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Loans and Allowance for Credit Losses - Schedule of Composition of Loans (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]      
Loans by lending classification $ 6,847,898 $ 6,318,201 $ 6,242,435
Allowance for loan losses (49,515) (44,297) (44,693)
Allowance for loan losses - covered loans (1,711) (3,552) (3,586)
Net loans 6,796,672 6,270,352 $ 6,194,156
Commercial [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Loans by lending classification 1,740,394 1,629,600  
Residential Real Estate [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Loans by lending classification 1,640,289 1,519,156  
Consumer Loan [Member] | Consumer Credit - Heloc [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Loans by lending classification 362,055 360,320  
Construction [Member] | Commercial Real Estate [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Loans by lending classification 164,247 134,552  
Other [Member] | Commercial Real Estate [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Loans by lending classification 1,681,642 1,576,558  
Other [Member] | Consumer Loan [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Loans by lending classification 140,243 103,338  
Consumer Credit - Auto [Member] | Consumer Loan [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Loans by lending classification 1,004,989 846,969  
Covered Loans [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Loans by lending classification $ 114,039 $ 147,708