XML 55 R45.htm IDEA: XBRL DOCUMENT
v3.22.1

LOANS AND ALLOWANCE FOR CREDIT LOSSES - Summary of Credit Exposure in Company Loan Portfolio (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 | Dec. 31, 2021
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure 2022 | $ 255,323 | $ 763,835
Credit Exposure 2021 | 676,489 | 296,556
Credit Exposure 2020 | 271,260 | 181,846
Credit Exposure 2019 | 167,230 | 133,356
Credit Exposure 2018 | 124,816 | 107,292
Credit Exposure Prior | 373,371 | 294,966
Revolving Loans Amortized Cost | 145,572 | 130,189
Total | 2,014,061 | 1,908,040
Credit Exposure 2022.Charge - offs | (68) | (285)
Credit Exposure 2021.Charge - offs | (6) | (36)
Credit Exposure 2020.Charge - offs | (40) | (242)
Credit Exposure 2019.Charge - offs |  | (155)
Credit Exposure 2018.Charge - offs |  | (589)
Credit Exposure Prior.Charge - offs |  | (273)
Credit Exposure Revolving Loans Amortized Cost.Charge - offs | (89) | (61)
Total | (203) | (1,641)
Credit Exposure 2022, Recoveries | 30 | 61
Credit Exposure 2021, Recoveries | 1 | 3
Credit Exposure 2020, Recoveries |  | 19
Credit Exposure 2019, Recoveries | 10 | 8
Credit Exposure 2018, Recoveries | 1 | 13
Credit Exposure Prior, Recoveries | 68 | 30
Credit Exposure Revolving Loans Amortized Cost, Recoveries | 6 | 21
Total | 116 | 155
Credit Exposure 2022,Current period net | (38) | (224)
Credit Exposure 2021,Current period net | (5) | (33)
Credit Exposure 2020,Current period net | (40) | (223)
Credit Exposure 2019,Current period net | 10 | (147)
Credit Exposure 2018,Current period net | 1 | (576)
Credit Exposure Prior,Current period net | 68 | (243)
Credit Exposure Revolving Loans Amortized Cost,Current period net | (83) | (40)
Total | (87) | (1,486)
Pass |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure 2022 | 255,323 | 763,519
Credit Exposure 2021 | 676,078 | 288,107
Credit Exposure 2020 | 269,889 | 181,039
Credit Exposure 2019 | 166,332 | 122,765
Credit Exposure 2018 | 114,363 | 88,616
Credit Exposure Prior | 339,546 | 279,890
Revolving Loans Amortized Cost | 145,287 | 130,109
Total | 1,966,818 | 1,854,045
Special Mention |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure 2022 |  | 76
Credit Exposure 2021 | 165 | 853
Credit Exposure 2020 | 820 | 5
Credit Exposure 2019 | 95 |
Credit Exposure 2018 | 8,921 | 5,521
Credit Exposure Prior | 14,556 | 832
Revolving Loans Amortized Cost | 250 |
Total | 24,807 | 7,287
Substandard |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure 2021 |  | 7,273
Credit Exposure 2020 | 279 | 668
Credit Exposure 2019 | 662 | 10,250
Credit Exposure 2018 | 1,259 | 13,060
Credit Exposure Prior | 17,554 | 12,626
Revolving Loans Amortized Cost |  |
Total | 19,754 | 43,877
Nonaccrual |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure 2022 |  | 240
Credit Exposure 2021 | 246 | 323
Credit Exposure 2020 | 272 | 134
Credit Exposure 2019 | 141 | 341
Credit Exposure 2018 | 273 | 95
Credit Exposure Prior | 1,715 | 1,618
Revolving Loans Amortized Cost | 35 | 80
Total | 2,682 | 2,831
Commercial and industrial |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure 2022 | 42,707 | 176,986
Credit Exposure 2021 | 97,124 | 31,798
Credit Exposure 2020 | 28,322 | 16,262
Credit Exposure 2019 | 15,568 | 6,663
Credit Exposure 2018 | 6,130 | 3,547
Credit Exposure Prior | 16,342 | 14,669
Revolving Loans Amortized Cost | 88,141 | 74,364
Total | 294,334 | 324,289
Credit Exposure 2020.Charge - offs | (30) | (168)
Credit Exposure 2019.Charge - offs |  | (67)
Credit Exposure 2018.Charge - offs |  | (115)
Credit Exposure Revolving Loans Amortized Cost.Charge - offs | (89) | (61)
Total | (119) | (411)
Credit Exposure Prior, Recoveries | 33 |
Credit Exposure Revolving Loans Amortized Cost, Recoveries | 6 | 21
Total | 39 | 21
Credit Exposure 2020,Current period net | (30) | (168)
Credit Exposure 2019,Current period net |  | (67)
Credit Exposure 2018,Current period net |  | (115)
Credit Exposure Prior,Current period net | 33 |
Credit Exposure Revolving Loans Amortized Cost,Current period net | (83) | (40)
Total | (80) | (390)
Commercial and industrial | Pass |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure 2022 | 42,707 | 176,972
Credit Exposure 2021 | 96,935 | 31,337
