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Loans and Allowance for Loan Losses - CARES Act (Details) $ in Millions	Dec. 31, 2020 USD ($)
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

Name:	gsbc_CaresActLoanModifications
Namespace Prefix:	gsbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Represents the pure numeric value of Number of CARES Act Loan Modifications, as of the indicated date.

+ References

No definition available.

+ Details

Name:	gsbc_NumberOfCaresActLoanModifications
Namespace Prefix:	gsbc_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=gsbc_CommercialLendingCustomerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=gsbc_ConsumerAndMortgageLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: