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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Financing Receivable, Troubled Debt Restructuring (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Interest Only |  |  | $ 1,768 |
Term |  |  | 257 | $ 16
Combination | $ 144 | $ 2,999 | 144 | 3,205
Total Modification | 144 | 2,999 | 2,169 | 3,221
Commercial business |  |  |  |
Combination |  | 22 |  | 22
Total Modification |  | 22 |  | 22
Consumer |  |  |  |
Term |  |  | 100 | 16
Combination | 10 | 1,771 | 10 | 1,847
Total Modification | 10 | 1,771 | 110 | 1,863
Commercial Real Estate |  |  |  |
Interest Only |  |  | 1,768 |
Combination |  | 559 |  | 559
Total Modification |  | 559 | 1,768 | 559
One- to four-family residential |  |  |  |
Term |  |  | 157 |
Combination | 134 | 647 | 134 | 777
Total Modification | $ 134 | $ 647 | $ 291 | $ 777

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- Definition Represents the monetary amount of Troubled Debt Restructuring Loans Interest Only, during the indicated time period. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Represents the monetary amount of Troubled Debt Restructuring Loans Modified Combination, during the indicated time period. + References No definition available. + Details
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Namespace Prefix: | gsbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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X
- Definition Represents the monetary amount of Troubled Debt Restructuring Loans Modified Term, during the indicated time period. + References No definition available. + Details
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Namespace Prefix: | gsbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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X
- Definition Represents the monetary amount of Troubled Debt Restructurings Total New Modifications, during the indicated time period. + References No definition available. + Details
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Namespace Prefix: | gsbc_
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- Details
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Namespace Prefix: |
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Balance Type: |
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X
- Details
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Namespace Prefix: |
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Balance Type: |
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X
- Details
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Period Type: |

X
- Details
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