Investment Securities Text Tag (Details)	12 Months Ended
	Mar. 31, 2023 USD ($)	Mar. 31, 2022 USD ($)
Investments, Debt and Equity Securities [Abstract]
Available-for-sale	$ 53,843,000	$ 67,596,000
Percentage Available-for-sale Securities	95.90%
Debt Securities, Held-to-maturity	$ 2,318,000	5,254,000
Percentage Held-to-maturity Securities	4.10%
Debt Securities, Trading, and Equity Securities, FV-NI	$ 0	0
Bank Owned Life Insurance	5,100,000
Other Investments	6,100,000
Proceeds from sales of investments: Available-for-sale	$ 0	$ 0
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	24	23
Debt Securities, Available-for-sale [Line Items]
Available-for-sale	$ 53,843,000	$ 67,596,000
Asset Pledged as Collateral | Federal Home Loan Bank Advances
Investments, Debt and Equity Securities [Abstract]
Available-for-sale	2,500,000
Debt Securities, Available-for-sale [Line Items]
Available-for-sale	2,500,000
Mortgage-Backed Securities
Investments, Debt and Equity Securities [Abstract]
Available-for-sale	27,443,000	33,579,000
Debt Securities, Held-to-maturity	$ 2,318,000
Debt Securities, Available-for-sale [Line Items]
Percentage Available-for-Sale, Continuous Unrealized Loss Position	50.70%
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	8
Available-for-sale	$ 27,443,000	33,579,000
US Government Agency Securities
Investments, Debt and Equity Securities [Abstract]
Available-for-sale	$ 9,326,000	13,785,000
Debt Securities, Available-for-sale [Line Items]
Percentage Available-for-Sale, Continuous Unrealized Loss Position	17.40%
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	2
Available-for-sale	$ 9,326,000	13,785,000
Corporate Bonds
Investments, Debt and Equity Securities [Abstract]
Available-for-sale	$ 3,092,000	4,121,000
Debt Securities, Available-for-sale [Line Items]
Percentage Available-for-Sale, Continuous Unrealized Loss Position	5.80%
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	1
Available-for-sale	$ 3,092,000	4,121,000
Municipal Bonds
Investments, Debt and Equity Securities [Abstract]
Available-for-sale	$ 13,982,000	15,768,000
Debt Securities, Available-for-sale [Line Items]
Percentage Available-for-Sale, Continuous Unrealized Loss Position	26.10%
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	6
Available-for-sale	$ 13,982,000	$ 15,768,000