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Other Comprehensive Income (Loss) Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]      
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax $ (307) $ (1,045) $ (4,768)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net $ 700 $ 3,700