Employee Benefit Plans (Summary of Financing Arrangements for Leveraged ESOP Debt) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Issued June, 1991 [Member]
Debt Disclosure [Abstract]
Employee stock ownership plan (ESOP), debt structure, indirect loan, amount	$ 16
Employee stock ownership plan (ESOP), interest payments	1	$ 2	$ 10
Issued July, 2009 [Member]
Debt Disclosure [Abstract]
Employee stock ownership plan (ESOP), debt structure, indirect loan, amount	466
Employee stock ownership plan (ESOP), interest payments	26	36	33
Issued February, 2016 [Member]
Debt Disclosure [Abstract]
Employee stock ownership plan (ESOP), debt structure, indirect loan, amount	5,122
Employee stock ownership plan (ESOP), interest payments	$ 242