XML 72 R57.htm IDEA: XBRL DOCUMENT
v3.24.0.1

MARKETABLE SECURITIES - Narrative (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2022 USD ($) | Sep. 30, 2021 USD ($) | Dec. 31, 2023 USD ($) Position Security | Dec. 31, 2022 USD ($) Security | Dec. 31, 2021 USD ($) Security
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items] |  |  |  |  |
Available for sale securities transferred to held to maturity | $ 106,157,000 | $ 172,292,000 | $ 0 | $ 106,157,000 | $ 172,292,000
Available for sale securities transferred to held to maturity, net of unrealized loss | $ 13,186,000 |  |  | 13,186,000 | $ 10,235,000
Available for sale securities transferred to held to maturity, net of unrealized gain |  | $ 10,235,000 |  |  |
Allowance for credit losses for available for sale debt securities |  |  | $ 0 | $ 0 |
Number of investment in an unrealized loss position | Position |  |  | 233 |  |
Number of investment in an sale debt securities | Position |  |  | 74 |  |
Percentage of unrealized loss exceeds book value |  |  | 20.00% |  |
Number of securities other than agencies amount | Security |  |  | 0 | 0 |
Securities held to maturity |  |  | $ 404,208,000 | $ 509,008,000 |
Securities held to maturity, nonaccrual |  |  | 0 |  |
Fair value of securities pledged as collateral |  |  | $ 317,112,000 | $ 396,584,000 |
Number of securities sold | Security |  |  | 0 | 0 |
Number of held to maturity securities sold | Security |  |  | 0 | 0 | 0
Accumulated other comprehensive income |  |  | $ 6,964,000 | $ 5,860,000 |
Proceeds From sales |  |  | 21,268,000 | 26,130,000 | $ 0
Gross gains |  |  | 184,000 | 234,000 | 0
Gross losses |  |  | (413,000) | $ (62,000) | $ 0
Past Due |  |  |  |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items] |  |  |  |  |
Securities held to maturity |  |  | $ 0 |  |

X
- Definition Accumulated other comprehensive income loss + References No definition available. + Details
Name: | gnty_AccumulatedOtherComprehensiveIncomeLoss
Namespace Prefix: | gnty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Available for sale securities transferred to held to maturity. + References No definition available. + Details
Name: | gnty_AvailableForSaleSecuritiesTransferredToHeldToMaturity
Namespace Prefix: | gnty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Available for sale securities transferred to held to maturity net of unrealized gain. + References No definition available. + Details
Name: | gnty_AvailableForSaleSecuritiesTransferredToHeldToMaturityNetOfUnrealizedGain
Namespace Prefix: | gnty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Available for sale securities transferred to held to maturity, net of unrealized loss + References No definition available. + Details
Name: | gnty_AvailableForSaleSecuritiesTransferredToHeldToMaturityNetOfUnrealizedLoss
Namespace Prefix: | gnty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Debt securities available for sale debt securities number of positions. + References No definition available. + Details
Name: | gnty_DebtSecuritiesAvailableForSaleDebtSecuritiePositionNumberOfPositions
Namespace Prefix: | gnty_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Held to maturity number of securities sold. + References No definition available. + Details
Name: | gnty_HeldToMaturityNumberOfSecuritiesSold
Namespace Prefix: | gnty_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Marketable Securities Gross Realized Gains + References No definition available. + Details
Name: | gnty_MarketableSecuritiesGrossRealizedGains
Namespace Prefix: | gnty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Marketable Securities Gross Realized Losses + References No definition available. + Details
Name: | gnty_MarketableSecuritiesGrossRealizedLosses
Namespace Prefix: | gnty_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Marketable Securities Pledged As Collateral + References No definition available. + Details
Name: | gnty_MarketableSecuritiesPledgedAsCollateral
Namespace Prefix: | gnty_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Number of securities held amount greater than ten percentage of share holders equity. + References No definition available. + Details
Name: | gnty_NumberOfSecuritiesHeldAmountGreaterThanTenPercentageOfShareHoldersEquity
Namespace Prefix: | gnty_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number Of Securities Sold + References No definition available. + Details
Name: | gnty_NumberOfSecuritiesSold
Namespace Prefix: | gnty_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of unrealized loss exceeds book value. + References No definition available. + Details
Name: | gnty_PercentageOfUnrealizedLossExceedsBookValue
Namespace Prefix: | gnty_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Proceeds From Sale Of Marketable Securities + References No definition available. + Details
Name: | gnty_ProceedsFromSaleOfMarketableSecurities
Namespace Prefix: | gnty_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (aaa) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479130/326-30-45-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-9 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-9 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (b)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-6 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-4 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of investment in debt security measured at amortized cost (held-to-maturity) on nonaccrual status. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 16 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-16 + Details
Name: | us-gaap_DebtSecuritiesHeldToMaturityNonaccrual
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, before allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479344/326-20-45-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-5 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 14 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-14 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 7A -SubTopic 10 -Topic 310 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-7A + Details
Name: | us-gaap_HeldToMaturitySecurities
Namespace Prefix: | us-gaap_
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_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancialAssetPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |