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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
Dec. 31, 2018
Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Finance receivable recorded investment, Performing $ 12,037,323 $ 10,951,187
Residential [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Residential real estate 2,248,404 2,167,053
Residential [Member] | Performing Financing Receivable [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Finance receivable recorded investment, Performing 2,223,450 2,144,882
Residential [Member] | Nonperforming Financing Receivable [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Finance receivable recorded investment, Nonperforming 24,954 22,171
Consumer Home Equity [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Finance receivable recorded investment 589,322 507,507
Consumer Home Equity [Member] | Performing Financing Receivable [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Finance receivable recorded investment, Performing 586,235 502,322
Consumer Home Equity [Member] | Nonperforming Financing Receivable [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Finance receivable recorded investment, Nonperforming 3,087 5,185
Consumer Auto [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Finance receivable recorded investment 1,059,633 1,148,672
Consumer Auto [Member] | Performing Financing Receivable [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Finance receivable recorded investment, Performing 1,057,038 1,145,977
Consumer Auto [Member] | Nonperforming Financing Receivable [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Finance receivable recorded investment, Nonperforming 2,595 2,695
Consumer - Other [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Finance receivable recorded investment 154,712 223,068
Consumer - Other [Member] | Performing Financing Receivable [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Finance receivable recorded investment, Performing 153,113 217,819
Consumer - Other [Member] | Nonperforming Financing Receivable [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Finance receivable recorded investment, Nonperforming $ 1,599 $ 5,249