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Premises and Equipment - Calculated amount of right of use assets and lease liabilities (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Premises and Equipment |  |
Operating leases right of use asset | $ 7,397 | $ 7,715
Operating leases right of use asset | 7,397 | 7,715
Operating leases liability | 7,599 | 7,886
Operating lease costs classified as occupancy and equipment expense (includes short-term lease costs and amortization of right of use asset) | 1,579 | 1,529
Operating cash flows from operating leases | 1,547 | 1,483
Operating leases | 618 | 74
Statement of Financial Condition |  |
Premises and Equipment |  |
Operating leases liability | $ 7,599 | $ 7,886

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- Definition Represents the monetary amount of Operating Cash Flows from Operating Leases, during the indicated time period. + References No definition available. + Details
Name: | gsbc_OperatingCashFlowsFromOperatingLeases
Namespace Prefix: | gsbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the monetary amount of Operating Lease Costs Classified as Occupancy and Equipment Expense, during the indicated time period. + References No definition available. + Details
Name: | gsbc_OperatingLeaseCostsClassifiedAsOccupancyAndEquipmentExpense
Namespace Prefix: | gsbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of present value in lessee's discounted obligation for lease payments from operating lease liabilities. + References No definition available. + Details
Name: | gsbc_OperatingLeaseLiabilities
Namespace Prefix: | gsbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Represents the monetary amount of Operating leases, during the indicated time period. + References No definition available. + Details
Name: | gsbc_OperatingLeases
Namespace Prefix: | gsbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Represents the monetary amount of Right of Use Asset, Operating Leases, during the indicated time period. + References No definition available. + Details
Name: | gsbc_RightOfUseAssetOperatingLeases
Namespace Prefix: | gsbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977 + Details
Name: | us-gaap_OperatingLeaseRightOfUseAsset
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |