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Investments in Limited Partnerships - Investments in Community Development Entities (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Investments in Limited Partnerships |  |  |
Investments in Community Development Entities Net Carrying Amount | $ 481,000 | $ 567,000 |
Investments In Limited Partnerships For Federal Or Historic Tax Credits | 642,000 | 863,000 |
Usage of Investment in Community Development Entities Federal New Market Tax Credits | 100,000 | 100,000 | $ 480,000
Actual Amortization of Investment in Community Development Entities | $ 86,000 | $ 80,000 | $ 365,000
credit allowance period | 7 years |  |
Community Development Entities, Minimum Period Before Redemption | 7 years |  |
credit allowance period for federal rehabilitation/historic tax credits | 5 years |  |

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- Definition Represents the monetary amount of Actual Amortization of Investment in Community Development Entities, during the indicated time period. + References No definition available. + Details
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Namespace Prefix: | gsbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Represents the Community Development Entities, Minimum Period Before Redemption. + References No definition available. + Details
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Namespace Prefix: | gsbc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the credit allowance period. + References No definition available. + Details
Name: | gsbc_CreditAllowancePeriod
Namespace Prefix: | gsbc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the credit allowance period for federal rehabilitation/historic tax credits + References No definition available. + Details
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Namespace Prefix: | gsbc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the monetary amount of Investments in Community Development Entities Net Carrying Amount, as of the indicated date. + References No definition available. + Details
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Namespace Prefix: | gsbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
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- Definition Investments In Limited Partnerships For Federal Or Historic Tax Credits + References No definition available. + Details
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Namespace Prefix: | gsbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the monetary amount of Usage of Investment in Community Development Entities Federal New Market Tax Credits, as of the indicated date. + References No definition available. + Details
Name: | gsbc_UsageOfInvestmentInCommunityDevelopmentEntitiesFederalNewMarketTaxCredits
Namespace Prefix: | gsbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant