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EQUITY AWARDS - Summary of Restricted Stock Awards and Units Activity (Parenthetical) (Details) | 9 Months Ended
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Sep. 30, 2021
Restricted Stock Units (RSUs) |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Stock dividend percentage | 10.00%

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- Definition Share based compensation arrangement by share based payment award non options equity instruments stock dividend percentage. + References No definition available. + Details
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Namespace Prefix: | gnty_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_RestrictedStockUnitsRSUMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |