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Loans and Allowance for Credit Losses - Impaired Loans Specific Valuation Allowance (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Loans and Allowance for Credit Losses
Loans and leases receivable, impaired, interest lost on nonaccrual loans	$ 681,000	$ 509,000	$ 292,000

X

- Definition

Amount of interest income would have been recognized on accrual basis for non- accrual loans.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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