Credit Exposure 2020 | 27,986 | 16,207
Credit Exposure 2019 | 14,909 | 6,449
Credit Exposure 2018 | 5,920 | 3,493
Credit Exposure Prior | 16,305 | 14,657
Revolving Loans Amortized Cost | 88,106 | 74,364
Total | 292,868 | 323,479
Commercial and industrial | Special Mention |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure 2021 | 156 | 88
Credit Exposure 2018 |  | 14
Total | 156 | 102
Commercial and industrial | Substandard |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure 2021 |  | 272
Credit Exposure 2020 | 265 | 55
Credit Exposure 2019 | 659 | 192
Credit Exposure 2018 | 210 | 40
Credit Exposure Prior | 37 | 1
Total | 1,171 | 560
Commercial and industrial | Nonaccrual |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure 2022 |  | 14
Credit Exposure 2021 | 33 | 101
Credit Exposure 2020 | 71 |
Credit Exposure 2019 |  | 22
Credit Exposure Prior |  | 11
Revolving Loans Amortized Cost | 35 |
Total | 139 | 148
Construction and development |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure 2022 | 42,538 | 180,056
Credit Exposure 2021 | 176,595 | 68,765
Credit Exposure 2020 | 49,089 | 21,108
Credit Exposure 2019 | 18,242 | 6,509
Credit Exposure 2018 | 6,120 | 9,179
Credit Exposure Prior | 19,491 | 13,565
Revolving Loans Amortized Cost | 5,960 | 8,615
Total | 318,035 | 307,797
Credit Exposure Prior, Recoveries |  | 1
Total |  | 1
Credit Exposure Prior,Current period net |  | 1
Total |  | 1
Construction and development | Pass |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure 2022 | 42,538 | 180,056
Credit Exposure 2021 | 176,595 | 68,765
Credit Exposure 2020 | 48,275 | 20,499
Credit Exposure 2019 | 18,242 | 6,507
Credit Exposure 2018 | 6,119 | 8,235
Credit Exposure Prior | 18,559 | 13,565
Revolving Loans Amortized Cost | 5,960 | 8,615
Total | 316,288 | 306,242
Construction and development | Special Mention |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure 2021 | 0 |
Credit Exposure 2020 | 814 |
Credit Exposure 2018 | 0 | 944
Credit Exposure Prior | 932 |
Total | 1,746 | 944
Construction and development | Substandard |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure 2020 | 0 | 609
Credit Exposure 2019 | 0 | 2
Credit Exposure 2018 | 1 |
Total | 1 | 611
Commercial real estate |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure 2022 | 67,507 | 134,617
Credit Exposure 2021 | 137,731 | 101,558
Credit Exposure 2020 | 104,126 | 80,857
Credit Exposure 2019 | 76,201 | 69,490
Credit Exposure 2018 | 67,158 | 61,020
Credit Exposure Prior | 204,960 | 159,155
Revolving Loans Amortized Cost | 16,875 | 16,145
Total | 674,558 | 622,842
Credit Exposure 2020.Charge - offs |  | (17)
Credit Exposure 2019.Charge - offs |  | (56)
Credit Exposure 2018.Charge - offs |  | (472)
Credit Exposure Prior.Charge - offs |  | (271)
Total |  | (816)
Credit Exposure 2020, Recoveries |  | 19
Credit Exposure 2018, Recoveries | 1 | 11
Total | 1 | 30
Credit Exposure 2020,Current period net |  | 2
Credit Exposure 2019,Current period net |  | (56)
Credit Exposure 2018,Current period net | 1 | (461)
Credit Exposure Prior,Current period net |  | (271)
Total | 1 | (786)
Commercial real estate | Pass |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure 2022 | 67,507 | 134,617
Credit Exposure 2021 | 137,731 | 93,806
Credit Exposure 2020 | 104,126 | 80,733
Credit Exposure 2019 | 76,086 | 59,380
Credit Exposure 2018 | 57,139 | 43,457
Credit Exposure Prior | 173,813 | 145,477
Revolving Loans Amortized Cost | 16,875 | 16,065
Total | 633,277 | 573,535
Commercial real estate | Special Mention |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure 2022 | 0 |
Credit Exposure 2021 |  | 765
Credit Exposure 2020 | 0 |
Credit Exposure 2019 | 0 |
Credit Exposure 2018 | 8,921 | 4,550
Credit Exposure Prior | 13,406 | 788
Total | 22,327 | 6,103
Commercial real estate | Substandard |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure 2021 | 0 | 6,987
Credit Exposure 2020 | 0 | 0
Credit Exposure 2019 | 0 | 10,041
Credit Exposure 2018 | 1,034 | 12,981
Credit Exposure Prior | 17,415 | 12,553
Total | 18,449 | 42,562
Commercial real estate | Nonaccrual |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure 2021 | 0 | 0
Credit Exposure 2020 |  | 124
