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Loans - Summary of Loan Portfolio by Category (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans $ 3,343,505   $ 3,202,498 $ 3,041,477    
Deferred fees, net 7,189   6,420      
Allowance for loan losses 40,845 $ 39,507 39,426 41,381 $ 41,328 $ 41,244
Net loans 3,295,471   3,156,652      
Commercial [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans 936,765   920,072 857,354    
Allowance for loan losses 14,512 13,048 12,837 13,346 12,404 12,751
Owner Occupied Commercial [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans 793,062   788,598 778,257    
Allowance for loan losses 6,733 7,039 6,643 7,986 8,789 7,638
Consumer [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans 328,884   327,543 312,520    
Allowance for loan losses 5,788 $ 6,026 6,041 $ 6,299 $ 6,249 $ 6,494
Construction Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans 201,845   142,497      
Commercial Mortgage [Member] | Real Estate Mortgage Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans 870,152   805,459      
Residential (1-4 Family) [Member] | Real Estate Mortgage Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans $ 212,797   $ 218,329