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Fair Value Measurements Fair Value on a Non-recurring basis (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Mar. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other Real Estate, Foreclosed Assets, and Repossessed Assets $ 404  
Fair Value, Measurements, Nonrecurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired Financing Receivable, with Related Allowance, Recorded Investment 2,027 $ 4,476
Other Real Estate, Foreclosed Assets, and Repossessed Assets 404 1,145
Fair Value, Measurements, Nonrecurring [Member] | 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 [Member] | 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 [Member] | 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 $ 2,027 4,476
Other Real Estate, Foreclosed Assets, and Repossessed Assets   $ 1,145