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Loans - Summary of Loan Portfolio by Category (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans $ 3,803,713 $ 3,774,639 $ 3,234,959  
Deferred fees, net 8,428 8,500    
Allowance for loan losses 37,556 37,089 39,507 $ 39,426
Net loans 3,757,729 3,729,050    
Consumer Loan Commitments [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 359,656 360,249 324,232  
Allowance for loan losses 5,954 5,964 6,026 6,041
Commercial And Industrial [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 1,083,121 1,061,597    
Owner- Occupied Commercial [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 895,457 880,643 797,400  
Allowance for loan losses 6,702 6,670 7,039 6,643
Commercial Mortgages [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 987,066 966,698 820,836  
Allowance for loan losses 6,516 6,487 6,524 7,266
Construction Loan Commitments [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 227,348 245,773 153,224  
Allowance for loan losses 3,609 3,521 $ 2,952 $ 2,596
Residential (1-4 Family) [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans $ 251,065 $ 259,679