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Loans - Summary of Loan Portfolio by Category (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans $ 3,847,515   $ 3,774,639 $ 3,343,505    
Deferred fees, net 8,529   8,500      
Allowance for loan losses 37,746 $ 37,556 37,089 40,845 $ 39,507 $ 39,426
Net loans 3,801,240   3,729,050      
Consumer Loan Commitments [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans 374,634   360,249 328,884    
Allowance for loan losses 5,826 5,954 5,964 5,788 6,026 6,041
Commercial And Industrial [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans 1,108,610   1,061,597      
Owner- Occupied Commercial [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans 938,330   880,643 793,062    
Allowance for loan losses 6,723 6,702 6,670 6,733 7,039 6,643
Commercial Mortgages [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans 990,245   966,698 870,152    
Allowance for loan losses 8,135 6,516 6,487 6,831 6,524 7,266
Construction [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans 199,039   245,773 201,845    
Allowance for loan losses 3,308 $ 3,609 3,521 $ 3,313 $ 2,952 $ 2,596
Residential (1-4 Family) [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans $ 236,657   $ 259,679