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Short-Term Borrowings - Short-term borrowings (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Short-Term Borrowings
Weighted average interest rates of short-term borrowings	0.02%	1.25%
Short-term borrowings average	$ 183.5	$ 260.0
Maximum amounts outstanding of short-term borrowing	$ 318.7	$ 346.9

X

- Definition

Represents the monetary amount of Short term borrowing maximum amounts outstanding at any month end, as of the indicated date.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the monetary amount of Short-term borrowings average, as of the indicated date.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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

X

- Definition

Weighted average interest rate of short-term debt outstanding calculated at point in time.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_ShortTermDebtWeightedAverageInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant