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Borrowings - Additional Information (Details)	1 Months Ended	3 Months Ended	12 Months Ended
	Mar. 31, 2023 USD ($)	Sep. 30, 2023 USD ($)	Jun. 30, 2023 USD ($)
FHLB-NY
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Borrowings		$ 0	$ 0
Authorized borrowings		100,000,000	100,000,000
FRB-NY
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Authorized borrowings		25,000,000	25,000,000
Federal Reserve Bank Term Funding Program
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Federal reserve basis points	10
Federal reserve prepayment penalties	$ 0
Federal reserve advance		$ 20,000,000	$ 20,000,000
Federal reserve advance interest rate		4.76%	4.76%
Federal reserve advance maturity date		Mar. 29, 2024

X

- Definition

Federal reserve advance.

+ References

No definition available.

+ Details

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Namespace Prefix:	srbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Federal reserve advance interest rate.

+ References

No definition available.

+ Details

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Namespace Prefix:	srbk_
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Balance Type:	na
Period Type:	duration

X

- Definition

Federal reserve advance maturity date.

+ References

No definition available.

+ Details

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Namespace Prefix:	srbk_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Federal reserve prepayment penalties.

+ References

No definition available.

+ Details

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Namespace Prefix:	srbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Federal reserve Variable interest rate.

+ References

No definition available.

+ Details

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Namespace Prefix:	srbk_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Maximum authorized amount of borrowings.

+ References

No definition available.

+ Details

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Namespace Prefix:	srbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 470
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480876/942-470-45-1

+ Details

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

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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- Details

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X

- Details

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Namespace Prefix:
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X

- Details

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