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LOANS AND ALLOWANCE FOR LOAN LOSSES - Bank's Ratings Based on its Internal Risk Rating System (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]    
Total Loans $ 901,331 $ 883,391
Commercial real estate | Owner-occupied    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 114,991 112,295
Commercial real estate | Non-owner occupied    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 209,601 206,358
Commercial real estate | Multi-family    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 47,893 47,681
Commercial real estate | Non-owner occupied residential    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 64,809 62,533
Acquisition and development | 1-4 family residential construction    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 5,790 4,663
Acquisition and development | Commercial and land development    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 27,648 26,085
Commercial and industrial    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 90,638 88,465
Municipal    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 53,225 53,741
Residential mortgage | First lien    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 143,282 139,851
Residential mortgage | Home equity - term    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 13,605 14,248
Residential mortgage | Home equity - lines of credit    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 122,473 120,353
Installment and other loans    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 7,376 7,118
Pass    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 870,202 844,663
Pass | Commercial real estate | Owner-occupied    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 110,316 103,652
Pass | Commercial real estate | Non-owner occupied    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 199,332 190,726
Pass | Commercial real estate | Multi-family    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 42,739 42,473
Pass | Commercial real estate | Non-owner occupied residential    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 62,307 59,982
Pass | Acquisition and development | 1-4 family residential construction    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 5,790 4,560
Pass | Acquisition and development | Commercial and land development    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 27,008 25,435
Pass | Commercial and industrial    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 89,997 87,588
Pass | Municipal    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 51,236 53,741
Pass | Residential mortgage | First lien    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 138,796 135,558
Pass | Residential mortgage | Home equity - term    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 13,496 14,155
Pass | Residential mortgage | Home equity - lines of credit    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 121,814 119,681
Pass | Installment and other loans    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 7,371 7,112
Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 9,147 15,830
Special Mention | Commercial real estate | Owner-occupied    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 1,616 5,422
Special Mention | Commercial real estate | Non-owner occupied    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 200 4,791
Special Mention | Commercial real estate | Multi-family    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 4,186 4,222
Special Mention | Commercial real estate | Non-owner occupied residential    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 932 949
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 8 10
Special Mention | Commercial and industrial    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 134 251
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 82 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 14,682 14,925
Non-Impaired Substandard | Commercial real estate | Owner-occupied    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 1,978 2,151
Non-Impaired Substandard | Commercial real estate | Non-owner occupied    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 10,069 10,105
Non-Impaired Substandard | Commercial real estate | Multi-family    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 778 787
Non-Impaired Substandard | Commercial real estate | Non-owner occupied residential    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 1,134 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 632 639
Non-Impaired Substandard | Commercial and industrial    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 30 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 7,209 7,973
Impaired - Substandard | Commercial real estate | Owner-occupied    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 1,081 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 190 199
Impaired - Substandard | Commercial real estate | Non-owner occupied residential    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 436 452
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 386 594
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 4,486 4,293
Impaired - Substandard | Residential mortgage | Home equity - term    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 109 93
Impaired - Substandard | Residential mortgage | Home equity - lines of credit    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 516 529
Impaired - Substandard | Installment and other loans    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 5 6
Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 91 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 91 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