Employee Benefit Plans (Summary of Financing Arrangements for Leveraged ESOP Debt) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Issued June, 1991 [Member]
Debt Disclosure [Abstract]
Employee stock ownership plan (ESOP), debt structure, indirect loan, amount
Employee stock ownership plan (ESOP), interest payments	1	$ 1	$ 2
Issued July, 2009 [Member]
Debt Disclosure [Abstract]
Employee stock ownership plan (ESOP), debt structure, indirect loan, amount	233
Employee stock ownership plan (ESOP), interest payments	17	26	36
Issued February, 2016 [Member]
Debt Disclosure [Abstract]
Employee stock ownership plan (ESOP), debt structure, indirect loan, amount	4,966
Employee stock ownership plan (ESOP), interest payments	$ 190	$ 242