Credit Exposure 2019 | 115 | 69
Credit Exposure 2018 | 64 | 32
Credit Exposure Prior | 326 | 337
Revolving Loans Amortized Cost |  | 80
Total | 505 | 642
Farmland |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure 2022 | 45,866 | 94,491
Credit Exposure 2021 | 92,766 | 12,063
Credit Exposure 2020 | 12,681 | 8,664
Credit Exposure 2019 | 7,915 | 7,456
Credit Exposure 2018 | 7,375 | 5,191
Credit Exposure Prior |  | 11,346
Revolving Loans Amortized Cost | 5,914 | 6,290
Total | 186,982 | 145,501
Credit Exposure Prior,Current period net | 14,465 |
Farmland | Pass |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure 2022 | 45,866 | 94,491
Credit Exposure 2021 | 92,766 | 11,868
Credit Exposure 2020 | 12,486 | 8,664
Credit Exposure 2019 | 7,915 | 7,456
Credit Exposure 2018 | 7,375 | 5,191
Credit Exposure Prior | 14,292 | 11,145
Revolving Loans Amortized Cost | 5,914 | 6,290
Total | 186,614 | 145,105
Farmland | Special Mention |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure Prior |  | 26
Total |  | 26
Farmland | Substandard |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure Prior | 70 | 72
Total | 70 | 72
Farmland | Nonaccrual |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure 2021 | 195 | 195
Credit Exposure Prior | 103 | 103
Revolving Loans Amortized Cost | 0 |
Total | 298 | 298
1-4 family residential |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure 2022 | 35,231 | 132,618
Credit Exposure 2021 | 132,103 | 64,590
Credit Exposure 2020 | 63,134 | 43,016
Credit Exposure 2019 | 38,347 | 36,681
Credit Exposure 2018 | 32,316 | 27,045
Credit Exposure Prior | 113,957 | 93,009
Revolving Loans Amortized Cost | 15,667 | 13,714
Total | 430,755 | 410,673
Credit Exposure Prior, Recoveries | 30 |
Total | 30 |
Credit Exposure Prior,Current period net | 30 |
Total | 30 |
1-4 family residential | Pass |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure 2022 | 35,231 | 132,448
Credit Exposure 2021 | 131,940 | 64,590
Credit Exposure 2020 | 63,134 | 43,016
Credit Exposure 2019 | 38,256 | 36,501
Credit Exposure 2018 | 32,144 | 26,987
Credit Exposure Prior | 112,524 | 91,864
Revolving Loans Amortized Cost | 15,667 | 13,714
Total | 428,896 | 409,120
1-4 family residential | Special Mention |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure 2019 | 91 |
Credit Exposure Prior | 203 | 18
Total | 294 | 18
1-4 family residential | Nonaccrual |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure 2022 |  | 170
Credit Exposure 2021 | 163 |
Credit Exposure 2020 | 0 |
Credit Exposure 2019 |  | 180
Credit Exposure 2018 | 172 | 58
Credit Exposure Prior | 1,230 | 1,127
Total | 1,565 | 1,535
Multi-family residential |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure 2022 | 12,469 | 16,663
Credit Exposure 2021 | 16,723 | 4,286
Credit Exposure 2020 | 2,742 | 6,436
Credit Exposure 2019 | 6,385 | 908
Credit Exposure 2018 | 900 | 474
Credit Exposure Prior | 2,501 | 2,113
Revolving Loans Amortized Cost | 301 | 91
Total | 42,021 | 30,971
Multi-family residential | Pass |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure 2022 | 12,469 | 16,663
Credit Exposure 2021 | 16,723 | 4,286
Credit Exposure 2020 | 2,742 | 6,436
Credit Exposure 2019 | 6,385 | 908
Credit Exposure 2018 | 900 | 474
Credit Exposure Prior | 2,501 | 2,113
Revolving Loans Amortized Cost | 301 | 91
Total | 42,021 | 30,971
Multi-family residential | Nonaccrual |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure Prior, Recoveries | 0 |
Total | 0 |
Consumer and Overdrafts |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure 2022 | 8,612 | 24,847
Credit Exposure 2021 | 20,495 | 11,616
Credit Exposure 2020 | 9,563 | 4,572
Credit Exposure 2019 | 3,739 | 4,709
Credit Exposure 2018 | 3,996 | 563
Credit Exposure Prior | 943 | 543
Revolving Loans Amortized Cost | 5,625 | 4,478
Total | 52,973 | 51,328
Credit Exposure 2022.Charge - offs | (68) | (285)
Credit Exposure 2021.Charge - offs | (6) | (36)
Credit Exposure 2020.Charge - offs | (10) | (57)
Credit Exposure 2019.Charge - offs |  | (32)
Credit Exposure 2018.Charge - offs |  | (2)
Credit Exposure Prior.Charge - offs |  | (2)
Total | (84) | (414)
Credit Exposure 2022, Recoveries | 30 | 61
Credit Exposure 2021, Recoveries | 1 | 3
