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Fair Value Measurements Fair Value Measurements, Nonrecurring (Details) - Fair Value, Measurements, Nonrecurring - USD ($)
$ in Thousands
Sep. 30, 2018
Mar. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired Financing Receivable, with Related Allowance, Recorded Investment $ 3,324 $ 4,476
Other Real Estate Owned 262 1,145
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 Owned 0 0
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 Owned 0 0
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 3,324 4,476
Other Real Estate Owned $ 262 $ 1,145