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LOANS AND ALLOWANCE FOR LOAN LOSSES - Bank's Ratings Based on its Internal Risk Rating System (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]    
Total Loans $ 934,382 $ 883,391
Commercial real estate | Owner-occupied    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 116,419 112,295
Commercial real estate | Non-owner occupied    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 217,070 206,358
Commercial real estate | Multi-family    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 48,637 47,681
Commercial real estate | Non-owner occupied residential    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 68,621 62,533
Acquisition and development | 1-4 family residential construction    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 8,036 4,663
Acquisition and development | Commercial and land development    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 28,481 26,085
Commercial and industrial    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 97,913 88,465
Municipal    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 51,381 53,741
Residential mortgage | First lien    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 150,173 139,851
Residential mortgage | Home equity - term    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 13,019 14,248
Residential mortgage | Home equity - lines of credit    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 127,262 120,353
Installment and other loans    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 7,370 7,118
Pass    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 901,714 844,663
Pass | Commercial real estate | Owner-occupied    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 111,737 103,652
Pass | Commercial real estate | Non-owner occupied    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 206,823 190,726
Pass | Commercial real estate | Multi-family    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 43,526 42,473
Pass | Commercial real estate | Non-owner occupied residential    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 66,024 59,982
Pass | Acquisition and development | 1-4 family residential construction    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 8,036 4,560
Pass | Acquisition and development | Commercial and land development    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 27,849 25,435
Pass | Commercial and industrial    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 95,124 87,588
Pass | Municipal    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 49,392 53,741
Pass | Residential mortgage | First lien    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 146,200 135,558
Pass | Residential mortgage | Home equity - term    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 12,994 14,155
Pass | Residential mortgage | Home equity - lines of credit    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 126,648 119,681
Pass | Installment and other loans    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 7,361 7,112
Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 11,692 15,830
Special Mention | Commercial real estate | Owner-occupied    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 1,814 5,422
Special Mention | Commercial real estate | Non-owner occupied    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 196 4,791
Special Mention | Commercial real estate | Multi-family    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 4,159 4,222
Special Mention | Commercial real estate | Non-owner occupied residential    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 1,062 949
Special Mention | Acquisition and development | 1-4 family residential construction    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 0 103
Special Mention | Acquisition and development | Commercial and land development    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 7 10
Special Mention | Commercial and industrial    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 2,384 251
Special Mention | Municipal    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 1,989 0
Special Mention | Residential mortgage | First lien    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 0 0
Special Mention | Residential mortgage | Home equity - term    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 0 0
Special Mention | Residential mortgage | Home equity - lines of credit    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 81 82
Special Mention | Installment and other loans    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 0 0
Non-Impaired Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 14,612 14,925
Non-Impaired Substandard | Commercial real estate | Owner-occupied    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 1,959 2,151
Non-Impaired Substandard | Commercial real estate | Non-owner occupied    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 10,051 10,105
Non-Impaired Substandard | Commercial real estate | Multi-family    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 770 787
Non-Impaired Substandard | Commercial real estate | Non-owner occupied residential    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 1,117 1,150
Non-Impaired Substandard | Acquisition and development | 1-4 family residential construction    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 0 0
Non-Impaired Substandard | Acquisition and development | Commercial and land development    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 625 639
Non-Impaired Substandard | Commercial and industrial    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 29 32
Non-Impaired Substandard | Municipal    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 0 0
Non-Impaired Substandard | Residential mortgage | First lien    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 0 0
Non-Impaired Substandard | Residential mortgage | Home equity - term    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 0 0
Non-Impaired Substandard | Residential mortgage | Home equity - lines of credit    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 61 61
Non-Impaired Substandard | Installment and other loans    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 0 0
Impaired - Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 6,364 7,973
Impaired - Substandard | Commercial real estate | Owner-occupied    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 909 1,070
Impaired - Substandard | Commercial real estate | Non-owner occupied    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 0 736
Impaired - Substandard | Commercial real estate | Multi-family    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 182 199
Impaired - Substandard | Commercial real estate | Non-owner occupied residential    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 418 452
Impaired - Substandard | Acquisition and development | 1-4 family residential construction    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 0 0
Impaired - Substandard | Acquisition and development | Commercial and land development    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 0 1
Impaired - Substandard | Commercial and industrial    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 376 594
Impaired - Substandard | Municipal    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 0 0
Impaired - Substandard | Residential mortgage | First lien    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 3,973 4,293
Impaired - Substandard | Residential mortgage | Home equity - term    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 25 93
Impaired - Substandard | Residential mortgage | Home equity - lines of credit    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 472 529
Impaired - Substandard | Installment and other loans    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 9 6
Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 0 0
Doubtful | Commercial real estate | Owner-occupied    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 0 0
Doubtful | Commercial real estate | Non-owner occupied    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 0 0
Doubtful | Commercial real estate | Multi-family    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 0 0
Doubtful | Commercial real estate | Non-owner occupied residential    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 0 0
Doubtful | Acquisition and development | 1-4 family residential construction    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 0 0
Doubtful | Acquisition and development | Commercial and land development    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 0 0
Doubtful | Commercial and industrial    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 0 0
Doubtful | Municipal    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 0 0
Doubtful | Residential mortgage | First lien    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 0 0
Doubtful | Residential mortgage | Home equity - term    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 0 0
Doubtful | Residential mortgage | Home equity - lines of credit    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 0 0
Doubtful | Installment and other loans    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans $ 0 $ 0