Credit Exposure 2019, Recoveries | 10 | 8
Credit Exposure 2018, Recoveries |  | 2
Credit Exposure Prior, Recoveries | 5 | 21
Total | 46 | 95
Credit Exposure 2022,Current period net | (38) | (224)
Credit Exposure 2021,Current period net | (5) | (33)
Credit Exposure 2020,Current period net | (10) | (57)
Credit Exposure 2019,Current period net | 10 | (24)
Credit Exposure Prior,Current period net | 5 | 19
Total | (38) | (319)
Consumer and Overdrafts | Pass |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure 2022 | 8,612 | 24,715
Credit Exposure 2021 | 20,436 | 11,589
Credit Exposure 2020 | 9,551 | 4,557
Credit Exposure 2019 | 3,709 | 4,647
Credit Exposure 2018 | 3,965 | 558
Credit Exposure Prior | 931 | 543
Revolving Loans Amortized Cost | 5,375 | 4,478
Total | 52,579 | 51,087
Consumer and Overdrafts | Special Mention |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure 2022 |  | 76
Credit Exposure 2021 | 9 |
Credit Exposure 2020 | 6 | 5
Credit Exposure 2019 | 4 |
Credit Exposure Prior | 9 |
Revolving Loans Amortized Cost | 250 |
Total | 278 | 81
Consumer and Overdrafts | Nonaccrual |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure 2022 |  | 56
Credit Exposure 2021 | 50 | 27
Credit Exposure 2020 | 6 | 10
Credit Exposure 2019 | 26 | 62
Credit Exposure 2018 | 31 | 5
Credit Exposure Prior | 3 |
Total | 116 | 160
Agricultural |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure 2022 | 393 | 3,557
Credit Exposure 2021 | 2,952 | 1,880
Credit Exposure 2020 | 1,603 | 931
Credit Exposure 2019 | 833 | 940
Credit Exposure 2018 | 821 | 273
Credit Exposure Prior | 712 | 566
Revolving Loans Amortized Cost | 7,089 | 6,492
Total | 14,403 | 14,639
Total |  | (8)
Credit Exposure Prior, Recoveries |  | 8
Credit Exposure Prior,Current period net |  | 8
Total |  | 8
Agricultural | Pass |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure 2022 | 393 | 3,557
Credit Exposure 2021 | 2,952 | 1,866
Credit Exposure 2020 | 1,589 | 927
Credit Exposure 2019 | 830 | 917
Credit Exposure 2018 | 801 | 221
Credit Exposure Prior | 621 | 526
Revolving Loans Amortized Cost | 7,089 | 6,492
Total | 14,275 | 14,506
Agricultural | Special Mention |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure 2018 |  | 13
Credit Exposure Prior | 6 |
Total | 6 | 13
Agricultural | Substandard |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure 2021 |  | 14
Credit Exposure 2020 | 14 | 4
Credit Exposure 2019 | 3 | 15
Credit Exposure 2018 | 14 | 39
Credit Exposure Prior | 32 |
Total | 63 | 72
Agricultural | Nonaccrual |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure 2019 |  | 8
Credit Exposure 2018 | 6 |
Credit Exposure Prior | 53 | 40
Total | $ 59 | $ 48

X
- Definition Financing Receivable After Deferred Income. + References No definition available. + Details
Name: | gnty_FinancingReceivableAfterDeferredIncome
Namespace Prefix: | gnty_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Financing receivable allowance for credit loss writeoffs after recoveries five or more years before latest fiscal year. + References No definition available. + Details
Name: | gnty_FinancingReceivableAllowanceForCreditLossWriteOffsAfterRecoveriesFiveOrMoreYearsBeforeLatestFiscalYear
Namespace Prefix: | gnty_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Financing receivable allowance for credit loss writeoffs after recoveries in fiscal year before latest fiscal year. + References No definition available. + Details
Name: | gnty_FinancingReceivableAllowanceForCreditLossWriteOffsAfterRecoveriesInFiscalYearBeforeLatestFiscalYear
Namespace Prefix: | gnty_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Financing receivable allowance for credit loss writeoffs after recoveries four years before latest fiscal year. + References No definition available. + Details
Name: | gnty_FinancingReceivableAllowanceForCreditLossWriteOffsAfterRecoveriesInFourYearsBeforeLatestFiscalYear
Namespace Prefix: | gnty_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Financing receivable allowance for credit loss writeoffs after recoveries three years before latest fiscal year. + References No definition available. + Details
Name: | gnty_FinancingReceivableAllowanceForCreditLossWriteOffsAfterRecoveriesInThreeYearsBeforeLatestFiscalYear
