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v3.20.4

Investments in Limited Partnerships - Impaired Loans (Details) | 12 Months Ended
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Dec. 31, 2020
Maximum |
Summary of Investment Holdings [Line Items] |
Discount Rate For Appraisals | 40.00%
Minimum |
Summary of Investment Holdings [Line Items] |
Discount Rate For Appraisals | 10.00%

X
- Definition Represents the discount rate for appraisal. + References No definition available. + Details
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Namespace Prefix: | gsbc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |