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EQUITY AWARDS - Schedule of Nonvested Stock Option Activity (Parenthetical) (Details) | 3 Months Ended
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Mar. 31, 2021
Share-based Payment Arrangement [Abstract] |
Stock dividend percentage | 10.00%

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- Definition Share based compensation arrangement by share based payment award nonvested options stock dividend percentage. + References No definition available. + Details
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Namespace Prefix: | gnty_
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Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Balance Type: | na
Period Type: | duration