Nature of Operations and Summary of Significant Accounting Policies - Allowance for Credit Losses (Details) - USD ($)		12 Months Ended
Jan. 01, 2021	Dec. 31, 2022
Nature of Operations and Summary of Significant Accounting Policies
TDR loans evaluated on individual	$ 100,000	$ 100,000

Amount of troubled debt restructuring loan evaluated on individual.

No definition available.

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