Namespace Prefix: | gnty_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Financing receivable allowance for credit loss writeoffs after recoveries revolving loans. + References No definition available. + Details
Name: | gnty_FinancingReceivableAllowanceForCreditLossWriteOffsAfterRecoveriesRevolvingLoans
Namespace Prefix: | gnty_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Financing receivable allowance for credit loss writeoffs after recoveries two years before latest fiscal year. + References No definition available. + Details
Name: | gnty_FinancingReceivableAllowanceForCreditLossWriteOffsAfterRecoveriesTwoYearsBeforeLatestFiscalYear
Namespace Prefix: | gnty_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Financing receivable, allowance for credit loss, writeoff, after net recovery (net charge-off). + References No definition available. + Details
Name: | gnty_FinancingReceivableAllowanceForCreditLossWriteoffAfterNetRecoveryNetChargeOff
Namespace Prefix: | gnty_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Financing receivable allowance for credit losses recoveries five or more years before latest fiscal year. + References No definition available. + Details
Name: | gnty_FinancingReceivableAllowanceForCreditLossesRecoveriesFiveOrMoreYearsBeforeLatestFiscalYear
Namespace Prefix: | gnty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Financing receivable allowance for credit losses recoveries four years before latest fiscal year. + References No definition available. + Details
Name: | gnty_FinancingReceivableAllowanceForCreditLossesRecoveriesFourYearsBeforeLatestFiscalYear
Namespace Prefix: | gnty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Financing receivable allowance for credit losses recoveries In current fiscal year. + References No definition available. + Details
Name: | gnty_FinancingReceivableAllowanceForCreditLossesRecoveriesInCurrentFiscalYear
Namespace Prefix: | gnty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Financing receivable allowance for credit losses recoveries three years before latest fiscal year. + References No definition available. + Details
Name: | gnty_FinancingReceivableAllowanceForCreditLossesRecoveriesThreeYearsBeforeLatestFiscalYear
Namespace Prefix: | gnty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Financing receivable allowance for credit losses recoveries two years before latest fiscal year. + References No definition available. + Details
Name: | gnty_FinancingReceivableAllowanceForCreditLossesRecoveriesTwoYearsBeforeLatestFiscalYear
Namespace Prefix: | gnty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Financing receivable allowance for credit losses revolving loans amortized cost. + References No definition available. + Details
Name: | gnty_FinancingReceivableAllowanceForCreditLossesRevolvingLoansAmortizedCost
Namespace Prefix: | gnty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Financing receivable allowance for credit losses writeoffs five or more years before latest fiscal year. + References No definition available. + Details
Name: | gnty_FinancingReceivableAllowanceForCreditLossesWriteOffsFiveOrMoreYearsBeforeLatestFiscalYear
Namespace Prefix: | gnty_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Financing receivable allowance for credit losses writeoffs four years before latest fiscal year. + References No definition available. + Details
Name: | gnty_FinancingReceivableAllowanceForCreditLossesWriteOffsFourYearsBeforeLatestFiscalYear
Namespace Prefix: | gnty_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Financing receivable allowance for credit losses writeOffs In current fiscal year. + References No definition available. + Details
Name: | gnty_FinancingReceivableAllowanceForCreditLossesWriteOffsInCurrentFiscalYear
Namespace Prefix: | gnty_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Financing receivable allowance for credit losses writeoffs in fiscal year before latest fiscal year. + References No definition available. + Details
Name: | gnty_FinancingReceivableAllowanceForCreditLossesWriteOffsInFiscalYearBeforeLatestFiscalYear
