Note 3: Securities: Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Jun. 30, 2018
US Government-sponsored Enterprises Debt Securities
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 3,843	$ 5,957
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	17	58
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	7,381	3,427
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	97	70
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	11,224	9,384
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	114	128
US States and Political Subdivisions Debt Securities
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	4,516	14,861
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	27	224
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	19,194	8,526
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	370	256
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	23,710	23,387
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	397	480
Other Debt Obligations
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	0	982
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	10
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	1,033	1,109
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	157	183
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	1,033	2,091
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	157	193
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	23,207	65,863
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	321	1,513
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	58,839	24,187
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	1,920	1,020
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	82,046	90,050
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	2,241	2,533
Total investments and mortgage-backed securities
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	31,566	87,663
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	365	1,805
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	86,447	37,249
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	2,544	1,529
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	118,013	124,912
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 2,909	$ 3,334