XML 86 R71.htm IDEA: XBRL DOCUMENT
v3.8.0.1

LOANS AND ALLOWANCE FOR LOAN LOSSES - Troubled Debt Restructuring (Details) | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) contract | Dec. 31, 2016 USD ($) contract
Financing Receivable, Modifications [Line Items] |  |
Total | $ 657,000 | $ 505,000
Specific reserves on TDRs | $ 17,000 | $ 4,000
Troubled Debt Restructurings: |  |
Number of Contracts | contract | 3,000 | 4,000
Pre-Modification Outstanding Recorded Investment | $ 392,000 | $ 338,000
Post-Modification Outstanding Recorded Investment | 375,000 | 334,000
Increase in allowance for loan losses due to TDRs | 0 | 0
Troubled debt restructuring charge-offs | $ 0 | $ 0
Commercial and industrial |  |
Troubled Debt Restructurings: |  |
Number of Contracts | contract | 2,000 | 1,000
Pre-Modification Outstanding Recorded Investment | $ 381,000 | $ 90,000
Post-Modification Outstanding Recorded Investment | $ 364,000 | $ 90,000
Commercial real estate |  |
Troubled Debt Restructurings: |  |
Number of Contracts | contract |  |
Pre-Modification Outstanding Recorded Investment | $ 0 |
Post-Modification Outstanding Recorded Investment | $ 0 |
Consumer |  |
Troubled Debt Restructurings: |  |
Number of Contracts | contract | 0 |
Pre-Modification Outstanding Recorded Investment | $ 0 |
Post-Modification Outstanding Recorded Investment | $ 0 |
1-4 family residential |  |
Troubled Debt Restructurings: |  |
Number of Contracts | contract | 1,000 | 3,000
Pre-Modification Outstanding Recorded Investment | $ 11,000 | $ 248,000
Post-Modification Outstanding Recorded Investment | $ 11,000 | 244,000
Farmland |  |
Troubled Debt Restructurings: |  |
Number of Contracts | contract | 0 |
Pre-Modification Outstanding Recorded Investment | $ 0 |
Post-Modification Outstanding Recorded Investment | $ 0 |
Multi-family residential |  |
Troubled Debt Restructurings: |  |
Number of Contracts | contract | 0 |
Pre-Modification Outstanding Recorded Investment | $ 0 |
Post-Modification Outstanding Recorded Investment | $ 0 |
Agricultural |  |
Troubled Debt Restructurings: |  |
Number of Contracts | contract | 0 |
Pre-Modification Outstanding Recorded Investment | $ 0 |
Post-Modification Outstanding Recorded Investment | 0 |
Nonaccrual TDRs |  |
Financing Receivable, Modifications [Line Items] |  |
Total | 0 | 43,000
Performing TDRs |  |
Financing Receivable, Modifications [Line Items] |  |
Total | $ 657,000 | $ 462,000

X
- Definition Financing Receivables, Impaired, Troubled Debt Restructuring, Increase in Allowance for Loan Losses + References No definition available. + Details
Name: | gnty_FinancingReceivablesImpairedTroubledDebtRestructuringIncreaseinAllowanceforLoanLosses
Namespace Prefix: | gnty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Troubled Debt Restructuring [Abstract] + References No definition available. + Details
Name: | gnty_TroubledDebtRestructuringAbstract
Namespace Prefix: | gnty_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of allowance for credit losses related to receivables which had been measured under a general allowance for credit losses methodology that are now identified as troubled debt restructurings. + References No definition available. + Details
Name: | us-gaap_AllowanceForCreditLossesChangeInMethodOfCalculatingImpairment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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_FinancingReceivableModificationsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524 + Details
Name: | us-gaap_FinancingReceivableModificationsNumberOfContracts2
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Post-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524 + Details
Name: | us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Pre-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524 + Details
Name: | us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82895541&loc=d3e18845-111554 + Details
Name: | us-gaap_FinancingReceivableModificationsRecordedInvestment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Reflects the amount of the write-down related to a troubled debt restructuring. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82895541&loc=d3e18845-111554 + Details
Name: | us-gaap_FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialRealEstatePortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=gnty_OneToFourFamilyResidentialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=gnty_FarmlandPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=gnty_MultiFamilyResidentialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=gnty_AgriculturalPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentPerformanceStatusAxis=us-gaap_NonperformingFinancingReceivableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentPerformanceStatusAxis=us-gaap_PerformingFinancingReceivableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |