XML 90 R79.htm IDEA: XBRL DOCUMENT
v3.21.2

FAIR VALUE - Schedule of Quantitative Information About Nonrecurring Level 3 Fair Value Measurements (Details) - Cost to Sell - Other real estate owned - Appraisal value of collateral $ in Thousands | Jun. 30, 2021 USD ($) | Dec. 31, 2020 USD ($)
--- | --- | ---
Assets at fair value on a nonrecurring basis: | Significant Other Unobservable Inputs (Level 3) |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Other real estate owned | $ 227 | $ 404
Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Other real estate owned, input (percent) | 10 | 10
Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Other real estate owned, input (percent) | 20 | 20
Weighted Average |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Other real estate owned, input (percent) | 16 | 16

X
- Definition Other Real Estate Owned, Fair Value Disclosure + References No definition available. + Details
Name: | gnty_OtherRealEstateOwnedFairValueDisclosure
Namespace Prefix: | gnty_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Value of input used to measure real estate owned by financial institution by financial institution which is not directly related to its business. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
Name: | us-gaap_OtherRealEstateOwnedMeasurementInput
Namespace Prefix: | us-gaap_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputCostToSellMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=gnty_OtherRealEstateOwnedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ValuationTechniqueAxis=gnty_AppraisalValueOfCollateralMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsNonrecurringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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