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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, 2019
Dec. 31, 2018
Sep. 30, 2018
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Finance receivable recorded investment, Performing $ 11,853,179 $ 12,037,323  
Total loans and leases outstanding 12,017,648 12,243,892 $ 11,292,659
Residential Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans and leases outstanding 2,236,623 2,248,404 $ 2,166,203
Residential Real Estate [Member] | Performing Financing Receivable [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Finance receivable recorded investment, Performing 2,215,864 2,223,450  
Residential Real Estate [Member] | Nonperforming Financing Receivable [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Finance receivable recorded investment, Nonperforming 20,759 24,954  
Consumer Home Equity [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans and leases outstanding 555,905 589,322  
Consumer Home Equity [Member] | Performing Financing Receivable [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Finance receivable recorded investment, Performing 551,129 586,235  
Consumer Home Equity [Member] | Nonperforming Financing Receivable [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Finance receivable recorded investment, Nonperforming 4,776 3,087  
Consumer Auto [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans and leases outstanding 1,005,535 1,059,633  
Consumer Auto [Member] | Performing Financing Receivable [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Finance receivable recorded investment, Performing 1,002,091 1,057,038  
Consumer Auto [Member] | Nonperforming Financing Receivable [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Finance receivable recorded investment, Nonperforming 3,444 2,595  
Consumer - Other [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans and leases outstanding 156,903 154,712  
Consumer - Other [Member] | Performing Financing Receivable [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Finance receivable recorded investment, Performing 155,707 153,113  
Consumer - Other [Member] | Nonperforming Financing Receivable [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Finance receivable recorded investment, Nonperforming $ 1,196 $ 1,599