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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

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- 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