Note 6: Investment Securities: Unrealized Gain (Loss) on Investments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
Mar. 31, 2015	Dec. 31, 2014
Total Unrealized Losses And Estimated Fair Value
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 2,869	$ 40,042
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss	(13)	(328)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	70,014	65,981
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss	(829)	(986)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	72,883	106,023
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss	(842)	(1,314)
US Government Agencies Debt Securities
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	20,000	20,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss	(414)	(486)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	20,000	20,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss	(414)	(486)
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	2,869	40,042
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss	(13)	(328)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	49,093	45,056
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss	(409)	(493)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	51,962	85,098
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss	(422)	(821)
US States and Political Subdivisions Debt Securities
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	921	925
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss	(6)	(7)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	921	925
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss	$ (6)	$ (7)

Amount of unrealized loss on securities classified as available-for-sale that have been in a loss position for twelve months or longer.

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