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Nonaccrual loans (Details) - Non-performing - USD ($) $ in Thousands	Mar. 31, 2024	Mar. 31, 2023
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, Nonaccrual, No Allowance	$ 144
Financing Receivable, Nonaccrual, With Allowance	11,631
Financing Receivable, Excluding Accrued Interest, Nonaccrual	11,775	$ 12,261
One-to-four family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, Nonaccrual, No Allowance	0
Financing Receivable, Nonaccrual, With Allowance	3,554
Financing Receivable, Excluding Accrued Interest, Nonaccrual	3,554	4,001
Multifamily
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, Nonaccrual, No Allowance	0
Financing Receivable, Nonaccrual, With Allowance	2,238
Financing Receivable, Excluding Accrued Interest, Nonaccrual	2,238	71
Commercial Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, Nonaccrual, No Allowance	0
Financing Receivable, Nonaccrual, With Allowance	4,522
Financing Receivable, Excluding Accrued Interest, Nonaccrual	4,522	7,190
Business
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, Nonaccrual, No Allowance	100
Financing Receivable, Nonaccrual, With Allowance	1,317
Financing Receivable, Excluding Accrued Interest, Nonaccrual	1,417	998
Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, Nonaccrual, No Allowance	44
Financing Receivable, Nonaccrual, With Allowance	0
Financing Receivable, Excluding Accrued Interest, Nonaccrual	$ 44	$ 1

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- Definition

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+ References

No definition available.

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- Definition

Amortized cost excluding accrued interest, of financing receivable on nonaccrual status. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 16
-Subparagraph (a)
-Publisher FASB
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- Definition

Amortized cost excluding accrued interest, of financing receivable on nonaccrual status with no allowance for credit loss. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
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-Section 50
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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 14
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-URI https://asc.fasb.org/1943274/2147479319/326-20-50-14

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-Publisher FASB
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