XML 58 R47.htm IDEA: XBRL DOCUMENT
v3.20.2

LOANS AND ALLOWANCE FOR CREDIT LOSSES - Narrative (Details) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2020 USD ($) contract | Jun. 30, 2019 contract | Dec. 31, 2019 USD ($) contract
Receivables [Abstract] |  |  |
Loans classified in doubtful or loss risk rating | $ 0 |  | $ 0
Number of loans modified as TDRs | contract | 0 | 4 | 4
Increase in allowance for loan losses due to TDRs |  |  | $ 0
Troubled debt restructuring charge-offs |  |  | $ 0

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 Loans classified in doubtful and loss risk rating. + References No definition available. + Details
Name: | gnty_LoansClassifiedInDoubtfulAndLossRiskRating
Namespace Prefix: | gnty_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524 + Details
Name: | us-gaap_FinancingReceivableModificationsNumberOfContracts2
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Reflects the amount of the write-down related to a troubled debt restructuring. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121585226&loc=d3e18845-111554 + Details
Name: | us-gaap_FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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