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Derivatives and Hedging Activities - Cash Flow Hedge on Comprehensive Income (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Amount of Gain Recognized In AOCI | Interest Rate Swap |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Interest rate swap, net of income taxes | $ (6,271) | $ 6,691 | $ 13,857

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- Definition Represents the monetary amount of Effect of derivative instruments on the statements of comprehensive income, during the indicated time period. + References No definition available. + Details
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Namespace Prefix: | gsbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- 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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateSwapMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |