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Fair Value Measurements Fair Value, Assets Measured on Recurring Basis, Valuation Techniques (Details) $ in Thousands		6 Months Ended	12 Months Ended
		Sep. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Sep. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)
Fair Value, Inputs, Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage servicing rights		$ 174	$ 180
Other investments		492	454
Fair Value, Measurements, Recurring
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage servicing rights		174	180
Other investments		492	454
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage servicing rights			180
Fair Value, Measurements, Recurring | Equity Investments | Fair Value, Inputs, Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value		$ 492	$ 454	$ 435	$ 433
Fair Value Measurements, Valuation Processes, Description		Cost	Cost
Fair Value, Measurements, Recurring | Other Assets | Fair Value, Inputs, Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value		$ 174	$ 180	$ 161	$ 181
Fair Value Measurements, Valuation Processes, Description		Discounted Cash Flow	Discounted Cash Flow
Servicing Asset, Measurement Input		0.2163	0.1119
Measurement Input, Constant Prepayment Rate | 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	[1]	Weighted Average Constant Prepayment Rate(1)	Weighted Average Constant Prepayment Rate(1)
Measurement Input, Discount Rate | 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	[1]	Option Adjusted Spread ("OAS") applied to Treasury curve	Option Adjusted Spread ("OAS" applied to Treasury curve
[1] (1) Represents annualized loan repayment rate assumptions

X

- Definition

Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 45
-Paragraph 1A
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+ References

No definition available.

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Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Description of the valuation processes in place for fair value measurements categorized within Level 3 of the fair value hierarchy.

+ References

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-Publisher FASB
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Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

+ References

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-SubTopic 50
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Value of input used to measure servicing asset.

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