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Fair Value Measurements Fair Value, Assets Measured on Recurring Basis, Valuation Techniques (Details)
$ in Thousands
12 Months Ended
Mar. 31, 2019
USD ($)
Mar. 31, 2018
USD ($)
Mar. 31, 2017
USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Mortgage servicing rights $ 180 $ 181  
Fair Value, Inputs, Level 3      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Mortgage servicing rights 180 181  
Fair Value, Measurements, Recurring [Member]      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Mortgage servicing rights 180 181  
Fair Value, Measurements, Recurring [Member] | Other 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 454 $ 433 $ 403
Fair Value Measurements, Valuation Processes, Description   Cost Cost
Fair Value, Measurements, Recurring [Member] | 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 $ 180 $ 181 $ 192
Fair Value Measurements, Valuation Processes, Description   Discounted Cash Flow Discounted Cash Flow
Servicing Asset, Measurement Input [Extensible List] [1] Weighted Average Constant Prepayment Rate (1) Weighted Average Constant Prepayment Rate (1)  
Fair Value Inputs, Prepayment Rate (Deprecated 2018-01-31) [1] 0.1119 0.2003  
[1] (1) Represents annualized loan repayment rate assumptions