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LOANS AND ALLOWANCE FOR LOAN LOSSES - Summary of Impaired Loans by Class (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Recorded Investment (Book Balance) |  |
Impaired Loans with a Specific Allowance | $ 881 | $ 643
Impaired Loans with No Specific Allowance | 10,145 | 7,330
Unpaid Principal Balance (Legal Balance) |  |
Impaired Loans with a Specific Allowance | 881 | 643
Impaired Loans with No Specific Allowance | 13,737 | 10,559
Related Allowance | 51 | 43
Commercial real estate | Owner-occupied |  |
Recorded Investment (Book Balance) |  |
Impaired Loans with a Specific Allowance | 0 | 0
Impaired Loans with No Specific Allowance | 1,237 | 1,070
Unpaid Principal Balance (Legal Balance) |  |
Impaired Loans with a Specific Allowance | 0 | 0
Impaired Loans with No Specific Allowance | 2,479 | 2,236
Related Allowance | 0 | 0
Commercial real estate | Non-owner occupied |  |
Recorded Investment (Book Balance) |  |
Impaired Loans with a Specific Allowance | 0 | 0
Impaired Loans with No Specific Allowance | 4,065 | 736
Unpaid Principal Balance (Legal Balance) |  |
Impaired Loans with a Specific Allowance | 0 | 0
Impaired Loans with No Specific Allowance | 4,856 | 1,323
Related Allowance | 0 | 0
Commercial real estate | Multi-family |  |
Recorded Investment (Book Balance) |  |
Impaired Loans with a Specific Allowance | 0 | 0
Impaired Loans with No Specific Allowance | 165 | 199
Unpaid Principal Balance (Legal Balance) |  |
Impaired Loans with a Specific Allowance | 0 | 0
Impaired Loans with No Specific Allowance | 352 | 368
Related Allowance | 0 | 0
Commercial real estate | Non-owner occupied residential |  |
Recorded Investment (Book Balance) |  |
Impaired Loans with a Specific Allowance | 0 | 0
Impaired Loans with No Specific Allowance | 381 | 452
Unpaid Principal Balance (Legal Balance) |  |
Impaired Loans with a Specific Allowance | 0 | 0
Impaired Loans with No Specific Allowance | 669 | 706
Related Allowance | 0 | 0
Acquisition and development | 1-4 family residential construction |  |
Recorded Investment (Book Balance) |  |
Impaired Loans with a Specific Allowance | 0 |
Impaired Loans with No Specific Allowance | 492 |
Unpaid Principal Balance (Legal Balance) |  |
Impaired Loans with a Specific Allowance | 0 |
Impaired Loans with No Specific Allowance | 492 |
Related Allowance | 0 |
Acquisition and development | Commercial and land development |  |
Recorded Investment (Book Balance) |  |
Impaired Loans with a Specific Allowance |  | 0
Impaired Loans with No Specific Allowance |  | 1
Unpaid Principal Balance (Legal Balance) |  |
Impaired Loans with a Specific Allowance |  | 0
Impaired Loans with No Specific Allowance |  | 16
Related Allowance |  | 0
Commercial and industrial |  |
Recorded Investment (Book Balance) |  |
Impaired Loans with a Specific Allowance | 0 | 0
Impaired Loans with No Specific Allowance | 350 | 594
Unpaid Principal Balance (Legal Balance) |  |
Impaired Loans with a Specific Allowance | 0 | 0
Impaired Loans with No Specific Allowance | 495 | 715
Related Allowance | 0 | 0
Residential mortgage | First lien |  |
Recorded Investment (Book Balance) |  |
Impaired Loans with a Specific Allowance | 872 | 643
Impaired Loans with No Specific Allowance | 2,964 | 3,650
Unpaid Principal Balance (Legal Balance) |  |
Impaired Loans with a Specific Allowance | 872 | 643
Impaired Loans with No Specific Allowance | 3,706 | 4,399
Related Allowance | 42 | 43
Residential mortgage | Home equity – term |  |
Recorded Investment (Book Balance) |  |
Impaired Loans with a Specific Allowance | 0 | 0
Impaired Loans with No Specific Allowance | 22 | 93
Unpaid Principal Balance (Legal Balance) |  |
Impaired Loans with a Specific Allowance | 0 | 0
Impaired Loans with No Specific Allowance | 27 | 103
Related Allowance | 0 | 0
Residential mortgage | Home equity lines of credit |  |
Recorded Investment (Book Balance) |  |
Impaired Loans with a Specific Allowance | 0 | 0
Impaired Loans with No Specific Allowance | 467 | 529
Unpaid Principal Balance (Legal Balance) |  |
Impaired Loans with a Specific Allowance | 0 | 0
Impaired Loans with No Specific Allowance | 628 | 659
Related Allowance | 0 | 0
Installment and other loans |  |
Recorded Investment (Book Balance) |  |
Impaired Loans with a Specific Allowance | 9 | 0
Impaired Loans with No Specific Allowance | 2 | 6
Unpaid Principal Balance (Legal Balance) |  |
Impaired Loans with a Specific Allowance | 9 | 0
Impaired Loans with No Specific Allowance | 33 | 34
Related Allowance | $ 9 | $ 0

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