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Deposits - Additional Information (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Jun. 30, 2023
Deposits Liabilities Disclosure [Abstract]
Deposits in excess of $2,50,000	$ 15,832	$ 13,433

X

- Definition

Deposits liabilities disclosure.

+ References

No definition available.

+ Details

Name:	srbk_DepositsLiabilitiesDisclosureAbstract
Namespace Prefix:	srbk_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of time deposit liabilities, including certificates of deposit, in denominations that meet or exceed the Federal Deposit Insurance Corporation (FDIC) insurance limit.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-SubTopic 405
-Topic 942
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481047/942-405-50-1

+ Details

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