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Derivatives and Hedging Activities - Cash Flow Hedges (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Derivatives and Hedging Activities
Interest rate swap interest income	$ 7,700,000	$ 3,100,000
Non-interest income related to changes in the fair value of derivative	0	$ 0
Non-interest income related to changes in the fair value of derivative	$ 45,900,000

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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Namespace Prefix:	gsbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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

Name:	gsbc_NoninterestIncomeRelatedToChangesInTheFairValueOfDerivative
Namespace Prefix:	gsbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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

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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-04(a))
-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24072-122690

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration