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Loans and Allowance for Loan Losses - CARES Act (Details) $ in Millions | Dec. 31, 2020 USD ($)
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Commercial Lending Customer |
Number of CARES Act Loan Modifications | 65
CARES Act Loan Modifications | $ 233
Consumer and Mortgage Loans |
Number of CARES Act Loan Modifications | 581
CARES Act Loan Modifications | $ 18

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- Definition Represents the monetary amount of CARES Act Loan Modifications, as of the indicated date. + References No definition available. + Details
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Namespace Prefix: | gsbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Represents the pure numeric value of Number of CARES Act Loan Modifications, as of the indicated date. + References No definition available. + Details
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Namespace Prefix: | gsbc_
Data Type: | xbrli:pureItemType
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_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=gsbc_ConsumerAndMortgageLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |