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LOANS AND ALLOWANCE FOR LOAN LOSSES - Narrative (Details) - USD ($) | 6 Months Ended | 12 Months Ended
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Jun. 30, 2018 | Dec. 31, 2018
Receivables [Abstract] |  |
Increase in allowance for loan losses due to TDRs | $ 0 | $ 0
Troubled debt restructuring charge-offs | $ 0 | $ 0

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- Definition Financing receivables, impaired, troubled debt restructuring, increase in allowance for loan losses. + References No definition available. + Details
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Namespace Prefix: | gnty_
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- Definition Reflects the amount of the write-down related to a troubled debt restructuring. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82895541&loc=d3e18845-111554 + Details
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- References No definition available. + Details
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