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Premises and Equipment - Calculated Amount of Right of Use Assets and Lease Liabilities (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Operating leases right of use asset | $ 7,716 | $ 8,536
Operating leases liability | 7,886 | 8,661
Operating lease costs classified as occupancy and equipment expense | 1,529 | 1,572
Operating cash flows from operating leases | 1,483 | 1,526
Operating leases | 74 | 972
Statement of Financial Condition |  |
Operating leases liability | $ 7,886 | $ 8,661

X
- 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 Present value of 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

X
- 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

X
- 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
- Details
Name: | gsbc_StatementOfFinancialPositionAxis=gsbc_StatementOfFinancialConditionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |