Investment Securities Text Tag (Details)	12 Months Ended
Mar. 31, 2025 USD ($)	Mar. 31, 2024 USD ($)
Investments, Debt and Equity Securities [Abstract]
Available-for-sale	$ 44,522,000	$ 48,030,000
Percentage Available-for-sale Securities	96.20%
Debt Securities, Held-to-maturity	$ 1,750,000	2,008,000
Percentage Held-to-maturity Securities	3.80%
Debt Securities, Trading, and Equity Securities, FV-NI	$ 0	0
Bank Owned Life Insurance	5,000,000.0
Other Investments	6,400,000
Proceeds from sales of investments: Available-for-sale	$ 0	$ 0
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	22	24
Debt Securities, Available-for-sale [Line Items]
Available-for-sale	$ 44,522,000	$ 48,030,000
Debt Securities, Available-for-Sale, Allowance for Credit Loss	0
Debt Securities, Held-to-Maturity, Allowance for Credit Loss	0
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Deposit Liabilities, Collateral Issued, Financial Instruments	$ 300,000
Held-to-Maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	5
Mortgage-Backed Securities
Investments, Debt and Equity Securities [Abstract]
Available-for-sale	$ 23,072,000	24,717,000
Debt Securities, Held-to-maturity	$ 1,750,000
Debt Securities, Available-for-sale [Line Items]
Percentage Available-for-Sale, Continuous Unrealized Loss Position	51.60%
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	7
Available-for-sale	$ 23,072,000	24,717,000
US Government Agency Securities
Investments, Debt and Equity Securities [Abstract]
Available-for-sale	$ 4,310,000	6,194,000
Debt Securities, Available-for-sale [Line Items]
Percentage Available-for-Sale, Continuous Unrealized Loss Position	9.70%
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	3
Available-for-sale	$ 4,310,000	6,194,000
Corporate Bonds
Investments, Debt and Equity Securities [Abstract]
Available-for-sale	$ 2,820,000	3,063,000
Debt Securities, Available-for-sale [Line Items]
Percentage Available-for-Sale, Continuous Unrealized Loss Position	6.40%
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	1
Available-for-sale	$ 2,820,000	3,063,000
Municipal Bonds
Investments, Debt and Equity Securities [Abstract]
Available-for-sale	$ 14,320,000	14,056,000
Debt Securities, Available-for-sale [Line Items]
Percentage Available-for-Sale, Continuous Unrealized Loss Position	32.30%
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	6
Available-for-sale	$ 14,320,000	$ 14,056,000
Debt Securities
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged	$ 1,900,000

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