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FAIR VALUE - Summary of Assets Measured at Fair Value on Nonrecurring Basis (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Summary of assets measured at fair value on a nonrecurring basis    
Foreclosed real estate $ 961 $ 346
Fair Value, Measurements, Nonrecurring    
Summary of assets measured at fair value on a nonrecurring basis    
Impaired Loans 7,173 4,350
Fair Value, Measurements, Nonrecurring | Commercial real estate | Owner-occupied    
Summary of assets measured at fair value on a nonrecurring basis    
Impaired Loans 430 777
Fair Value, Measurements, Nonrecurring | Commercial real estate | Non-owner occupied    
Summary of assets measured at fair value on a nonrecurring basis    
Impaired Loans 4,066 736
Fair Value, Measurements, Nonrecurring | Commercial real estate | Multi-family    
Summary of assets measured at fair value on a nonrecurring basis    
Impaired Loans 165 199
Fair Value, Measurements, Nonrecurring | Commercial real estate | Non-owner occupied residential    
Summary of assets measured at fair value on a nonrecurring basis    
Impaired Loans 344 409
Fair Value, Measurements, Nonrecurring | Acquisition and development | Commercial and land development    
Summary of assets measured at fair value on a nonrecurring basis    
Impaired Loans   1
Fair Value, Measurements, Nonrecurring | Commercial and industrial    
Summary of assets measured at fair value on a nonrecurring basis    
Impaired Loans 53 66
Fair Value, Measurements, Nonrecurring | Residential mortgage    
Summary of assets measured at fair value on a nonrecurring basis    
Foreclosed real estate   88
Fair Value, Measurements, Nonrecurring | Residential mortgage | First lien    
Summary of assets measured at fair value on a nonrecurring basis    
Impaired Loans 1,951 1,994
Fair Value, Measurements, Nonrecurring | Residential mortgage | Home equity lines of credit    
Summary of assets measured at fair value on a nonrecurring basis    
Impaired Loans 161 162
Fair Value, Measurements, Nonrecurring | Installment and other loans    
Summary of assets measured at fair value on a nonrecurring basis    
Impaired Loans 3 6
Fair Value, Measurements, Nonrecurring | Level 1    
Summary of assets measured at fair value on a nonrecurring basis    
Impaired Loans 0 0
Fair Value, Measurements, Nonrecurring | Level 1 | Commercial real estate | Owner-occupied    
Summary of assets measured at fair value on a nonrecurring basis    
Impaired Loans 0 0
Fair Value, Measurements, Nonrecurring | Level 1 | Commercial real estate | Non-owner occupied    
Summary of assets measured at fair value on a nonrecurring basis    
Impaired Loans 0 0
Fair Value, Measurements, Nonrecurring | Level 1 | Commercial real estate | Multi-family    
Summary of assets measured at fair value on a nonrecurring basis    
Impaired Loans 0 0
Fair Value, Measurements, Nonrecurring | Level 1 | Commercial real estate | Non-owner occupied residential    
Summary of assets measured at fair value on a nonrecurring basis    
Impaired Loans 0 0
Fair Value, Measurements, Nonrecurring | Level 1 | Acquisition and development | Commercial and land development    
Summary of assets measured at fair value on a nonrecurring basis    
Impaired Loans   0
Fair Value, Measurements, Nonrecurring | Level 1 | Commercial and industrial    
Summary of assets measured at fair value on a nonrecurring basis    
Impaired Loans 0 0
Fair Value, Measurements, Nonrecurring | Level 1 | Residential mortgage    
Summary of assets measured at fair value on a nonrecurring basis    
Foreclosed real estate   0
Fair Value, Measurements, Nonrecurring | Level 1 | Residential mortgage | First lien    
Summary of assets measured at fair value on a nonrecurring basis    
Impaired Loans 0 0
Fair Value, Measurements, Nonrecurring | Level 1 | Residential mortgage | Home equity lines of credit    
Summary of assets measured at fair value on a nonrecurring basis    
Impaired Loans 0 0
Fair Value, Measurements, Nonrecurring | Level 1 | Installment and other loans    
