Fair Value Measurements Fair Value, Assets Measured on Recurring Basis, Valuation Techniques (Details) $ in Thousands		12 Months Ended
		Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)
Fair Value, Inputs, Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage servicing rights		$ 145	$ 180
Fair Value, Measurements, Recurring
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage servicing rights		$ 145	$ 180
Fair Value, Measurements, Recurring | Other Assets | Fair Value, Inputs, Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value Measurements, Valuation Processes, Description		Discounted Cash Flow	Discounted Cash Flow
Servicing Asset, Measurement Input	[1]	0.1564	0.1119
Fair Value, Measurements, Recurring | Other Assets | Fair Value, Inputs, Level 3 | Measurement Input, Constant Prepayment Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value Measurements, Valuation Processes, Description	[1]	Weighted Average Constant Prepayment Rate (1)	Weighted Average Constant Prepayment Rate (1)
Fair Value, Measurements, Recurring | Other Assets | Fair Value, Inputs, Level 3 | Measurement Input, Discount Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value Measurements, Valuation Processes, Description		Option Adjusted Spread ("OAS") applied to Treasury curve	Option Adjusted Spread ("OAS") applied to Treasury curve

[1] ⁽¹⁾ Represents annualized loan repayment rate assumptions