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Loans - Summary of Loan Portfolio by Category (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans $ 4,894,257 $ 4,805,094 $ 4,469,216  
Deferred fees, net 7,348 7,991    
Allowance for loan losses 39,539 40,599 39,751 $ 37,089
Loans, net 4,863,919 4,776,318    
Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 680,939 558,493 450,029  
Allowance for loan losses 8,325 7,895 6,012 5,964
Financing Receivable Portfolio Segment, Including Reverse Mortgages        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 4,910,806 4,824,908    
Residential        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 218,099 253,301    
Commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 1,472,489 1,464,554    
Owner-occupied commercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 1,059,974 1,079,247 1,078,162  
Allowance for loan losses 5,057 5,422 6,588 6,670
Commercial mortgages        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 1,162,739 1,187,705 1,163,554  
Allowance for loan losses 6,806 5,891 8,915 6,487
Construction        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 316,566 281,608 222,712  
Allowance for loan losses $ 3,712 $ 2,861 $ 2,838 $ 3,521