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Credit Risk Profile Based on Payment Activity - Originated and Non-PCI Loans (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Financing Receivable, Recorded Investment [Line Items]      
Credit Risk Profile Based on Payment Activity $ 11,631,628 $ 11,280,513 $ 10,848,578
Consumer [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Credit Risk Profile Based on Payment Activity 365,599   368,029
Leases [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Credit Risk Profile Based on Payment Activity 19,998 23,967 $ 27,804
Commercial - credit card [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Credit Risk Profile Based on Payment Activity 187,091 172,291  
Real estate - HELOC [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Credit Risk Profile Based on Payment Activity 578,904 648,379  
Credit card [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Credit Risk Profile Based on Payment Activity 227,325 252,697  
Other [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Credit Risk Profile Based on Payment Activity 138,274 151,783  
Originated and Non-PCI Loans [Member] | Real estate - residential [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Credit Risk Profile Based on Payment Activity 687,264 638,591  
Originated and Non-PCI Loans [Member] | Leases [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Credit Risk Profile Based on Payment Activity 19,998 23,967  
Originated and Non-PCI Loans [Member] | Commercial - credit card [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Credit Risk Profile Based on Payment Activity 187,091 172,291  
Originated and Non-PCI Loans [Member] | Real estate - HELOC [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Credit Risk Profile Based on Payment Activity 578,904 648,379  
Originated and Non-PCI Loans [Member] | Credit card [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Credit Risk Profile Based on Payment Activity 227,325 252,697  
Originated and Non-PCI Loans [Member] | Other [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Credit Risk Profile Based on Payment Activity 138,274 151,783  
Originated and Non-PCI Loans [Member] | Performing [Member] | Real estate - residential [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Credit Risk Profile Based on Payment Activity 686,581 637,662  
Originated and Non-PCI Loans [Member] | Performing [Member] | Leases [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Credit Risk Profile Based on Payment Activity 19,998 23,967  
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 187,091 172,291  
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 575,815 645,366  
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 226,918 252,385  
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 138,236 151,747  
Originated and Non-PCI Loans [Member] | Non-performing [Member] | Real estate - residential [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Credit Risk Profile Based on Payment Activity 683 929  
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 3,089 3,013  
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 407 312  
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 $ 38 $ 36