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CONSOLIDATED STATEMENTS OF EARNINGS (Unaudited) (Parenthetical) | 3 Months Ended
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Mar. 31, 2021
Income Statement [Abstract] |
Percentage of adjusted effect of stock dividend issued | 10.00%

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- Definition Percentage of adjusted effect of stock dividend issued. + References No definition available. + Details
Name: | gnty_PercentageOfAdjustedEffectOfStockDividendIssued
Namespace Prefix: | gnty_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_IncomeStatementAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration