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PREMISES AND EQUIPMENT- Calculated Amount of Right of Use Assets and Lease Liabilities (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021
Operating leases liability | $ 7,672 |  | $ 7,900
Statement of Financial Condition |  |  |
Operating leases right of use asset | 7,493 |  | 7,716
Operating leases liability | 7,672 |  | $ 7,886
Statement of Income |  |  |
Operating lease costs classified as occupancy and equipment expense (includes short-term lease costs and amortization of right of use asset) | 369 | $ 374 |
Supplemental Cash Flow Information |  |  |
Operating cash flows from operating leases | $ 360 | $ 361 |

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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

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- 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

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- 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

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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

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

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

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