Liability for credit losses for unfunded commitments.

No definition available.

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

- Definition

Minimum percentage of loan to value ratio required to keep credit risk minimal.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

Minimum percentage required for loan grant for residential mortgage loan to value ratio.

+ References

No definition available.

+ Details

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Namespace Prefix:	srbk_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Provision for unfunded commitments

+ References

No definition available.

+ Details

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

- 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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-13

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph c
-Publisher SEC

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration

- Definition

The increase (decrease) during the reporting period in net unamortized loan origination fees and other fees that are collected at origination but recorded as income over the life of the loan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (a)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-28

+ Details

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

- Definition

Carrying amount as of the balance sheet date of land and buildings obtained through foreclosure proceedings or defeasance in full or partial satisfaction of a debt arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481990/310-10-45-3

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 11
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-11

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Balance Type:	debit
Period Type:	instant

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Loans Receivable - Additional Information (Details) - USD ($)	3 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Jul. 01, 2023	Jun. 30, 2023
Financing Receivable, Allowance for Credit Loss [Line Items]
Minimum percentage of loan to value ratio required to keep credit risk minimal	80.00%
Minimum percentage required for loan grant for residential mortgage loan to value ratio	80.00%
Nonaccrual loans additional income	$ 4,000	$ 13,000
Liability for credit losses for unfunded commitments	16,000		$ 1,000
Provision for unfunded commitments	15,000
Foreclosed real estate owned	$ 0			$ 0
ASU 2016-13
Financing Receivable, Allowance for Credit Loss [Line Items]
Liability for credit losses for unfunded commitments			$ 1,000