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DERIVATIVES AND HEDGING ACTIVITIES - Agreements with Derivative Counterparties (Details) - USD ($)	Sep. 30, 2023	Dec. 31, 2022
Loan level swaps
DERIVATIVES AND HEDGING ACTIVITIES
Derivative counterparties collateral	$ 25,900,000	$ 20,700,000
Commercial lending swaps
DERIVATIVES AND HEDGING ACTIVITIES
Derivative counterparties collateral	11,300,000
Interest rate swaps
DERIVATIVES AND HEDGING ACTIVITIES
Derivative counterparties collateral	36,200,000
Swaps related to brokered deposits
DERIVATIVES AND HEDGING ACTIVITIES
Collateral from the Company	834,000
Net asset position | Balance sheet hedge
DERIVATIVES AND HEDGING ACTIVITIES
Termination value of derivatives with derivative dealer counterparties	$ 240,000	$ 242,000

X

- Definition

Represents the monetary amount of derivative counterparties collateral, as of the indicated date.

+ References

No definition available.

+ Details

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

X

- Definition

The amount of collateral from the entity.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the monetary amount of termination value of derivatives with derivative dealer counterparties, as of the indicated date.

+ References

No definition available.

+ Details

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

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: