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Fair Value Measurements Fair Value, Assets Measured on Recurring Basis, Valuation Techniques (Details)
$ in Thousands
12 Months Ended
Mar. 31, 2018
USD ($)
Mar. 31, 2017
USD ($)
Mar. 31, 2016
USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Mortgage servicing rights $ 181 $ 192  
Fair Value, Inputs, Level 3      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Mortgage servicing rights 181 192  
Fair Value, Measurements, Recurring [Member]      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Mortgage servicing rights 181 192  
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 $ 433 $ 403 $ 193
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 $ 181 $ 192 $ 201
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] 0.2003 0.2237  
[1] (1) Represents annualized loan repayment rate assumptions