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Investment Securities Schedule of Realized Gains (Losses) from Sale of AFS Securities (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Investments, Debt and Equity Securities [Abstract]        
Proceeds $ 7,259 $ 4,951 $ 7,259 $ 4,951
Gross Gains 58 2 58 2
Gross Losses $ 0 $ 1 $ 0 $ 1