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Loans and Allowance for Credit Losses - Impaired Loans Specific Valuation Allowance (Details) - USD ($) | 12 Months Ended
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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