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Regulatory Capital Requirements - Schedule of Actual Capital Amounts and Ratios (Details) $ in Thousands | Sep. 30, 2025 USD ($) | Mar. 31, 2025 USD ($)
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Total Capital (to Risk- Weighted Assets), Actual Amount | $ 75,554 | $ 72,977
Tier 1 Capital (to Risk- Weighted Assets), Actual Amount | 70,216 | 67,856
Common Equity Tier 1 Capital to Risk-Weighted Assets, Actual Amount | 70,216 | 67,856
Tier 1 Capital (to Average Assets), Actual Amount | $ 70,216 | $ 67,856
Total Capital (to Risk- Weighted Assets), Actual Ratio | 0.1771 | 0.1783
Tier 1 Capital (to Risk- Weighted Assets), Actual Ratio | 0.1646 | 0.1658
Common Equity Tier 1 Capital to Risk-Weighted Assets, Actual Ratio | 0.1646 | 0.1658
Tier 1 Capital (to Average Assets), Actual Ratio | 0.1405 | 0.1378
Total Capital (to Risk- Weighted Assets), Minimum Required for Capital Adequacy Purposes, Amount | $ 34,133 | $ 32,734
Tier 1 Capital (to Risk- Weighted Assets), Minimum Required for Capital Adequacy Purposes, Amount | 25,600 | 24,551
Common Equity Tier 1 Capital to Risk-Weighted Assets, Minimum Required for Capital Adequacy Purposes, Amount | 19,200 | 18,413
Tier 1 Capital (to Average Assets), Minimum Required for Capital Adequacy Purposes, Amount | $ 19,996 | $ 19,701
Total Capital (to Risk- Weighted Assets), Minimum Required for Capital Adequacy Purposes, Ratio | 0.08 | 0.08
Tier 1 Capital (to Risk- Weighted Assets), Minimum Required for Capital Adequacy Purposes, Ratio | 0.06 | 0.06
Common Equity Tier 1 Capital to Risk-Weighted Assets, Minimum Required for Capital Adequacy Purposes, Ratio | 0.045 | 0.045
Tier 1 Capital (to Average Assets), Minimum Required for Capital Adequacy Purposes, Ratio | 0.04 | 0.04
Total Capital (to Risk- Weighted Assets), Minimum Required To be Well-Capitalized Under Prompt Corrective Action Provisions, Amount | $ 42,666 | $ 40,918
Tier 1 Capital (to Risk- Weighted Assets), Minimum Required To be Well-Capitalized Under Prompt Corrective Action Provisions, Amount | 34,133 | 32,734
Common Equity Tier 1 Capital to Risk-Weighted Assets, Minimum Required To be Well-Capitalized Under Prompt Corrective Action Provisions, Amount | 27,733 | 26,597
Tier 1 Capital (to Average Assets), Minimum Required To be Well-Capitalized Under Prompt Corrective Action Provisions, Amount | $ 24,995 | $ 24,626
Total Capital (to Risk- Weighted Assets), Minimum Required To be Well-Capitalized Under Prompt Corrective Action Provisions, Ratio | 0.10 | 0.10
Tier 1 Capital (to Risk- Weighted Assets), Minimum Required To be Well-Capitalized Under Prompt Corrective Action Provisions, Ratio | 0.08 | 0.08
Common Equity Tier 1 Capital to Risk-Weighted Assets, Minimum Required To be Well-Capitalized Under Prompt Corrective Action Provisions, Ratio | 0.065 | 0.065
Tier 1 Capital (to Average Assets), Minimum Required To be Well-Capitalized Under Prompt Corrective Action Provisions, Ratio | 0.05 | 0.05

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- Definition Amount of total capital as defined by regulatory framework. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477270/942-505-50-1 + Details
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