OTHER REAL ESTATE OWNED AND REPOSSESSIONS - Schedule of Expenses Applicable to Foreclosed Assets (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
OTHER REAL ESTATE OWNED AND REPOSSESSIONS
Net gains on sales of other real estate owned and repossessions	$ (1)	$ (348)	$ (169)	$ (450)
Valuation write-downs		269	83	482
Operating expenses, net of rental income	104	278	559	914
Expenses on real estate and repossessions	$ 103	$ 199	$ 473	$ 946

Represents the monetary amount of Net (gain) loss on sales of other real estate owned, during the indicated time period.

No definition available.

Name:	gsbc_NetGainLossOnSalesOfOtherRealEstateOwned
Namespace Prefix:	gsbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration