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LOANS AND ALLOWANCE FOR LOAN LOSSES - Summary of Ending Loan Balance Individually Evaluated for Impairment (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Loans allocated by: |  |  |  |
Individually evaluated for impairment | $ 11,026 | $ 7,973 |  |
Collectively evaluated for impairment | 998,986 | 875,418 |  |
Total Loans | 1,010,012 | 883,391 |  |
Allowance for loan losses allocated by: |  |  |  |
Individually evaluated for impairment | 51 | 43 |  |
Collectively evaluated for impairment | 12,745 | 12,732 |  |
Allowance for loan losses, Total | 12,796 | 12,775 | $ 13,568 | $ 14,747
Commercial |  |  |  |
Loans allocated by: |  |  |  |
Individually evaluated for impairment | 6,690 | 3,052 |  |
Collectively evaluated for impairment | 674,935 | 598,769 |  |
Total Loans | 681,625 | 601,821 |  |
Allowance for loan losses allocated by: |  |  |  |
Individually evaluated for impairment | 0 | 0 |  |
Collectively evaluated for impairment | 8,710 | 9,238 |  |
Allowance for loan losses, Total | 8,710 | 9,238 |  |
Consumer |  |  |  |
Loans allocated by: |  |  |  |
Individually evaluated for impairment | 4,336 | 4,921 |  |
Collectively evaluated for impairment | 324,051 | 276,649 |  |
Total Loans | 328,387 | 281,570 |  |
Allowance for loan losses allocated by: |  |  |  |
Individually evaluated for impairment | 51 | 43 |  |
Collectively evaluated for impairment | 3,560 | 3,080 |  |
Allowance for loan losses, Total | 3,611 | 3,123 |  |
Unallocated |  |  |  |
Loans allocated by: |  |  |  |
Individually evaluated for impairment | 0 | 0 |  |
Collectively evaluated for impairment | 0 | 0 |  |
Total Loans | 0 | 0 |  |
Allowance for loan losses allocated by: |  |  |  |
Individually evaluated for impairment | 0 | 0 |  |
Collectively evaluated for impairment | 475 | 414 |  |
Allowance for loan losses, Total | 475 | 414 |  |
Commercial Real Estate | Commercial |  |  |  |
Loans allocated by: |  |  |  |
Individually evaluated for impairment | 5,848 | 2,457 |  |
Collectively evaluated for impairment | 487,068 | 426,410 |  |
Total Loans | 492,916 | 428,867 |  |
Allowance for loan losses allocated by: |  |  |  |
Individually evaluated for impairment | 0 | 0 |  |
Collectively evaluated for impairment | 6,763 | 7,530 |  |
Allowance for loan losses, Total | 6,763 | 7,530 |  |
Acquisition and Development | Commercial |  |  |  |
Loans allocated by: |  |  |  |
Individually evaluated for impairment | 492 | 1 |  |
Collectively evaluated for impairment | 30,489 | 30,747 |  |
Total Loans | 30,981 | 30,748 |  |
Allowance for loan losses allocated by: |  |  |  |
Individually evaluated for impairment | 0 | 0 |  |
Collectively evaluated for impairment | 417 | 580 |  |
Allowance for loan losses, Total | 417 | 580 |  |
Commercial and Industrial |  |  |  |
Loans allocated by: |  |  |  |
Total Loans | 115,663 | 88,465 |  |
Commercial and Industrial | Commercial |  |  |  |
Loans allocated by: |  |  |  |
Individually evaluated for impairment | 350 | 594 |  |
Collectively evaluated for impairment | 115,313 | 87,871 |  |
Total Loans | 115,663 | 88,465 |  |
Allowance for loan losses allocated by: |  |  |  |
Individually evaluated for impairment | 0 | 0 |  |
Collectively evaluated for impairment | 1,446 | 1,074 |  |
Allowance for loan losses, Total | 1,446 | 1,074 |  |
Municipal |  |  |  |
Loans allocated by: |  |  |  |
Total Loans | 42,065 | 53,741 |  |
Municipal | Commercial |  |  |  |
Loans allocated by: |  |  |  |
Individually evaluated for impairment | 0 | 0 |  |
Collectively evaluated for impairment | 42,065 | 53,741 |  |
Total Loans | 42,065 | 53,741 |  |
Allowance for loan losses allocated by: |  |  |  |
Individually evaluated for impairment | 0 | 0 |  |
Collectively evaluated for impairment | 84 | 54 |  |
Allowance for loan losses, Total | 84 | 54 |  |
Residential Mortgage | Consumer |  |  |  |
Loans allocated by: |  |  |  |
Individually evaluated for impairment | 4,325 | 4,915 |  |
Collectively evaluated for impairment | 302,160 | 269,537 |  |
Total Loans | 306,485 | 274,452 |  |
Allowance for loan losses allocated by: |  |  |  |
Individually evaluated for impairment | 42 | 43 |  |
Collectively evaluated for impairment | 3,358 | 2,936 |  |
Allowance for loan losses, Total | 3,400 | 2,979 |  |
Installment and other loans |  |  |  |
Loans allocated by: |  |  |  |
Total Loans | 21,902 | 7,118 |  |
Installment and other loans | Consumer |  |  |  |
Loans allocated by: |  |  |  |
Individually evaluated for impairment | 11 | 6 |  |
Collectively evaluated for impairment | 21,891 | 7,112 |  |
Total Loans | 21,902 | 7,118 |  |
Allowance for loan losses allocated by: |  |  |  |
Individually evaluated for impairment | 9 | 0 |  |
Collectively evaluated for impairment | 202 | 144 |  |
Allowance for loan losses, Total | $ 211 | $ 144 |  |

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