XML 99 R72.htm IDEA: XBRL DOCUMENT
v3.8.0.1

LOANS AND ALLOWANCE FOR LOAN LOSSES - Summary of Impaired Loans (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Unpaid Principal Balance [Abstract] |  |
Unpaid Principal Balance, With no related allowance recorded | $ 5,717 | $ 5,062
Unpaid Principal Balance, With related allowance recorded | 623 | 1,256
Unpaid Principal Balance | 6,340 | 6,318
Recorded Investment [Abstract] |  |
Recorded Investment, With no related allowance recorded | 5,717 | 5,062
Recorded Investment, With related allowance recorded | 623 | 1,256
Recorded Investment | 6,340 | 6,318
Related Allowance [Abstract] |  |
Related Allowance | 134 | 253
Average Recorded Investment [Abstract] |  |
Average Recorded Investment, With no related allowance recorded | 6,786 | 3,695
Average Recorded Investment, With related allowance recorded | 1,953 | 4,118
Average Recorded Investment | 8,739 | 7,813
Commercial and industrial |  |
Unpaid Principal Balance [Abstract] |  |
Unpaid Principal Balance, With no related allowance recorded | 437 | 28
Unpaid Principal Balance, With related allowance recorded | 26 | 203
Recorded Investment [Abstract] |  |
Recorded Investment, With no related allowance recorded | 437 | 28
Recorded Investment, With related allowance recorded | 26 | 203
Related Allowance [Abstract] |  |
Related Allowance | 17 | 64
Average Recorded Investment [Abstract] |  |
Average Recorded Investment, With no related allowance recorded | 434 | 809
Average Recorded Investment, With related allowance recorded | 315 | 3,153
Construction and development |  |
Unpaid Principal Balance [Abstract] |  |
Unpaid Principal Balance, With no related allowance recorded | 0 | 1,825
Unpaid Principal Balance, With related allowance recorded | 0 | 0
Recorded Investment [Abstract] |  |
Recorded Investment, With no related allowance recorded | 0 | 1,825
Recorded Investment, With related allowance recorded | 0 | 0
Related Allowance [Abstract] |  |
Related Allowance | 0 | 0
Average Recorded Investment [Abstract] |  |
Average Recorded Investment, With no related allowance recorded | 311 | 172
Average Recorded Investment, With related allowance recorded | 7 | 0
Commercial real estate |  |
Unpaid Principal Balance [Abstract] |  |
Unpaid Principal Balance, With no related allowance recorded | 3,979 | 1,196
Unpaid Principal Balance, With related allowance recorded | 279 | 0
Recorded Investment [Abstract] |  |
Recorded Investment, With no related allowance recorded | 3,979 | 1,196
Recorded Investment, With related allowance recorded | 279 | 0
Related Allowance [Abstract] |  |
Related Allowance | 27 | 0
Average Recorded Investment [Abstract] |  |
Average Recorded Investment, With no related allowance recorded | 4,230 | 871
Average Recorded Investment, With related allowance recorded | 505 | 0
Farmland |  |
Unpaid Principal Balance [Abstract] |  |
Unpaid Principal Balance, With no related allowance recorded | 6 | 89
Unpaid Principal Balance, With related allowance recorded | 157 | 169
Recorded Investment [Abstract] |  |
Recorded Investment, With no related allowance recorded | 6 | 89
Recorded Investment, With related allowance recorded | 157 | 169
Related Allowance [Abstract] |  |
Related Allowance | 85 | 47
Average Recorded Investment [Abstract] |  |
Average Recorded Investment, With no related allowance recorded | 90 | 109
Average Recorded Investment, With related allowance recorded | 131 | 169
1-4 family residential |  |
Unpaid Principal Balance [Abstract] |  |
Unpaid Principal Balance, With no related allowance recorded | 681 | 1,799
Unpaid Principal Balance, With related allowance recorded | 161 | 789
Recorded Investment [Abstract] |  |
Recorded Investment, With no related allowance recorded | 681 | 1,799
Recorded Investment, With related allowance recorded | 161 | 789
Related Allowance [Abstract] |  |
Related Allowance | 5 | 108
Average Recorded Investment [Abstract] |  |
Average Recorded Investment, With no related allowance recorded | 1,096 | 1,575
Average Recorded Investment, With related allowance recorded | 754 | 639
Multi-family residential |  |
Unpaid Principal Balance [Abstract] |  |
Unpaid Principal Balance, With no related allowance recorded | 217 | 5
Unpaid Principal Balance, With related allowance recorded | 0 | 0
Recorded Investment [Abstract] |  |
Recorded Investment, With no related allowance recorded | 217 | 5
Recorded Investment, With related allowance recorded | 0 | 0
Related Allowance [Abstract] |  |
Related Allowance | 0 | 0
Average Recorded Investment [Abstract] |  |
Average Recorded Investment, With no related allowance recorded | 180 | 2
Average Recorded Investment, With related allowance recorded | 19 | 0
Consumer |  |
Unpaid Principal Balance [Abstract] |  |
Unpaid Principal Balance, With no related allowance recorded | 0 | 105
Unpaid Principal Balance, With related allowance recorded | 0 | 95
Recorded Investment [Abstract] |  |
Recorded Investment, With no related allowance recorded | 0 | 105
Recorded Investment, With related allowance recorded | 0 | 95
Related Allowance [Abstract] |  |
Related Allowance | 0 | 34
Average Recorded Investment [Abstract] |  |
Average Recorded Investment, With no related allowance recorded | 61 | 89
Average Recorded Investment, With related allowance recorded | 42 | 155
Agricultural |  |
Unpaid Principal Balance [Abstract] |  |
Unpaid Principal Balance, With no related allowance recorded | 397 | 15
Unpaid Principal Balance, With related allowance recorded | 0 | 0
Recorded Investment [Abstract] |  |
Recorded Investment, With no related allowance recorded | 397 | 15
Recorded Investment, With related allowance recorded | 0 | 0
Related Allowance [Abstract] |  |
Related Allowance | 0 | 0
Average Recorded Investment [Abstract] |  |
Average Recorded Investment, With no related allowance recorded | 384 | 68
Average Recorded Investment, With related allowance recorded | $ 180 | $ 2

X
- Definition Related Allowance [Abstract] + References No definition available. + Details
Name: | gnty_RelatedAllowanceAbstract
Namespace Prefix: | gnty_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5258-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

X
- Definition Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953550-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableRecordedInvestment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Definition Amount of allowance for credit losses related to recorded investment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableRelatedAllowance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Definition Amount of average investment of impaired financing receivables for which there is no related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5258-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of investment in impaired financing receivables for which there is no related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953550-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of unpaid principal balance of impaired financing receivables for which there is no related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of average investment of impaired financing receivables for which there is a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5258-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of investment in impaired financing receivables for which there is a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953550-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Unpaid principal balance of impaired financing receivables for which there is a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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