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Commitments and Credit Risk - Lines of Credit (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Letters of Credit Outstanding, Amount	$ 16.1	$ 26.3
Commercial Lines of Credit
Letters of Credit Outstanding, Amount	1,000.0	1,200.0
Openend Consumer Lines of Credit
Letters of Credit Outstanding, Amount	$ 164.5	$ 155.8

X

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

Name:	us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=gsbc_CommercialLinesOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=gsbc_OpenendConsumerLinesOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: