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Loans - Summary of Loan Portfolio by Category (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Jun. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans $ 3,367,991   $ 3,202,498      
Deferred fees, net 7,559   6,420      
Allowance for loan losses 36,412 $ 40,845 39,426 $ 39,484 $ 41,381 $ 41,244
Net loans 3,324,020   3,156,652      
Commercial And Industrial [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans 938,060   920,072      
Owner Occupied Commercial [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans 811,548   788,598 808,257    
Allowance for loan losses 6,685 6,733 6,643 8,245 7,986 7,638
Consumer [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans 341,210   327,543 325,786    
Allowance for loan losses 5,779 $ 5,788 6,041 $ 6,244 $ 6,299 $ 6,494
Construction Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans 203,161   142,497      
Commercial Mortgage [Member] | Real Estate Mortgage Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans 874,316   805,459      
Residential (1-4 Family) [Member] | Real Estate Mortgage Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans $ 199,696   $ 218,329