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Deposits - Originated Certificates of Deposit and Brokered Deposits (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Deposits
Amount of certificates of deposit greater than $100,000 originated	$ 762.9	$ 830.8
Amount of certificates of deposit greater than $250,000 originated	123.1	153.1
Interest-bearing Domestic Deposit, Brokered	$ 158.7	$ 371.7

X

- Definition

Represents the monetary amount of Amount of certificates of deposit greater than $100,000 originated, as of the indicated date.

+ References

No definition available.

+ Details

Name:	gsbc_AmountOfCertificatesOfDepositGreaterThan100000Originated
Namespace Prefix:	gsbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Represents the monetary amount of Amount of certificates of deposit greater than $250,000 originated, as of the indicated date.

+ References

No definition available.

+ Details

Name:	gsbc_AmountOfCertificatesOfDepositGreaterThan250000Originated
Namespace Prefix:	gsbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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

X

- Definition

Amount of interest-bearing domestic third-party deposits placed by or through the assistance of a deposit broker, also known as brokered deposit liabilities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.12)
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

+ Details

Name:	us-gaap_InterestBearingDomesticDepositBrokered
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant