Fair Value Measurements Fair Value, Assets Measured on Nonrecurring Basis, Valuation Techniques (Details) - Fair Value, Measurements, Nonrecurring - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Sep. 30, 2018	Mar. 31, 2018
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	$ 3,324	$ 4,476
Other Real Estate Owned	262	1,145
Fair Value, Inputs, Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	3,324	4,476
Other Real Estate Owned	$ 262	$ 1,145
Fair Value Measurements, Valuation Processes, Description	Appraisal of collateral	Appraisal of collateral
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings, Description	Costs to sell	Costs to sell