Namespace Prefix: | gnty_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Financing receivable allowance for credit losses writeoffs revolving. + References No definition available. + Details
Name: | gnty_FinancingReceivableAllowanceForCreditLossesWriteOffsRevolving
Namespace Prefix: | gnty_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Financing receivable allowance for credit losses writeoffs three years before latest fiscal year. + References No definition available. + Details
Name: | gnty_FinancingReceivableAllowanceForCreditLossesWriteOffsThreeYearsBeforeLatestFiscalYear
Namespace Prefix: | gnty_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Financing receivable allowance for credit losses writeoffs two years before latest fiscal year. + References No definition available. + Details
Name: | gnty_FinancingReceivableAllowanceForCreditLossesWriteOffsTwoYearsBeforeLatestFiscalYear
Namespace Prefix: | gnty_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Financing receivable allowance for credit losses writeoffs after recoveries in current fiscal year. + References No definition available. + Details
Name: | gnty_FinancingReceivableAllowanceForCreditLossesWriteoffsAfterRecoveriesInCurrentFiscalYear
Namespace Prefix: | gnty_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Financing receivable allowance for credit losses recoveries in fiscal year before latest fiscal year. + References No definition available. + Details
Name: | gnty_FinancingReceivableAllowanceForCreditRecoveriesInFiscalYearBeforeLatestFiscalYear
Namespace Prefix: | gnty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of increase in allowance for credit loss on financing receivable from recovery. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of writeoff of financing receivable, charged against allowance for credit loss. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of financing receivable originated more than five years prior to current fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919232-210447 + Details
Name: | us-gaap_FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of financing receivable originated four years prior to current fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919232-210447 + Details
Name: | us-gaap_FinancingReceivableOriginatedFourYearsBeforeLatestFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of financing receivable originated in current fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919232-210447 + Details
Name: | us-gaap_FinancingReceivableOriginatedInCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of financing receivable originated in fiscal year prior to current fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919232-210447 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448 + Details
Name: | us-gaap_FinancingReceivableOriginatedInFiscalYearBeforeLatestFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of financing receivable originated three years prior to current fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919232-210447 + Details
Name: | us-gaap_FinancingReceivableOriginatedThreeYearsBeforeLatestFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of financing receivable originated two years prior to current fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919232-210447 + Details
Name: | us-gaap_FinancingReceivableOriginatedTwoYearsBeforeLatestFiscalYear
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_FinancingReceivableRecordedInvestmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of financing receivable that can be withdrawn, repaid and redrawn. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919232-210447 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448 + Details
Name: | us-gaap_FinancingReceivableRevolving
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_PassMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_SpecialMentionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_SubstandardMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_DoubtfulMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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=gnty_ConsumerAndUnallocatedPortfolioSegmentsMember
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: |