Nature of Operations and Summary of Significant Accounting Policies - Restrictions on Cash and Due From Banks (Details) - USD ($)	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Nature of Operations and Summary of Significant Accounting Policies
Federal Reserve Bank Reserve Fund	$ 0	$ 0

Represents the monetary amount of Federal Reserve Bank Reserve Fund, as of the indicated date.

No definition available.

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