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LOANS - Summary of Loan Portfolio by Category (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans $ 4,834,427 $ 4,805,094 $ 4,577,628  
Deferred fees, net 7,829 7,991    
Allowance for loan losses 40,810 40,599 39,826 $ 39,751
Net loans 4,805,758 4,776,318    
Reverse mortgage, fair value 20,000 19,800 22,500  
Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 582,722 558,493 464,898  
Allowance for loan losses 8,188 7,895 6,241 6,012
Commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 1,489,563 1,464,554    
Owner-occupied commercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 1,080,662 1,079,247 1,092,292  
Allowance for loan losses 5,359 5,422 6,030 6,588
Commercial mortgages        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 1,164,424 1,187,705 1,165,556  
Allowance for loan losses 6,617 5,891 8,335 8,915
Construction        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 289,943 281,608 255,760  
Allowance for loan losses 2,864 2,861 $ 2,961 $ 2,838
Residential        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 247,083 253,301    
Financing Receivable Portfolio Segment, Including Reverse Mortgages        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans $ 4,854,397 $ 4,824,908