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LOANS AND ALLOWANCE FOR LOAN LOSSES - Schedule of Activity in Allowance for Loan Losses (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Activity in allowance for loan losses      
Balance, beginning of year $ 12,796 $ 12,775 $ 13,568
Provision for loan losses 800 1,000 250
Charge-offs (464) (1,266) (1,722)
Recoveries 882 287 679
Balance, end of year 14,014 12,796 12,775
Unallocated      
Activity in allowance for loan losses      
Balance, beginning of year 475 414 774
Provision for loan losses 95 61 (360)
Charge-offs 0 0 0
Recoveries 0 0 0
Balance, end of year 570 475 414
Commercial      
Activity in allowance for loan losses      
Balance, beginning of year 8,710 9,238 9,803
Provision for loan losses 177 234 (38)
Charge-offs (24) (920) (951)
Recoveries 584 158 424
Balance, end of year 9,447 8,710 9,238
Commercial | Commercial Real Estate      
Activity in allowance for loan losses      
Balance, beginning of year 6,763 7,530 7,883
Provision for loan losses (442) 38 107
Charge-offs (17) (835) (872)
Recoveries 572 30 412
Balance, end of year 6,876 6,763 7,530
Commercial | Acquisition and Development      
Activity in allowance for loan losses      
Balance, beginning of year 417 580 850
Provision for loan losses 396 (167) (270)
Charge-offs (7) 0 0
Recoveries 11 4 0
Balance, end of year 817 417 580
Commercial | Commercial and Industrial      
Activity in allowance for loan losses      
Balance, beginning of year 1,446 1,074 1,012
Provision for loan losses 209 333 129
Charge-offs 0 (85) (79)
Recoveries 1 124 12
Balance, end of year 1,656 1,446 1,074
Commercial | Municipal      
Activity in allowance for loan losses      
Balance, beginning of year 84 54 58
Provision for loan losses 14 30 (4)
Charge-offs 0 0 0
Recoveries 0 0 0
Balance, end of year 98 84 54
Consumer      
Activity in allowance for loan losses      
Balance, beginning of year 3,611 3,123 2,991
Provision for loan losses 528 705 648
Charge-offs (440) (346) (771)
Recoveries 298 129 255
Balance, end of year 3,997 3,611 3,123
Consumer | Residential Mortgage      
Activity in allowance for loan losses      
Balance, beginning of year 3,400 2,979 2,870
Provision for loan losses 363 531 532
Charge-offs (148) (180) (577)
Recoveries 138 70 154
Balance, end of year 3,753 3,400 2,979
Consumer | Installment and Other      
Activity in allowance for loan losses      
Balance, beginning of year 211 144 121
Provision for loan losses 165 174 116
Charge-offs (292) (166) (194)
Recoveries 160 59 101
Balance, end of year $ 244 $ 211 $ 144