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Credit Risk Profile Based on Payment Activity - Originated and Non-PCI Loans (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Financing Receivable, Recorded Investment [Line Items]      
Credit Risk Profile Based on Payment Activity $ 10,757,236 $ 10,540,383 $ 9,699,631
Real estate - residential [Member] | Prime [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Credit Risk Profile Based on Payment Activity 578,993 548,350  
Consumer [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Credit Risk Profile Based on Payment Activity 355,209   387,529
Leases [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Credit Risk Profile Based on Payment Activity 38,683 39,532 $ 43,038
Commercial - credit card [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Credit Risk Profile Based on Payment Activity 155,091 146,735  
Real estate - HELOC [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Credit Risk Profile Based on Payment Activity 688,407 711,794  
Credit card [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Credit Risk Profile Based on Payment Activity 246,929 270,098  
Other [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Credit Risk Profile Based on Payment Activity 108,280 139,562  
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 578,993 548,350  
Originated and Non-PCI Loans [Member] | Leases [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Credit Risk Profile Based on Payment Activity 38,683 39,532  
Originated and Non-PCI Loans [Member] | Commercial - credit card [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Credit Risk Profile Based on Payment Activity 155,091 146,735  
Originated and Non-PCI Loans [Member] | Real estate - HELOC [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Credit Risk Profile Based on Payment Activity 688,407 711,794  
Originated and Non-PCI Loans [Member] | Credit card [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Credit Risk Profile Based on Payment Activity 246,929 270,098  
Originated and Non-PCI Loans [Member] | Other [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Credit Risk Profile Based on Payment Activity 108,280 138,762  
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 577,672 547,006  
Originated and Non-PCI Loans [Member] | Performing [Member] | Leases [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Credit Risk Profile Based on Payment Activity 38,683 39,532  
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 155,086 146,727  
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 684,534 707,058  
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 246,525 269,623  
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 108,247 127,447  
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 1,321 1,344  
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 5 8  
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 3,873 4,736  
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 404 475  
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 $ 33 $ 11,315