Investments (Details 2) - USD ($) $ in Thousands	Sep. 29, 2018	Mar. 31, 2018
Investment Securities in a Continuous Unrealized Loss Position
Less than 12 Months, Fair Value	$ 4,640	$ 7,086
Less than 12 month, Unrealized Losses	(85)	(111)
12 Months or Longer, Fair Value	8,097	6,456
12 Months or Longer, Unrealized Losses	(265)	(230)
Debt Securities, Available-for-sale, Unrealized Loss Position	12,737	13,542
Gross Unrealized Losses	(350)	(341)
U.S. Treasury and Government Agencies [Member]
Investment Securities in a Continuous Unrealized Loss Position
Less than 12 Months, Fair Value	290	293
Less than 12 month, Unrealized Losses	(10)	(7)
12 Months or Longer, Fair Value	0	0
12 Months or Longer, Unrealized Losses	0	0
Debt Securities, Available-for-sale, Unrealized Loss Position	290	293
Gross Unrealized Losses	(10)	(7)
Mortgage-backed securities [Member]
Investment Securities in a Continuous Unrealized Loss Position
Less than 12 Months, Fair Value	2,738	3,185
Less than 12 month, Unrealized Losses	(51)	(52)
12 Months or Longer, Fair Value	4,764	3,909
12 Months or Longer, Unrealized Losses	(156)	(103)
Debt Securities, Available-for-sale, Unrealized Loss Position	7,502	7,094
Gross Unrealized Losses	(207)	(155)
States and political subdivisions [Member]
Investment Securities in a Continuous Unrealized Loss Position
Less than 12 Months, Fair Value	1,097	2,224
Less than 12 month, Unrealized Losses	(18)	(40)
12 Months or Longer, Fair Value	2,478	2,180
12 Months or Longer, Unrealized Losses	(90)	(109)
Debt Securities, Available-for-sale, Unrealized Loss Position	3,575	4,404
Gross Unrealized Losses	(108)	(149)
Corporate Debt Securities [Member]
Investment Securities in a Continuous Unrealized Loss Position
Less than 12 Months, Fair Value	515	1,384
Less than 12 month, Unrealized Losses	(6)	(12)
12 Months or Longer, Fair Value	855	367
12 Months or Longer, Unrealized Losses	(19)	(18)
Debt Securities, Available-for-sale, Unrealized Loss Position	1,370	1,751
Gross Unrealized Losses	$ (25)	$ (30)