Investments (Details 2) - USD ($) $ in Thousands	Jun. 30, 2018	Mar. 31, 2018
Investment Securities in a Continuous Unrealized Loss Position
Less than 12 Months, Fair Value	$ 6,784	$ 7,086
Less than 12 month, Unrealized Losses	(123)	(111)
12 Months or Longer, Fair Value	6,553	6,456
12 Months or Longer, Unrealized Losses	(213)	(230)
Debt Securities, Available-for-sale, Unrealized Loss Position	13,337	13,542
Gross Unrealized Losses	(336)	(341)
U.S. Treasury and Government Agencies [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	0	0
Investment Securities in a Continuous Unrealized Loss Position
Less than 12 Months, Fair Value	292	293
Less than 12 month, Unrealized Losses	(8)	(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	292	293
Gross Unrealized Losses	(8)	(7)
Mortgage-backed securities [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	0	0
Investment Securities in a Continuous Unrealized Loss Position
Less than 12 Months, Fair Value	3,128	3,185
Less than 12 month, Unrealized Losses	(64)	(52)
12 Months or Longer, Fair Value	4,019	3,909
12 Months or Longer, Unrealized Losses	(118)	(103)
Debt Securities, Available-for-sale, Unrealized Loss Position	7,147	7,094
Gross Unrealized Losses	(182)	(155)
States and political subdivisions [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	109	109
Investment Securities in a Continuous Unrealized Loss Position
Less than 12 Months, Fair Value	1,932	2,224
Less than 12 month, Unrealized Losses	(38)	(40)
12 Months or Longer, Fair Value	2,169	2,180
12 Months or Longer, Unrealized Losses	(80)	(109)
Debt Securities, Available-for-sale, Unrealized Loss Position	4,101	4,404
Gross Unrealized Losses	(118)	(149)
Corporate Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	2	1
Investment Securities in a Continuous Unrealized Loss Position
Less than 12 Months, Fair Value	1,432	1,384
Less than 12 month, Unrealized Losses	(13)	(12)
12 Months or Longer, Fair Value	365	367
12 Months or Longer, Unrealized Losses	(15)	(18)
Debt Securities, Available-for-sale, Unrealized Loss Position	1,797	1,751
Gross Unrealized Losses	$ (28)	$ (30)