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Loans and Allowance for Credit Losses - Schedule of Recorded Investment in Residential and Consumer Loans Based on Payment Activity (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Finance receivable recorded investment $ 1,893,163 $ 1,543,768 $ 1,464,541
Residential real estate 2,099,770 1,644,614 $ 1,622,819
Consumer Heloc [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Finance receivable recorded investment 473,550 413,294  
Consumer Heloc [Member] | Performing Financing Receivable [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Finance receivable recorded investment, Performing 469,711 410,243  
Consumer Heloc [Member] | Nonperforming Financing Receivable [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Finance receivable recorded investment, Nonperforming 3,839 3,051  
Consumer Auto [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Finance receivable recorded investment 1,145,198 1,050,336  
Consumer Auto [Member] | Performing Financing Receivable [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Finance receivable recorded investment, Performing 1,143,932 1,048,763  
Consumer Auto [Member] | Nonperforming Financing Receivable [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Finance receivable recorded investment, Nonperforming 1,266 1,573  
Consumer - Other [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Finance receivable recorded investment 274,415 139,528  
Consumer - Other [Member] | Performing Financing Receivable [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Finance receivable recorded investment, Performing 266,649 138,031  
Consumer - Other [Member] | Nonperforming Financing Receivable [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Finance receivable recorded investment, Nonperforming 7,766 1,497  
Residential [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Residential real estate 2,099,770 1,661,335  
Residential [Member] | Performing Financing Receivable [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Finance receivable recorded investment, Performing 2,082,585 1,645,293  
Residential [Member] | Nonperforming Financing Receivable [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Finance receivable recorded investment, Nonperforming $ 17,185 $ 16,042