LOAN PORTFOLIO - Breakdown Between Accrual and Nonaccrual Status of TDRs (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014		Jun. 30, 2014	Dec. 31, 2013
Financing Receivable Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	$ 701,143	[1]	$ 628,233	$ 630,258	[2]
Non Fha Va Residential Mortgage Loans [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	348,446			337,243
Commercial Mortgage Loans [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	134,934			153,575
Commercial And Industrial Loan [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	174,297			91,950
Construction Loans [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	13,200
Consumer Auto Loans [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	15,733			14,122
Finance Leases [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	2,163			2,360
Other Consumer Loans [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	12,343			10,865
Non Accrual [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	216,060	[3],[4]		204,875	[5],[6]
Non Accrual [Member] | Non Fha Va Residential Mortgage Loans [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	88,697	[3],[4]		73,324	[5],[6]
Non Accrual [Member] | Commercial Mortgage Loans [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	62,333	[3],[4]		69,156	[5],[6]
Non Accrual [Member] | Commercial And Industrial Loan [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	47,119	[3],[4]		38,441	[5],[6]
Non Accrual [Member] | Consumer Auto Loans [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	6,149	[3],[4]		5,610	[5],[6]
Non Accrual [Member] | Finance Leases [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	247	[3],[4]		85	[5],[6]
Non Accrual [Member] | Other Consumer Loans [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	2,631	[3],[4]		2,448	[5],[6]
Accrual [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	485,083			425,383
Accrual [Member] | Non Fha Va Residential Mortgage Loans [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	259,749			263,919
Accrual [Member] | Commercial Mortgage Loans [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	72,601			84,419
Accrual [Member] | Commercial And Industrial Loan [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	127,178			53,509
Accrual [Member] | Consumer Auto Loans [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	9,584			8,512
Accrual [Member] | Finance Leases [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	1,916			2,275
Accrual [Member] | Other Consumer Loans [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	9,712			8,417
Non Fha Va Residential Mortgage Loans [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	348,446			337,244
Commercial Mortgage Loans [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	134,934			153,576
Commercial And Industrial Loan [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	174,297			91,951
Consumer Auto Loans [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	15,733			14,122
Finance Leases [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	2,163			2,358
Other Consumer Loans [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	12,343			10,864
Commercial Construction [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment				3,924
Commercial Construction [Member] | Non Accrual [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment				3,924	[5],[6]
Commercial Construction [Member] | Accrual [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment				0
Residential Construction [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	9,960			10,894
Residential Construction [Member] | Non Accrual [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	6,589	[3],[4]		7,562	[5],[6]
Residential Construction [Member] | Accrual [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	3,371			3,332
Land Construction [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	3,267			5,325
Land Construction [Member] | Non Accrual [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	2,295	[3],[4]		4,325	[5],[6]
Land Construction [Member] | Accrual [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	$ 972			$ 1,000

[1]  Excludes TDRs held for sale amounting to $45.7 million as of September 30, 2014

[2]  Excludes TDRs held for sale amounting to $45.9 million as of December 31, 2013.

[3] Included in non-accrual loans are $65.8 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.

[4] Excludes non-accrual TDRs held for sale with a carrying value of $45.7 million as of September 30, 2014.

[5] Included in non-accrual loans are $95.7 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.

[6] Excludes non-accrual TDRs held for sale with a carrying value of $45.9 million as of December 31, 2013.