Note 5: Investment Securities: Unrealized Gain (Loss) on Investments (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Unrealized Losses and Estimated Fair Value
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		$ 65,494
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		(567)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		10,545
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		(254)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		76,039
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss		(821)
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 35,197	45,494
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(62)	(348)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	3,781	9,635
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(38)	(253)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	38,978	55,129
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ (100)	(601)
US Government Agencies Debt Securities
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		20,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		(219)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		20,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss		(219)
US States and Political Subdivisions Debt Securities
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		910
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		(1)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		910
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss		$ (1)