Fair Value Measurements Fair Value Measurements, Nonrecurring (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Mar. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Real Estate, Foreclosed Assets, and Repossessed Assets	$ 604	$ 787
Fair Value, Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	3,417	5,953
Other Real Estate, Foreclosed Assets, and Repossessed Assets	604	990
Fair Value, Measurements, Nonrecurring | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0	0
Other Real Estate, Foreclosed Assets, and Repossessed Assets	0	0
Fair Value, Measurements, Nonrecurring | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0	0
Other Real Estate, Foreclosed Assets, and Repossessed Assets	0	0
Fair Value, Measurements, Nonrecurring | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	3,417	5,953
Other Real Estate, Foreclosed Assets, and Repossessed Assets	$ 604	$ 990