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Credit Risk Profile Based on Payment Activity - Originated and Non-PCI Loans (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Financing Receivable, Recorded Investment [Line Items]      
Credit Risk Profile Based on Payment Activity $ 10,997,028 $ 10,540,383 $ 10,293,494
Real estate - residential [Member] | Prime [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Credit Risk Profile Based on Payment Activity 614,596 548,350  
Consumer [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Credit Risk Profile Based on Payment Activity 422,450   387,371
Leases [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Credit Risk Profile Based on Payment Activity 24,445 39,532 $ 31,529
Commercial - credit card [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Credit Risk Profile Based on Payment Activity 174,782 146,735  
Real estate - HELOC [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Credit Risk Profile Based on Payment Activity 661,991 711,794  
Credit card [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Credit Risk Profile Based on Payment Activity 243,735 270,098  
Other [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Credit Risk Profile Based on Payment Activity 178,715 139,562  
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 614,596 548,350  
Originated and Non-PCI Loans [Member] | Leases [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Credit Risk Profile Based on Payment Activity 24,445 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 174,782 146,735  
Originated and Non-PCI Loans [Member] | Real estate - HELOC [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Credit Risk Profile Based on Payment Activity 661,991 711,794  
Originated and Non-PCI Loans [Member] | Credit card [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Credit Risk Profile Based on Payment Activity 243,735 270,098  
Originated and Non-PCI Loans [Member] | Other [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Credit Risk Profile Based on Payment Activity 178,715 138,762  
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 613,851 547,006  
Originated and Non-PCI Loans [Member] | Performing [Member] | Leases [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Credit Risk Profile Based on Payment Activity 24,445 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 174,782 146,727  
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 658,853 707,058  
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 243,378 269,623  
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 178,693 127,447  
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 745 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   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 3,138 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 357 475  
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 $ 22 $ 11,315