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Nature of Operations and Summary of Significant Accounting Policies - Allowance for Credit Losses (Details) - USD ($) |  | 12 Months Ended
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Jan. 01, 2021 | Dec. 31, 2022
Nature of Operations and Summary of Significant Accounting Policies |  |
TDR loans evaluated on individual | $ 100,000 | $ 100,000

X
- Definition Amount of troubled debt restructuring loan evaluated on individual. + References No definition available. + Details
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Namespace Prefix: | gsbc_
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