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EARNINGS PER SHARE (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 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	452,918	653,794	452,918	565,401

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- 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

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Namespace Prefix:	gsbc_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

Name:	us-gaap_EarningsPerShareAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration