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ALLOWANCE FOR LOAN LOSSES AND CREDIT QUALITY INFORMATION - Schedule of Residential and Consumer Credit Exposure (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans $ 4,834,427 $ 4,805,094 $ 4,577,628
Total 99.98% 100.00%  
Residential      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans $ 227,113 $ 233,487 259,255
Consumer      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 582,722 558,493 $ 464,898
Nonperforming | Residential      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 12,861 13,778  
Nonperforming | Consumer      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 7,677 7,588  
Performing | Residential      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 213,475 218,925  
Performing | Consumer      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans $ 574,796 $ 550,658  
Acquired impaired      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 1.00% 1.00%  
Acquired impaired | Residential      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans $ 777 $ 784  
Acquired impaired | Consumer      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 249 247  
Total Residential and Consumer      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans $ 809,835 $ 791,980  
Total 100.00% 100.00%  
Total Residential and Consumer | Nonperforming      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans $ 20,538 $ 21,366  
Total 3.00% 3.00%  
Total Residential and Consumer | Performing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans $ 788,271 $ 769,583  
Total 97.00% 97.00%  
Total Residential and Consumer | Acquired impaired      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans $ 1,026 $ 1,031  
Total 0.00% 0.00%