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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
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Finance receivable recorded investment, Performing $ 11,876,517 $ 12,037,323  
Residential real estate 2,243,885 2,248,404 $ 2,158,532
Finance receivable recorded investment 1,758,682 1,803,667 $ 1,818,541
Residential [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Residential real estate 2,243,885 2,248,404  
Residential [Member] | Performing Financing Receivable [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Finance receivable recorded investment, Performing 2,218,094 2,223,450  
Residential [Member] | Nonperforming Financing Receivable [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Finance receivable recorded investment, Nonperforming 25,791 24,954  
Consumer Home Equity [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Finance receivable recorded investment 553,264 589,322  
Consumer Home Equity [Member] | Performing Financing Receivable [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Finance receivable recorded investment, Performing 548,501 586,235  
Consumer Home Equity [Member] | Nonperforming Financing Receivable [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Finance receivable recorded investment, Nonperforming 4,763 3,087  
Consumer Auto [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Finance receivable recorded investment 1,034,347 1,059,633  
Consumer Auto [Member] | Performing Financing Receivable [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Finance receivable recorded investment, Performing 1,031,049 1,057,038  
Consumer Auto [Member] | Nonperforming Financing Receivable [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Finance receivable recorded investment, Nonperforming 3,298 2,595  
Consumer - Other [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Finance receivable recorded investment 171,071 154,712  
Consumer - Other [Member] | Performing Financing Receivable [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Finance receivable recorded investment, Performing 170,046 153,113  
Consumer - Other [Member] | Nonperforming Financing Receivable [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Finance receivable recorded investment, Nonperforming $ 1,025 $ 1,599