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v3.22.2.2

REGULATORY MATTERS - Narrative (Details) | Sep. 30, 2022
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Maximum |
Common equity tier 1 capital to risk-weighted assets: |
Capital conservation buffer percentage | 2.50%

X
- Definition Capital conservation buffer percentage. + References No definition available. + Details
Name: | gnty_CapitalConservationBufferPercentage
Namespace Prefix: | gnty_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |