Note 3: Securities: Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jun. 30, 2019
US Government-sponsored Enterprises Debt Securities
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 0	$ 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	3,489	6,969
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	8	15
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	3,489	6,969
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	8	15
US States and Political Subdivisions Debt Securities
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	2,877	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	14	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	2,585	8,531
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	19	68
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	5,462	8,531
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	33	68
Other Debt Obligations
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	966	985
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	214	198
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	966	985
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	214	198
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	29,390	1,175
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	185	1
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	11,783	34,148
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	146	316
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	41,173	35,323
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	331	317
Total investments and mortgage-backed securities
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	32,267	1,175
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	199	1
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	18,823	50,633
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	387	597
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	51,090	51,808
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 586	$ 598