LOAN PORTFOLIO- Selected Information on TDRs includes Recorded Investment by Loan Class and Modification Type (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	$ 694,453	[1]	$ 630,258	[2]	$ 941,730
Troubled Debt Restructurings Interest Rate Below Market [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	68,455	[1]	79,229	[2]
Troubled Debt Restructurings Maturity Or Term Extension [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	100,662	[1]	34,805	[2]
Troubled Debt Restructurings Combination Of Reduction In Interest Rate And Extension Of Maturity [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	415,187	[1]	398,307	[2]
Troubled Debt Restructurings Forgiveness Of Principal And Interest [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	3,517	[1]	4,123	[2]
Troubled Debt Restructurings Other [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	106,632	[1],[3]	113,794	[2],[4]
Non Fha Va Residential Mortgage Loans [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	349,775		337,244
Non Fha Va Residential Mortgage Loans [Member] | Troubled Debt Restructurings Interest Rate Below Market [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	24,850		23,428
Non Fha Va Residential Mortgage Loans [Member] | Troubled Debt Restructurings Maturity Or Term Extension [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	5,859		6,059
Non Fha Va Residential Mortgage Loans [Member] | Troubled Debt Restructurings Combination Of Reduction In Interest Rate And Extension Of Maturity [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	283,317		274,562
Non Fha Va Residential Mortgage Loans [Member] | Troubled Debt Restructurings Forgiveness Of Principal And Interest [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	0		0
Non Fha Va Residential Mortgage Loans [Member] | Troubled Debt Restructurings Other [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	35,749	[3]	33,195	[4]
Commercial Mortgage Loans [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	127,766		153,576
Commercial Mortgage Loans [Member] | Troubled Debt Restructurings Interest Rate Below Market [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	29,881		36,543
Commercial Mortgage Loans [Member] | Troubled Debt Restructurings Maturity Or Term Extension [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	12,737		12,985
Commercial Mortgage Loans [Member] | Troubled Debt Restructurings Combination Of Reduction In Interest Rate And Extension Of Maturity [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	72,493		83,993
Commercial Mortgage Loans [Member] | Troubled Debt Restructurings Forgiveness Of Principal And Interest [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	0		7
Commercial Mortgage Loans [Member] | Troubled Debt Restructurings Other [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	12,655	[3]	20,048	[4]
Commercial And Industrial Loan [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	171,926		91,951
Commercial And Industrial Loan [Member] | Troubled Debt Restructurings Interest Rate Below Market [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	7,533		12,099
Commercial And Industrial Loan [Member] | Troubled Debt Restructurings Maturity Or Term Extension [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	80,642		11,341
Commercial And Industrial Loan [Member] | Troubled Debt Restructurings Combination Of Reduction In Interest Rate And Extension Of Maturity [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	31,553		12,835
Commercial And Industrial Loan [Member] | Troubled Debt Restructurings Forgiveness Of Principal And Interest [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	3,074		3,122
Commercial And Industrial Loan [Member] | Troubled Debt Restructurings Other [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	49,124	[3]	52,554	[4]
Consumer Auto Loans [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	16,991		14,122
Consumer Auto Loans [Member] | Troubled Debt Restructurings Interest Rate Below Market [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	0		0
Consumer Auto Loans [Member] | Troubled Debt Restructurings Maturity Or Term Extension [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	380		706
Consumer Auto Loans [Member] | Troubled Debt Restructurings Combination Of Reduction In Interest Rate And Extension Of Maturity [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	10,363		8,350
Consumer Auto Loans [Member] | Troubled Debt Restructurings Forgiveness Of Principal And Interest [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	0		0
Consumer Auto Loans [Member] | Troubled Debt Restructurings Other [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	6,248	[3]	5,066	[4]
Finance Leases [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	2,181		2,358
Finance Leases [Member] | Troubled Debt Restructurings Interest Rate Below Market [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	0		0
Finance Leases [Member] | Troubled Debt Restructurings Maturity Or Term Extension [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	376		1,286
Finance Leases [Member] | Troubled Debt Restructurings Combination Of Reduction In Interest Rate And Extension Of Maturity [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	1,805		1,072
Finance Leases [Member] | Troubled Debt Restructurings Forgiveness Of Principal And Interest [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	0		0
Finance Leases [Member] | Troubled Debt Restructurings Other [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	0	[3]	0	[4]
Other Consumer Loans [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	13,307		10,864
Other Consumer Loans [Member] | Troubled Debt Restructurings Interest Rate Below Market [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	37		227
Other Consumer Loans [Member] | Troubled Debt Restructurings Maturity Or Term Extension [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	129		256
Other Consumer Loans [Member] | Troubled Debt Restructurings Combination Of Reduction In Interest Rate And Extension Of Maturity [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	10,812		8,638
Other Consumer Loans [Member] | Troubled Debt Restructurings Forgiveness Of Principal And Interest [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	443		0
Other Consumer Loans [Member] | Troubled Debt Restructurings Other [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	1,886	[3]	1,743	[4]
Commercial Construction [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment			3,924
Commercial Construction [Member] | Troubled Debt Restructurings Interest Rate Below Market [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment			0
Commercial Construction [Member] | Troubled Debt Restructurings Maturity Or Term Extension [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment			0
Commercial Construction [Member] | Troubled Debt Restructurings Combination Of Reduction In Interest Rate And Extension Of Maturity [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment			3,924
Commercial Construction [Member] | Troubled Debt Restructurings Forgiveness Of Principal And Interest [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment			0
Commercial Construction [Member] | Troubled Debt Restructurings Other [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment			0	[4]
Residential Construction [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	10,037		10,894
Residential Construction [Member] | Troubled Debt Restructurings Interest Rate Below Market [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	6,154		6,054
Residential Construction [Member] | Troubled Debt Restructurings Maturity Or Term Extension [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	337		160
Residential Construction [Member] | Troubled Debt Restructurings Combination Of Reduction In Interest Rate And Extension Of Maturity [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	3,112		3,173
Residential Construction [Member] | Troubled Debt Restructurings Forgiveness Of Principal And Interest [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	0		994
Residential Construction [Member] | Troubled Debt Restructurings Other [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	434	[3]	513	[4]
Land Construction [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	2,470		5,325
Land Construction [Member] | Troubled Debt Restructurings Interest Rate Below Market [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	0		878
Land Construction [Member] | Troubled Debt Restructurings Maturity Or Term Extension [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	202		2,012
Land Construction [Member] | Troubled Debt Restructurings Combination Of Reduction In Interest Rate And Extension Of Maturity [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	1,732		1,760
Land Construction [Member] | Troubled Debt Restructurings Forgiveness Of Principal And Interest [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	0		0
Land Construction [Member] | Troubled Debt Restructurings Other [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	$ 536	[3]	$ 675	[4]

[1] Excludes TDR held for sale amounting to $45.7 million as of December 31, 2014.

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

[3] Other concessions granted by the Corporation include deferral of principal and/or interest payments for a period longer than what would be considered insignificant, payment plans under judicial stipulation, or a combination of the concessions listed in the table.

[4] Other concessions granted by the Corporation include deferral of principal and/or interest payments for a period longer than what would be considered insignificant, payment plans under judicial stipulation, or a combination of the concessions listed in the table above.