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LOAN PERFORMANCE - Nonaccrual loans, segregated by loan class (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Nonaccrual loans |  |  |
Nonaccrual loans | $ 7,646,000 | $ 6,239,000 |
Interest income that would have been earned under the original terms of the nonaccrual loans | 402,000 | 779,000 | $ 776,000
Commercial and industrial |  |  |
Nonaccrual loans |  |  |
Nonaccrual loans | 3,280,000 | 2,318,000 |
Commercial real estate |  |  |
Nonaccrual loans |  |  |
Nonaccrual loans | 3,216,000 | 2,118,000 |
Construction and development |  |  |
Nonaccrual loans |  |  |
Nonaccrual loans | 252,000 | 458,000 |
One to four family residential |  |  |
Nonaccrual loans |  |  |
Nonaccrual loans | $ 898,000 | 1,302,000 |
Multi‑family residential |  |  |
Nonaccrual loans |  |  |
Nonaccrual loans |  | 7,000 |
Agriculture |  |  |
Nonaccrual loans |  |  |
Nonaccrual loans |  | $ 36,000 |

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- Definition Reflects the amount of additional interest income that would have been recorded if impaired or nonperforming loans were instead current, in compliance with their original terms, and outstanding throughout the reporting period or since origination (if held for part of the period). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82895541&loc=d3e18794-111554 + Details
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- Definition Reflects the carrying amount of loans deemed to be questionable as to collection on which no interest is continuing to be recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5111-111524 + Details
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