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REGULATORY MATTERS - Narrative (Details)	Sep. 30, 2022
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: