Commitments and Credit Risk - Outstanding Commitments to Originate Loans (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Commitments and Credit Risk
Outstanding commitments to originate loans	$ 159.7	$ 46.6

Represents the monetary amount of Outstanding commitments to originate loans, as of the indicated date.

No definition available.

Name:	gsbc_OutstandingCommitmentsToOriginateLoans
Namespace Prefix:	gsbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant