Fair Value Measurements Fair Value Measurements-Assets Measured on a Non-recurring basis, Valuation Techniques (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other Real Estate, Foreclosed Assets, and Repossessed Assets	$ 404
Fair Value, Measurements, Nonrecurring [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	2,027	$ 4,476
Other Real Estate, Foreclosed Assets, and Repossessed Assets	404	1,145
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	$ 2,027	$ 4,476
Fair Value Measurements, Valuation Processes, Description	Appraisal of collateral	Appraisal of collateral
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings, Description	Appraisal adjustments	Appraisal adjustments
Other Real Estate, Foreclosed Assets, and Repossessed Assets		$ 1,145