LOAN PORTFOLIO - Credit Risk Payment Activity (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013		Sep. 30, 2013
Financing Receivable Recorded Investment [Line Items]
Loans And Leases Receivable Gross Carrying Amount	$ 9,315,402		$ 9,636,170		$ 9,508,634
Auto loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans And Leases Receivable Gross Carrying Amount	1,094,634		1,112,320
Finance Leases [Member]
Financing Receivable Recorded Investment [Line Items]
Loans And Leases Receivable Gross Carrying Amount	236,115		245,323
Residential Real Estate [Member] | Fhava Guaranteed Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans And Leases Receivable Gross Carrying Amount	154,310	[1]	195,226	[2]
Residential Real Estate [Member] | Other Residential Mortgage Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans And Leases Receivable Gross Carrying Amount	2,665,338		2,353,782
Residential Real Estate [Member] | Performing Financing Receivable [Member] | Fhava Guaranteed Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans And Leases Receivable Gross Carrying Amount	154,310	[1]	195,226	[2]
Residential Real Estate [Member] | Performing Financing Receivable [Member] | Other Residential Mortgage Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans And Leases Receivable Gross Carrying Amount	2,380,778		2,192,341
Residential Real Estate [Member] | Purchased Credit Impaired [Member] | Fhava Guaranteed Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans And Leases Receivable Gross Carrying Amount	0	[1],[3]	0	[2],[3]
Residential Real Estate [Member] | Purchased Credit Impaired [Member] | Other Residential Mortgage Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans And Leases Receivable Gross Carrying Amount	99,535	[3]	0	[3]
Residential Real Estate [Member] | Nonperforming Financing Receivable [Member] | Fhava Guaranteed Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans And Leases Receivable Gross Carrying Amount	0	[1]	0	[2]
Residential Real Estate [Member] | Nonperforming Financing Receivable [Member] | Other Residential Mortgage Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans And Leases Receivable Gross Carrying Amount	185,025		161,441
Consumer [Member] | Auto loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans And Leases Receivable Gross Carrying Amount	1,094,634		1,112,320
Consumer [Member] | Finance Leases [Member]
Financing Receivable Recorded Investment [Line Items]
Loans And Leases Receivable Gross Carrying Amount	236,115		245,323
Consumer [Member] | Other Consumer Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans And Leases Receivable Gross Carrying Amount	695,838		708,876
Consumer [Member] | Performing Financing Receivable [Member] | Auto loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans And Leases Receivable Gross Carrying Amount	1,071,709		1,091,004
Consumer [Member] | Performing Financing Receivable [Member] | Finance Leases [Member]
Financing Receivable Recorded Investment [Line Items]
Loans And Leases Receivable Gross Carrying Amount	231,614		242,241
Consumer [Member] | Performing Financing Receivable [Member] | Other Consumer Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans And Leases Receivable Gross Carrying Amount	678,408		688,181
Consumer [Member] | Purchased Credit Impaired [Member] | Auto loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans And Leases Receivable Gross Carrying Amount	0	[3]	0	[3]
Consumer [Member] | Purchased Credit Impaired [Member] | Finance Leases [Member]
Financing Receivable Recorded Investment [Line Items]
Loans And Leases Receivable Gross Carrying Amount	0	[3]	0	[3]
Consumer [Member] | Purchased Credit Impaired [Member] | Other Consumer Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans And Leases Receivable Gross Carrying Amount	1,360	[3]	4,791	[3]
Consumer [Member] | Nonperforming Financing Receivable [Member] | Auto loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans And Leases Receivable Gross Carrying Amount	22,925		21,316
Consumer [Member] | Nonperforming Financing Receivable [Member] | Finance Leases [Member]
Financing Receivable Recorded Investment [Line Items]
Loans And Leases Receivable Gross Carrying Amount	4,501		3,082
Consumer [Member] | Nonperforming Financing Receivable [Member] | Other Consumer Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans And Leases Receivable Gross Carrying Amount	$ 16,070		$ 15,904

[1]  It is the Corporation's policy to report delinquent residential mortgage loans insured by the FHA or guaranteed by the VA as past due loans 90 days and still accruing as opposed to non-performing loans since the principal repayment is insured. These balances include $41.4 million of residential mortgage loans insured by the FHA or guaranteed by the VA that are over 18 months delinquent, and are no longer accruing interest as of September 30, 2014.

[2]  It is the Corporation's policy to report delinquent residential mortgage loans insured by the FHA or guaranteed by the VA as past due loans 90 days and still accruing as opposed to non-performing loans since the principal repayment is insured. These balances include $37.0 million of residential mortgage loans insured by the FHA or guaranteed by the VA that are over 18 months delinquent, and are no longer accruing interest as of December 31, 2013.

[3]  PCI loans are excluded from non-performing statistics due to the application of the accretion method, under which these loans will accrete interest income over the remaining life of the loans using estimated cash flow analysis.