Loans and Allowance for Credit Losses - Summary of Recorded Investment in Nonaccrual and Loans Past Due (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Mar. 31, 2023
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	$ 557	$ 850
Loans Past Due 90 Days or More Still Accuring	176	178
Residential Portfolio Segment \| 1-4 Family Residential
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual		338
Commercial Real Estate Portfolio Segment \| Commercial Real Estate
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	431	483
Commercial Non Real Estate Portfolio Segment \| Commercial - Non Real Estate
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	19	29
Consumer Portfolio Segment \| Other Consumer
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	6
Loans Past Due 90 Days or More Still Accuring	$ 176	$ 178

Amortized cost of financing receivable on nonaccrual status. Excludes net investment in lease.

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
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-16

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph (a)
-Subparagraph (3)
-Publisher SEC

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph (a)
-Subparagraph (2)
-Publisher SEC

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-7

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