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Loans - Summary of Loan Portfolio by Category (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans $ 4,605,771   $ 4,469,216 $ 3,847,515    
Deferred fees, net 7,684   7,673      
Allowance for loan losses 40,005 $ 39,826 39,751 37,746 $ 37,556 $ 37,089
Net loans 4,579,715   4,444,375      
Reverse mortgage, fair value 21,600   22,600 25,300    
Consumer            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans 492,817   450,029 374,634    
Allowance for loan losses 7,148 6,241 6,012 5,826 5,954 5,964
Commercial and industrial            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans 1,323,664   1,287,731      
Owner-occupied commercial            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans 1,109,876   1,078,162 938,330    
Allowance for loan losses 5,816 6,030 6,588 6,723 6,702 6,670
Commercial mortgages            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans 1,147,006   1,163,554 990,245    
Allowance for loan losses 7,335 8,335 8,915 8,135 6,516 6,487
Construction            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans 279,806   222,712 199,039    
Allowance for loan losses 3,432 $ 2,961 2,838 $ 3,308 $ 3,609 $ 3,521
Residential            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans 274,235   289,611      
Financing Receivable Portfolio Segment, Including Reverse Mortgages            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans $ 4,627,404   $ 4,491,799