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DERIVATIVES AND HEDGING ACTIVITIES - Cash Flow Hedges (Details) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Mar. 02, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
DERIVATIVES AND HEDGING ACTIVITIES |  |  |  |  |
Interest rate swap interest income |  | $ 2.0 | $ 2.0 | $ 6.1 | $ 5.6
Non-interest income related to changes in the fair value of derivative |  | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.0
Non-interest income related to changes in the fair value of derivative | $ 45.9 |  |  |  |

X
- Definition Represents the monetary amount of Interest Rate Swap Interest Income, during the indicated time period. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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X
- Definition Represents the monetary amount of Noninterest income related to changes in the fair value of derivative, during the indicated time period. + References No definition available. + Details
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Namespace Prefix: | gsbc_
Data Type: | xbrli:monetaryItemType
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Period Type: | duration

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- References No definition available. + Details
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Data Type: | xbrli:stringItemType
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X
- Definition The net cash outflow or inflow from derivative instruments during the period, which are classified as investing activities, excluding those designated as hedging instruments. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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