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Fair Value Measurements Fair Value Measurements-Assets Measured on a Non-recurring basis, Valuation Techniques (Details) - Fair Value, Measurements, Nonrecurring [Member] - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Impaired Financing Receivable, with Related Allowance, Recorded Investment $ 4,476 $ 5,953
Other Real Estate, Foreclosed Assets, and Repossessed Assets 1,145 990
Fair Value, Inputs, Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Impaired Financing Receivable, with Related Allowance, Recorded Investment $ 4,476 $ 5,953
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 $ 990