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PREMISES AND EQUIPMENT - Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
PREMISES AND EQUIPMENT
Land	$ 40,239	$ 40,250
Buildings and improvements	110,796	110,536
Furniture, fixtures and equipment	71,881	72,121
Operating leases right of use asset	$ 3,878	$ 4,161
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Prepaid Expense and Other Assets	Prepaid Expense and Other Assets
Premises and equipment, gross	$ 226,794	$ 227,068
Less: accumulated depreciation	94,681	93,811
Total premises and equipment	$ 132,113	$ 133,257

X

- Definition

Amount of accumulated depreciation and amortization from plant, property, and equipment and right-of-use asset from finance lease.

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	instant

X

- Definition

The amount of accumulated depreciation and amortization, of property, plant, and equipment and operating lease right-of-use asset.

+ References

No definition available.

+ Details

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Balance Type:	debit
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X

- Definition

Amount, before accumulated depreciation and amortization, of property, plant, and equipment and operating lease right-of-use asset.

+ References

No definition available.

+ Details

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Namespace Prefix:	gsbc_
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X

- Definition

Amount before accumulated depreciation of equipment commonly used in offices and stores that have no permanent connection to the structure of a building or utilities. Examples include, but are not limited to, desks, chairs, tables, and bookcases.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 360
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482099/360-10-50-1

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Balance Type:	debit
Period Type:	instant

X

- Definition

Carrying amount as of the balance sheet date of building structures held as inventory including any additions, improvements, or renovations to those structures.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(6)(a))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

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Balance Type:	debit
Period Type:	instant

X

- Definition

Amount before accumulated depletion of real estate held for productive use, excluding land held for sale.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(13))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

+ Details

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

X

- Definition

Amount of lessee's right to use underlying asset under operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479041/842-20-45-1

+ Details

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

X

- Definition

Indicates line item in statement of financial position that includes operating lease right-of-use asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479041/842-20-45-2

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Period Type:	instant

X

- References

No definition available.

+ Details

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