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Loans Receivable And Allowance For Loan Losses - Amortized Cost of Collateral Dependent Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Mar. 31, 2023
Financing Receivable, Allowance for Credit Loss [Line Items]
Recorded Investment	$ 4,518	$ 4,009
Related ACL	123	123
Collateral Pledged
Financing Receivable, Allowance for Credit Loss [Line Items]
Recorded Investment	3,605
Related ACL	361
One-to four-family
Financing Receivable, Allowance for Credit Loss [Line Items]
Recorded Investment	378	368
Related ACL	0	0
One-to four-family | Collateral Pledged
Financing Receivable, Allowance for Credit Loss [Line Items]
Recorded Investment	380
Related ACL	0
Commercial real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Recorded Investment	3,006	2,973
Related ACL	0	0
Commercial real estate | Collateral Pledged
Financing Receivable, Allowance for Credit Loss [Line Items]
Recorded Investment	1,149
Related ACL	28
Construction-custom & owner/builder | Collateral Pledged
Financing Receivable, Allowance for Credit Loss [Line Items]
Recorded Investment	152
Related ACL	0
Home equity
Financing Receivable, Allowance for Credit Loss [Line Items]
Recorded Investment	381	382
Related ACL	0	0
Home equity | Collateral Pledged
Financing Receivable, Allowance for Credit Loss [Line Items]
Recorded Investment	165
Related ACL	0
Commercial business
Financing Receivable, Allowance for Credit Loss [Line Items]
Recorded Investment	293	286
Related ACL	123	$ 123
Commercial business | Collateral Pledged
Financing Receivable, Allowance for Credit Loss [Line Items]
Recorded Investment	1,759
Related ACL	$ 333

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

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

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- Definition

Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 14A
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-14A

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- Definition

Amount of allowance for credit losses related to recorded investment.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (a)(3)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-15

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