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LOANS AND ALLOWANCE FOR LOAN LOSSES - Summary of Ending Loan Balance Individually Evaluated for Impairment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Loans allocated by:        
Individually evaluated for impairment $ 11,026 $ 7,973    
Collectively evaluated for impairment 998,986 875,418    
Total Loans 1,010,012 883,391    
Allowance for loan losses allocated by:        
Individually evaluated for impairment 51 43    
Collectively evaluated for impairment 12,745 12,732    
Allowance for loan losses, Total 12,796 12,775 $ 13,568 $ 14,747
Commercial        
Loans allocated by:        
Individually evaluated for impairment 6,690 3,052    
Collectively evaluated for impairment 674,935 598,769    
Total Loans 681,625 601,821    
Allowance for loan losses allocated by:        
Individually evaluated for impairment 0 0    
Collectively evaluated for impairment 8,710 9,238    
Allowance for loan losses, Total 8,710 9,238    
Consumer        
Loans allocated by:        
Individually evaluated for impairment 4,336 4,921    
Collectively evaluated for impairment 324,051 276,649    
Total Loans 328,387 281,570    
Allowance for loan losses allocated by:        
Individually evaluated for impairment 51 43    
Collectively evaluated for impairment 3,560 3,080    
Allowance for loan losses, Total 3,611 3,123    
Unallocated        
Loans allocated by:        
Individually evaluated for impairment 0 0    
Collectively evaluated for impairment 0 0    
Total Loans 0 0    
Allowance for loan losses allocated by:        
Individually evaluated for impairment 0 0    
Collectively evaluated for impairment 475 414    
Allowance for loan losses, Total 475 414    
Commercial Real Estate | Commercial        
Loans allocated by:        
Individually evaluated for impairment 5,848 2,457    
Collectively evaluated for impairment 487,068 426,410    
Total Loans 492,916 428,867    
Allowance for loan losses allocated by:        
Individually evaluated for impairment 0 0    
Collectively evaluated for impairment 6,763 7,530    
Allowance for loan losses, Total 6,763 7,530    
Acquisition and Development | Commercial        
Loans allocated by:        
Individually evaluated for impairment 492 1    
Collectively evaluated for impairment 30,489 30,747    
Total Loans 30,981 30,748    
Allowance for loan losses allocated by:        
Individually evaluated for impairment 0 0    
Collectively evaluated for impairment 417 580    
Allowance for loan losses, Total 417 580    
Commercial and Industrial        
Loans allocated by:        
Total Loans 115,663 88,465    
Commercial and Industrial | Commercial        
Loans allocated by:        
Individually evaluated for impairment 350 594    
Collectively evaluated for impairment 115,313 87,871    
Total Loans 115,663 88,465    
Allowance for loan losses allocated by:        
Individually evaluated for impairment 0 0    
Collectively evaluated for impairment 1,446 1,074    
Allowance for loan losses, Total 1,446 1,074    
Municipal        
Loans allocated by:        
Total Loans 42,065 53,741    
Municipal | Commercial        
Loans allocated by:        
Individually evaluated for impairment 0 0    
Collectively evaluated for impairment 42,065 53,741    
Total Loans 42,065 53,741    
Allowance for loan losses allocated by:        
Individually evaluated for impairment 0 0    
Collectively evaluated for impairment 84 54    
Allowance for loan losses, Total 84 54    
Residential Mortgage | Consumer        
Loans allocated by:        
Individually evaluated for impairment 4,325 4,915    
Collectively evaluated for impairment 302,160 269,537    
Total Loans 306,485 274,452    
Allowance for loan losses allocated by:        
Individually evaluated for impairment 42 43    
Collectively evaluated for impairment 3,358 2,936    
Allowance for loan losses, Total 3,400 2,979    
Installment and other loans        
Loans allocated by:        
Total Loans 21,902 7,118    
Installment and other loans | Consumer        
Loans allocated by:        
Individually evaluated for impairment 11 6    
Collectively evaluated for impairment 21,891 7,112    
Total Loans 21,902 7,118    
Allowance for loan losses allocated by:        
Individually evaluated for impairment 9 0    
Collectively evaluated for impairment 202 144    
Allowance for loan losses, Total $ 211 $ 144