XML 58 R47.htm IDEA: XBRL DOCUMENT
v3.7.0.1

LOANS AND ALLOWANCE FOR LOAN LOSSES - Summary of Impaired Loans (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Unpaid Principal Balance [Abstract] |  |  |
Unpaid Principal Balance, With no related allowance recorded | $ 6,895 |  | $ 5,062
Unpaid Principal Balance, With related allowance recorded | 2,148 |  | 1,256
Recorded Investment | 9,043 |  | 6,318
Recorded Investment [Abstract] |  |  |
Recorded Investment, With no related allowance recorded | 6,895 |  | 5,062
Recorded Investment, With related allowance recorded | 2,148 |  | 1,256
Unpaid Principal Balance | 9,043 |  | 6,318
Related Allowance [Abstract] |  |  |
Related Allowance | 733 |  | 253
Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment, With no related allowance recorded | 8,436 |  | 3,695
Average Recorded Investment, With related allowance recorded | 1,452 |  | 4,118
Average Recorded Investment | 9,888 |  | 7,813
Interest income | 0 | $ 0 |
Cash-based interest income | 0 | $ 0 |
Commercial and industrial |  |  |
Unpaid Principal Balance [Abstract] |  |  |
Unpaid Principal Balance, With no related allowance recorded | 712 |  | 28
Unpaid Principal Balance, With related allowance recorded | 462 |  | 203
Recorded Investment [Abstract] |  |  |
Recorded Investment, With no related allowance recorded | 712 |  | 28
Recorded Investment, With related allowance recorded | 462 |  | 203
Related Allowance [Abstract] |  |  |
Related Allowance | 246 |  | 64
Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment, With no related allowance recorded | 345 |  | 809
Average Recorded Investment, With related allowance recorded | 533 |  | 3,153
Construction and development |  |  |
Unpaid Principal Balance [Abstract] |  |  |
Unpaid Principal Balance, With no related allowance recorded | 0 |  | 1,825
Recorded Investment [Abstract] |  |  |
Recorded Investment, With no related allowance recorded | 0 |  | 1,825
Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment, With no related allowance recorded | 608 |  | 172
Commercial real estate |  |  |
Unpaid Principal Balance [Abstract] |  |  |
Unpaid Principal Balance, With no related allowance recorded | 3,468 |  | 1,196
Unpaid Principal Balance, With related allowance recorded | 283 |  |
Recorded Investment [Abstract] |  |  |
Recorded Investment, With no related allowance recorded | 3,468 |  | 1,196
Recorded Investment, With related allowance recorded | 283 |  |
Related Allowance [Abstract] |  |  |
Related Allowance | 31 |  |
Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment, With no related allowance recorded | 5,177 |  | 871
Average Recorded Investment, With related allowance recorded | 173 |  |
Farmland |  |  |
Unpaid Principal Balance [Abstract] |  |  |
Unpaid Principal Balance, With no related allowance recorded | 7 |  | 89
Unpaid Principal Balance, With related allowance recorded | 163 |  | 169
Recorded Investment [Abstract] |  |  |
Recorded Investment, With no related allowance recorded | 7 |  | 89
Recorded Investment, With related allowance recorded | 163 |  | 169
Related Allowance [Abstract] |  |  |
Related Allowance | 92 |  | 47
Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment, With no related allowance recorded | 90 |  | 109
Average Recorded Investment, With related allowance recorded | 109 |  | 169
1-4 family residential |  |  |
Unpaid Principal Balance [Abstract] |  |  |
Unpaid Principal Balance, With no related allowance recorded | 1,785 |  | 1,799
Unpaid Principal Balance, With related allowance recorded | 941 |  | 789
Recorded Investment [Abstract] |  |  |
Recorded Investment, With no related allowance recorded | 1,785 |  | 1,799
Recorded Investment, With related allowance recorded | 941 |  | 789
Related Allowance [Abstract] |  |  |
Related Allowance | 139 |  | 108
Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment, With no related allowance recorded | 1,566 |  | 1,575
Average Recorded Investment, With related allowance recorded | 505 |  | 639
Multi-family residential |  |  |
Unpaid Principal Balance [Abstract] |  |  |
Unpaid Principal Balance, With no related allowance recorded | 241 |  | 5
Recorded Investment [Abstract] |  |  |
Recorded Investment, With no related allowance recorded | 241 |  | 5
Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment, With no related allowance recorded | 172 |  | 2
Consumer |  |  |
Unpaid Principal Balance [Abstract] |  |  |
Unpaid Principal Balance, With no related allowance recorded | 192 |  | 105
Unpaid Principal Balance, With related allowance recorded | 0 |  | 95
Recorded Investment [Abstract] |  |  |
Recorded Investment, With no related allowance recorded | 192 |  | 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 | 91 |  | 89
Average Recorded Investment, With related allowance recorded | 50 |  | 155
Agricultural |  |  |
Unpaid Principal Balance [Abstract] |  |  |
Unpaid Principal Balance, With no related allowance recorded | 490 |  | 15
Unpaid Principal Balance, With related allowance recorded | 299 |  | 0
Recorded Investment [Abstract] |  |  |
Recorded Investment, With no related allowance recorded | 490 |  | 15
Recorded Investment, With related allowance recorded | 299 |  | 0
Related Allowance [Abstract] |  |  |
Related Allowance | 225 |  | 0
Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment, With no related allowance recorded | 387 |  | 68
Average Recorded Investment, With related allowance recorded | $ 82 |  | $ 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 interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired. + 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)(2) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of interest income recognized on a cash-basis method of accounting that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired. + 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)(3) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableInterestIncomeCashBasisMethod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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: |