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EARNINGS PER SHARE (Details) - shares | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
EARNINGS PER SHARE |  |
Options to purchase shares of common stock outstanding not included in computation of diluted earnings per share because exercise price greater than average market price | 352,488 | 568,551

X
- Definition Represents the Options to purchase shares of common stock outstanding not included in computation of diluted earnings per share because exercise price greater than average market price (number of shares), during the indicated time period. + References No definition available. + Details
Name: | gsbc_OptionsToPurchaseSharesOfCommonStockOutstandingNotIncludedInComputationOfDilutedEarningsPerShareBecauseExercisePriceGreaterThanAverageMarketPrice
Namespace Prefix: | gsbc_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_EarningsPerShareAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration