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Credit Risk Profile Based on Payment Activity - Originated and Non-PCI Loans (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 2015
Financing Receivable, Recorded Investment [Line Items]      
Credit Risk Profile Based on Payment Activity $ 10,083,266 $ 9,430,761 $ 8,916,128
Real estate - residential [Member] | Prime [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Credit Risk Profile Based on Payment Activity 478,638 492,227  
Consumer [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Credit Risk Profile Based on Payment Activity 395,216   380,938
Leases [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Credit Risk Profile Based on Payment Activity 36,577 41,857 $ 40,073
Commercial - credit card [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Credit Risk Profile Based on Payment Activity 145,359 125,361  
Real estate - HELOC [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Credit Risk Profile Based on Payment Activity 741,703 729,963  
Credit card [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Credit Risk Profile Based on Payment Activity 270,353 291,570  
Other [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Credit Risk Profile Based on Payment Activity 124,863 154,777  
Originated and Non-PCI Loans [Member] | Real estate - residential [Member] | Prime [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Credit Risk Profile Based on Payment Activity 478,638 492,227  
Originated and Non-PCI Loans [Member] | Leases [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Credit Risk Profile Based on Payment Activity 36,577 41,857  
Originated and Non-PCI Loans [Member] | Commercial - credit card [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Credit Risk Profile Based on Payment Activity 145,359 125,361  
Originated and Non-PCI Loans [Member] | Real estate - HELOC [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Credit Risk Profile Based on Payment Activity 741,703 729,963  
Originated and Non-PCI Loans [Member] | Credit card [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Credit Risk Profile Based on Payment Activity 270,353 291,570  
Originated and Non-PCI Loans [Member] | Other [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Credit Risk Profile Based on Payment Activity 123,633 154,777  
Originated and Non-PCI Loans [Member] | Performing [Member] | Real estate - residential [Member] | Prime [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Credit Risk Profile Based on Payment Activity 478,101 491,427  
Originated and Non-PCI Loans [Member] | Performing [Member] | Leases [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Credit Risk Profile Based on Payment Activity 36,577 41,857  
Originated and Non-PCI Loans [Member] | Performing [Member] | Commercial - credit card [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Credit Risk Profile Based on Payment Activity 145,340 125,348  
Originated and Non-PCI Loans [Member] | Performing [Member] | Real estate - HELOC [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Credit Risk Profile Based on Payment Activity 738,314 726,439  
Originated and Non-PCI Loans [Member] | Performing [Member] | Credit card [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Credit Risk Profile Based on Payment Activity 270,040 291,102  
Originated and Non-PCI Loans [Member] | Performing [Member] | Other [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Credit Risk Profile Based on Payment Activity 120,982 152,180  
Originated and Non-PCI Loans [Member] | Non-performing [Member] | Real estate - residential [Member] | Prime [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Credit Risk Profile Based on Payment Activity 537 800  
Originated and Non-PCI Loans [Member] | Non-performing [Member] | Commercial - credit card [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Credit Risk Profile Based on Payment Activity 19 13  
Originated and Non-PCI Loans [Member] | Non-performing [Member] | Real estate - HELOC [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Credit Risk Profile Based on Payment Activity 3,389 3,524  
Originated and Non-PCI Loans [Member] | Non-performing [Member] | Credit card [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Credit Risk Profile Based on Payment Activity 313 468  
Originated and Non-PCI Loans [Member] | Non-performing [Member] | Other [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Credit Risk Profile Based on Payment Activity $ 2,651 $ 2,597