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EARNINGS PER SHARE - Schedule of Basic and Diluted Earnings Per Share (Parenthetical) (Details) | 3 Months Ended
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Mar. 31, 2021
Earnings Per Share [Abstract] |
Percentage of stock dividend issued | 10.00%

X
- Definition Percentage of common stock dividend issued. + References No definition available. + Details
Name: | gnty_PercentageOfCommonStockDividendIssued
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_EarningsPerShareAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration