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Loans and Allowance for Loan Losses - Schedule of Recorded Investment in Residential and Consumer Loans Based on Payment Activity (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Finance receivable recorded investment, Performing $ 11,103,231 $ 10,951,187  
Residential real estate 2,166,203 2,167,053 $ 2,119,120
Finance receivable recorded investment 1,695,625 1,879,247 $ 1,859,739
Residential [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Residential real estate 2,166,203 2,167,053  
Residential [Member] | Performing Financing Receivable [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Finance receivable recorded investment, Performing 2,142,768 2,144,882  
Residential [Member] | Nonperforming Financing Receivable [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Finance receivable recorded investment, Nonperforming 23,435 22,171  
Consumer Home Equity [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Finance receivable recorded investment 498,325 507,507  
Consumer Home Equity [Member] | Performing Financing Receivable [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Finance receivable recorded investment, Performing 494,510 502,322  
Consumer Home Equity [Member] | Nonperforming Financing Receivable [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Finance receivable recorded investment, Nonperforming 3,815 5,185  
Consumer Auto [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Finance receivable recorded investment 1,058,977 1,148,672  
Consumer Auto [Member] | Performing Financing Receivable [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Finance receivable recorded investment, Performing 1,056,681 1,145,977  
Consumer Auto [Member] | Nonperforming Financing Receivable [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Finance receivable recorded investment, Nonperforming 2,296 2,695  
Consumer - Other [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Finance receivable recorded investment 138,323 223,068  
Consumer - Other [Member] | Performing Financing Receivable [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Finance receivable recorded investment, Performing 136,801 217,819  
Consumer - Other [Member] | Nonperforming Financing Receivable [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Finance receivable recorded investment, Nonperforming $ 1,522 $ 5,249