Securities - Summary of investments' gross unrealized losses and fair value (Details 2) - USD ($) $ in Thousands	Dec. 31, 2018	Jun. 30, 2018
Available-for-sale Securities:
Less than 12 Months, Fair Value	$ 250	$ 2,429
Less than 12 Months, Unrealized Losses	(2)	(39)
12 Months or Longer, Fair Value	3,496	2,441
12 Months or Longer, Unrealized Losses	(82)	(89)
Total, Fair Value	3,746	4,870
Total, Unrealized Losses	(84)	(128)
Mortgage-backed securities of U.S. government sponsored entities - residential
Available-for-sale Securities:
Less than 12 Months, Fair Value	250	1,777
Less than 12 Months, Unrealized Losses	(2)	(31)
12 Months or Longer, Fair Value	2,473	1,568
12 Months or Longer, Unrealized Losses	(58)	(63)
Total, Fair Value	2,723	3,345
Total, Unrealized Losses	(60)	(94)
Collateralized mortgage obligations of government sponsored entities - residential
Available-for-sale Securities:
Less than 12 Months, Fair Value	0	121
Less than 12 Months, Unrealized Losses	0	(5)
12 Months or Longer, Fair Value	111	0
12 Months or Longer, Unrealized Losses	(4)	0
Total, Fair Value	111	121
Total, Unrealized Losses	(4)	(5)
State and political subdivisions Taxable
Available-for-sale Securities:
Less than 12 Months, Fair Value	0	0
Less than 12 Months, Unrealized Losses	0	0
12 Months or Longer, Fair Value	544	510
12 Months or Longer, Unrealized Losses	(1)	(3)
Total, Fair Value	544	510
Total, Unrealized Losses	(1)	(3)
State and political subdivisions Nontaxable
Available-for-sale Securities:
Less than 12 Months, Fair Value	0	531
Less than 12 Months, Unrealized Losses	0	(3)
12 Months or Longer, Fair Value	368	363
12 Months or Longer, Unrealized Losses	(19)	(23)
Total, Fair Value	368	894
Total, Unrealized Losses	$ (19)	$ (26)

Community Savings Bancorp, Inc. 10-Q