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CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Jun. 30, 2022 | Dec. 31, 2022 | Dec. 31, 2021
Statement of Cash Flows [Abstract] |  |  |
Available for sale securities transferred to held to maturity, net of unrealized loss | $ 13,186 | $ 13,186 | $ 10,235

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- Definition Available for sale securities transferred to held to maturity, net of unrealized loss + References No definition available. + Details
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Namespace Prefix: | gnty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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