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Loans and Allowance for Loan Losses - Impaired Loans Specific Valuation Allowance (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Loans and Allowance for Loan Losses |  |  |
Impaired Loans With Specific Valuation Allowance | $ 4,800,000 | $ 5,200,000 | $ 8,400,000
Impaired Loans Valuation Allowance | 713,000 | 929,000 | 2,000,000
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans | $ 579,000 | $ 761,000 | $ 1,000,000

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- Definition Represents the monetary amount of Impaired Loans Valuation Allowance, as of the indicated date. + References No definition available. + Details
Name: | gsbc_ImpairedLoansValuationAllowance
Namespace Prefix: | gsbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Represents the monetary amount of Impaired Loans With Specific Valuation Allowance, as of the indicated date. + References No definition available. + Details
Name: | gsbc_ImpairedLoansWithSpecificValuationAllowance
Namespace Prefix: | gsbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_LoansAndLeasesReceivableDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Reflects the amount of additional interest income that would have been recorded if impaired or nonperforming loans were instead current, in compliance with their original terms, and outstanding throughout the reporting period or since origination (if held for part of the period). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121585226&loc=d3e18794-111554 + Details
Name: | us-gaap_LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration