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SECURITIES SOLD UNDER REVERSE REPURCHASE AGREEMENTS AND SHORT-TERM BORROWINGS - Schedule of Short-term Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
SECURITIES SOLD UNDER REVERSE REPURCHASE AGREEMENTS AND SHORT-TERM BORROWINGS
Notes payable - Community Development Equity Funds	$ 1,183	$ 1,518
Securities sold under reverse repurchase agreements	158,367	164,174
Short-term debt recorded value	$ 159,550	$ 165,692

X

- Definition

Represents the monetary amount of Notes payable - Community Development Equity Funds, as of the indicated date.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the monetary amount of Short-term debt recorded value, as of the indicated date.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

Name:	us-gaap_DebtDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The carrying value of securities purchased to be resold in reverse repurchase transactions as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	us-gaap_SecuritiesForReverseRepurchaseAgreements
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant