FDIC-Acquired Loans and Loss Sharing Agreements - Consolidated Statements of Income (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
FDIC-Acquired Loans and Loss Sharing Agreements
Interest income and net impact to pre-tax income	$ 5,574	$ 7,431	$ 5,134
Remaining accretable yield adjustment	2,000
Expected interest income	$ 1,500

Represents the monetary amount of Net impact of acquired loan pools to pre-tax income, during the indicated time period.

No definition available.

Name:	gsbc_NetImpactOfAcquiredLoanPoolsToPreTaxincome
Namespace Prefix:	gsbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration