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LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES - Summary of Ending Loan Balances Evaluated for Impairment and Related Allowance for Loan Losses Allocation (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]            
Loans, Individually evaluated for impairment $ 14,453   $ 17,350      
Loans, Collectively evaluated for impairment 832,608   764,363      
Total Loans 847,061   781,713      
Allowance for loan losses, Individually evaluated for impairment 874   289      
Allowance for loan losses, Collectively evaluated for impairment 12,976   13,279      
Allowance for loan losses, Total 13,850 $ 13,440 13,568 $ 13,537 $ 13,852 $ 14,747
Commercial and Industrial            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Total Loans 87,492   73,625      
Municipal            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Total Loans 54,241   57,511      
Installment and other loans            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Total Loans 7,212   7,521      
Commercial            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Loans, Individually evaluated for impairment 9,661   11,832      
Loans, Collectively evaluated for impairment 566,520   508,270      
Total Loans 576,181   520,102      
Allowance for loan losses, Individually evaluated for impairment 808   0      
Allowance for loan losses, Collectively evaluated for impairment 9,620   9,803      
Allowance for loan losses, Total 10,428 9,929 9,803 9,777 9,815 11,148
Commercial | Commercial Real Estate            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Loans, Individually evaluated for impairment 9,096   11,093      
Loans, Collectively evaluated for impairment 390,943   327,170      
Total Loans 400,039   338,263      
Allowance for loan losses, Individually evaluated for impairment 650   0      
Allowance for loan losses, Collectively evaluated for impairment 7,822   7,883      
Allowance for loan losses, Total 8,472 8,133 7,883 8,035 8,132 9,462
Commercial | Acquisition and Development            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Loans, Individually evaluated for impairment 2   5      
Loans, Collectively evaluated for impairment 34,407   50,698      
Total Loans 34,409   50,703      
Allowance for loan losses, Individually evaluated for impairment 0   0      
Allowance for loan losses, Collectively evaluated for impairment 676   850      
Allowance for loan losses, Total 676 587 850 640 720 697
Commercial | Commercial and Industrial            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Loans, Individually evaluated for impairment 563   734      
Loans, Collectively evaluated for impairment 86,929   72,891      
Total Loans 87,492   73,625      
Allowance for loan losses, Individually evaluated for impairment 158   0      
Allowance for loan losses, Collectively evaluated for impairment 1,068   1,012      
Allowance for loan losses, Total 1,226 1,148 1,012 985 844 806
Commercial | Municipal            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Loans, Individually evaluated for impairment 0   0      
Loans, Collectively evaluated for impairment 54,241   57,511      
Total Loans 54,241   57,511      
Allowance for loan losses, Individually evaluated for impairment 0   0      
Allowance for loan losses, Collectively evaluated for impairment 54   58      
Allowance for loan losses, Total 54 61 58 117 119 183
Consumer            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Loans, Individually evaluated for impairment 4,792   5,518      
Loans, Collectively evaluated for impairment 266,088   256,093      
Total Loans 270,880   261,611      
Allowance for loan losses, Individually evaluated for impairment 66   289      
Allowance for loan losses, Collectively evaluated for impairment 2,732   2,702      
Allowance for loan losses, Total 2,798 2,886 2,991 2,854 3,100 2,381
Consumer | Residential Mortgage            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Loans, Individually evaluated for impairment 4,783   5,501      
Loans, Collectively evaluated for impairment 258,885   248,589      
Total Loans 263,668   254,090      
Allowance for loan losses, Individually evaluated for impairment 64   281      
Allowance for loan losses, Collectively evaluated for impairment 2,562   2,589      
Allowance for loan losses, Total 2,626 2,706 2,870 2,676 2,918 2,262
Consumer | Installment and other loans            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Loans, Individually evaluated for impairment 9   17      
Loans, Collectively evaluated for impairment 7,203   7,504      
Total Loans 7,212   7,521      
Allowance for loan losses, Individually evaluated for impairment 2   8      
Allowance for loan losses, Collectively evaluated for impairment 170   113      
Allowance for loan losses, Total 172 180 121 178 182 119
Unallocated            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Loans, Individually evaluated for impairment 0   0      
Loans, Collectively evaluated for impairment 0   0      
Total Loans 0   0      
Allowance for loan losses, Individually evaluated for impairment 0   0      
Allowance for loan losses, Collectively evaluated for impairment 624   774      
Allowance for loan losses, Total $ 624 $ 625 $ 774 $ 906 $ 937 $ 1,218