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Loans - Summary of Loan Portfolio by Category (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans $ 4,577,628 $ 4,469,216 $ 3,803,713  
Deferred fees, net 8,156 7,673    
Allowance for loan losses 39,826 39,751 37,556 $ 37,089
Net loans 4,552,151 4,444,375    
Reverse mortgage, fair value 22,500 22,600 24,700  
Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 464,898 450,029 359,656  
Allowance for loan losses 6,241 6,012 5,954 5,964
Commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 1,339,867 1,287,731    
Owner-occupied commercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 1,092,292 1,078,162 895,457  
Allowance for loan losses 6,030 6,588 6,702 6,670
Commercial mortgages        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 1,165,556 1,163,554 987,066  
Allowance for loan losses 8,335 8,915 6,516 6,487
Construction        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 255,760 222,712 227,348  
Allowance for loan losses 2,961 2,838 $ 3,609 $ 3,521
Residential        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 281,760 289,611    
Financing Receivable Portfolio Segment, Including Reverse Mortgages        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans $ 4,600,133 $ 4,491,799