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Derivatives and Hedging Activities - Cash Flow Hedges (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Derivatives and Hedging Activities |  |
Interest rate swap interest income | $ 7,700,000 | $ 3,100,000
Non-interest income related to changes in the fair value of derivative | 0 | $ 0
Non-interest income related to changes in the fair value of derivative | $ 45,900,000 |

X
- Definition Represents the monetary amount of Interest Rate Swap Interest Income, during the indicated time period. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the monetary amount of Noninterest income related to changes in the fair value of derivative, during the indicated time period. + References No definition available. + Details
Name: | gsbc_NoninterestIncomeRelatedToChangesInTheFairValueOfDerivative
Namespace Prefix: | gsbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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X
- Definition The net cash outflow or inflow from derivative instruments during the period, which are classified as investing activities, excluding those designated as hedging instruments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04(a)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24072-122690 + Details
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