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LOANS AND ALLOWANCE FOR LOAN LOSSES - Summary of Average Recorded Investment in Impaired Loans and Related Interest Income (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Financing Receivable, Impaired [Line Items] |  |  |
Average Impaired Balance | $ 10,872 | $ 6,932 | $ 8,249
Interest Income Recognized | 50 | 54 | 63
Commercial Real Estate | Owner-occupied |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Average Impaired Balance | 4,636 | 2,455 | 1,495
Interest Income Recognized | 1 | 2 | 2
Commercial Real Estate | Non-owner occupied |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Average Impaired Balance | 83 | 46 | 1,842
Interest Income Recognized | 0 | 0 | 0
Commercial Real Estate | Multi-family |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Average Impaired Balance | 205 | 152 | 148
Interest Income Recognized | 0 | 0 | 0
Commercial Real Estate | Non-owner occupied residential |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Average Impaired Balance | 388 | 217 | 346
Interest Income Recognized | 0 | 0 | 0
Acquisition and development | 1-4 family residential construction |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Average Impaired Balance | 0 | 0 | 181
Interest Income Recognized | 0 | 0 | 0
Acquisition and development | Commercial and land development |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Average Impaired Balance | 641 | 21 | 1
Interest Income Recognized | 0 | 0 | 0
Commercial and industrial |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Average Impaired Balance | 1,196 | 683 | 322
Interest Income Recognized | 0 | 0 | 0
Residential mortgage | First lien |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Average Impaired Balance | 2,995 | 2,582 | 3,234
Interest Income Recognized | 48 | 50 | 59
Residential mortgage | Home-equity - term |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Average Impaired Balance | 11 | 13 | 19
Interest Income Recognized | 0 | 0 | 0
Residential mortgage | Home equity - lines of credit |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Average Impaired Balance | 692 | 750 | 657
Interest Income Recognized | 1 | 2 | 2
Installment and other loans |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Average Impaired Balance | 25 | 13 | 4
Interest Income Recognized | $ 0 | $ 0 | $ 0

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