Investment Securities Text Tags (Details)	9 Months Ended
	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Mar. 31, 2021 USD ($)
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	14		15
Proceeds from Sale of Debt Securities, Available-for-sale	$ 0	$ 30,190,000
Debt Securities, Available-for-sale	$ 75,268,000		$ 86,507,000
Percentage Available-for-sale Securities	93.30%
Debt Securities, Held-to-maturity	$ 5,407,000		7,807,000
Percentage Held-to-maturity Securities	6.70%
Trading	$ 0
Mortgage-backed securities
Schedule of Investments [Line Items]
Percentage Available-for-Sale, Continuos Unrealized Loss Position	50.10%
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	4
Debt Securities, Available-for-sale	$ 37,317,000		43,421,000
US Government Agency Securities
Schedule of Investments [Line Items]
Percentage Available-for-Sale, Continuos Unrealized Loss Position	21.60%
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	3
Debt Securities, Available-for-sale	$ 15,071,000		18,631,000
Municipal Securities
Schedule of Investments [Line Items]
Percentage Available-for-Sale, Continuos Unrealized Loss Position	20.80%
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	1
Debt Securities, Available-for-sale	$ 17,287,000		16,610,000
Corporate Bonds
Schedule of Investments [Line Items]
Percentage Available-for-Sale, Continuos Unrealized Loss Position	7.40%
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	1
Debt Securities, Available-for-sale	$ 5,182,000		$ 4,481,000