accrual [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	16,659	[1]		16,402	[2]
Commercial Mortgage Loans [Member] | Accrual [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	33,406			32,340
Commercial And Industrial Loan [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	65,886			133,521
Commercial And Industrial Loan [Member] | Non Accrual [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	46,486	[1]		115,025	[2]
Commercial And Industrial Loan [Member] | Accrual [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	19,400			18,496
Consumer Auto Loans [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	23,994			24,875
Consumer Auto Loans [Member] | Non Accrual [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	7,668	[1]		8,622	[2]
Consumer Auto Loans [Member] | Accrual [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	16,326			16,253
Finance Leases [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	2,492			2,647
Finance Leases [Member] | Non Accrual [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	111	[1]		105	[2]
Finance Leases [Member] | Accrual [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	2,381			2,542
Other Consumer Loans [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	12,548			14,842
Other Consumer Loans [Member] | Non Accrual [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	1,405	[1]		2,974	[2]
Other Consumer Loans [Member] | Accrual [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	11,143			11,868
Commercial Construction [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	35,520			36,893
Commercial Construction [Member] | Non Accrual [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	35,520	[1]		36,893	[2]
Commercial Construction [Member] | Accrual [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	0			0
Residential Construction [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	352			357
Residential Construction [Member] | Non Accrual [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	352	[1]		357	[2]
Residential Construction [Member] | Accrual [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	0			0
Land Construction [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	9,181			9,362
Land Construction [Member] | Non Accrual [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	1,554	[1]		1,630	[2]
Land Construction [Member] | Accrual [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	$ 7,627			$ 7,732

[1] Included in non-accrual loans are $47.2 million in loans that are performing under the terms of the restructuring agreement but are reported in nonaccrual 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 $110.6 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.