Summary of assets measured at fair value on a nonrecurring basis    
Impaired Loans 0 0
Fair Value, Measurements, Nonrecurring | Level 2    
Summary of assets measured at fair value on a nonrecurring basis    
Impaired Loans 0 0
Fair Value, Measurements, Nonrecurring | Level 2 | Commercial real estate | Owner-occupied    
Summary of assets measured at fair value on a nonrecurring basis    
Impaired Loans 0 0
Fair Value, Measurements, Nonrecurring | Level 2 | Commercial real estate | Non-owner occupied    
Summary of assets measured at fair value on a nonrecurring basis    
Impaired Loans 0 0
Fair Value, Measurements, Nonrecurring | Level 2 | Commercial real estate | Multi-family    
Summary of assets measured at fair value on a nonrecurring basis    
Impaired Loans 0 0
Fair Value, Measurements, Nonrecurring | Level 2 | Commercial real estate | Non-owner occupied residential    
Summary of assets measured at fair value on a nonrecurring basis    
Impaired Loans 0 0
Fair Value, Measurements, Nonrecurring | Level 2 | Acquisition and development | Commercial and land development    
Summary of assets measured at fair value on a nonrecurring basis    
Impaired Loans   0
Fair Value, Measurements, Nonrecurring | Level 2 | Commercial and industrial    
Summary of assets measured at fair value on a nonrecurring basis    
Impaired Loans 0 0
Fair Value, Measurements, Nonrecurring | Level 2 | Residential mortgage    
Summary of assets measured at fair value on a nonrecurring basis    
Foreclosed real estate   0
Fair Value, Measurements, Nonrecurring | Level 2 | Residential mortgage | First lien    
Summary of assets measured at fair value on a nonrecurring basis    
Impaired Loans 0 0
Fair Value, Measurements, Nonrecurring | Level 2 | Residential mortgage | Home equity lines of credit    
Summary of assets measured at fair value on a nonrecurring basis    
Impaired Loans 0 0
Fair Value, Measurements, Nonrecurring | Level 2 | Installment and other loans    
Summary of assets measured at fair value on a nonrecurring basis    
Impaired Loans 0 0
Fair Value, Measurements, Nonrecurring | Level 3    
Summary of assets measured at fair value on a nonrecurring basis    
Impaired Loans 7,173 4,350
Fair Value, Measurements, Nonrecurring | Level 3 | Commercial real estate | Owner-occupied    
Summary of assets measured at fair value on a nonrecurring basis    
Impaired Loans 430 777
Fair Value, Measurements, Nonrecurring | Level 3 | Commercial real estate | Non-owner occupied    
Summary of assets measured at fair value on a nonrecurring basis    
Impaired Loans 4,066 736
Fair Value, Measurements, Nonrecurring | Level 3 | Commercial real estate | Multi-family    
Summary of assets measured at fair value on a nonrecurring basis    
Impaired Loans 165 199
Fair Value, Measurements, Nonrecurring | Level 3 | Commercial real estate | Non-owner occupied residential    
Summary of assets measured at fair value on a nonrecurring basis    
Impaired Loans 344 409
Fair Value, Measurements, Nonrecurring | Level 3 | Acquisition and development | Commercial and land development    
Summary of assets measured at fair value on a nonrecurring basis    
Impaired Loans   1
Fair Value, Measurements, Nonrecurring | Level 3 | Commercial and industrial    
Summary of assets measured at fair value on a nonrecurring basis    
Impaired Loans 53 66
Fair Value, Measurements, Nonrecurring | Level 3 | Residential mortgage    
Summary of assets measured at fair value on a nonrecurring basis    
Foreclosed real estate   88
Fair Value, Measurements, Nonrecurring | Level 3 | Residential mortgage | First lien    
Summary of assets measured at fair value on a nonrecurring basis    
Impaired Loans 1,951 1,994
Fair Value, Measurements, Nonrecurring | Level 3 | Residential mortgage | Home equity lines of credit    
Summary of assets measured at fair value on a nonrecurring basis    
Impaired Loans 161 162
Fair Value, Measurements, Nonrecurring | Level 3 | Installment and other loans    
Summary of assets measured at fair value on a nonrecurring basis    
Impaired Loans $ 3 $ 6