Note 3: Securities: Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Jun. 30, 2018
US Government-sponsored Enterprises Debt Securities
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 4,710	$ 5,957
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	61	58
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	3,426	3,427
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	72	70
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	8,136	9,384
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	133	128
US States and Political Subdivisions Debt Securities
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	18,087	14,861
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	307	224
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	9,317	8,526
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	319	256
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	27,404	23,387
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	626	480
Other Debt Obligations
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	996	982
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	4	10
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	1,067	1,109
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	127	183
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	2,063	2,091
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	131	193
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	67,495	65,863
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	1,672	1,513
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	22,906	24,187
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	1,041	1,020
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	90,401	90,050
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	2,713	2,533
Total investments and mortgage-backed securities
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	91,288	87,663
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	2,044	1,805
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	36,716	37,249
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	1,559	1,529
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	128,004	124,912
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 3,603	$ 3,334