Commitments and Credit Risk - Mortgage Loans in Process of Origination (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Commitments and Credit Risk
Mortgage loans in the process of origination	$ 53.5	$ 85.9

Represents the monetary amount of Mortgage loans in the process of origination, as of the indicated date.

No definition available.

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