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FDIC-ASSISTED ACQUIRED LOANS - Consolidated Statements of Income (Details)	6 Months Ended
	Jun. 30, 2021 USD ($)
FDIC-ASSISTED ACQUIRED LOANS
Remaining accretable yield adjustment	$ 885,000
Expected interest income	$ 453,000

X

- Definition

Represents the amount of interest income on remaining accretable yield adjustment.

+ References

No definition available.

+ Details

Name:	gsbc_InterestIncomeRemainingAccretableYieldAdjustment
Namespace Prefix:	gsbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Represents the amount of remaining accretable yield adjustment on interest income.

+ References

No definition available.

+ Details

Name:	gsbc_RemainingAccretableYieldAdjustment
Namespace Prefix:	gsbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_BusinessCombinationsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration