Note 2: Investments in Debt and Equity Securities: Schedule of Unrealized Loss on Investments (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
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 aggregate losses		(2,745)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	20,000
Available for sale securities continuous unrealized loss position 12 months or longer aggregate losses	(486)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	20,000	20,000
Available for sale securities continuous unrealized loss position aggregate losses	(486)	(2,745)
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	40,042	127,901
Available for sale securities continuous unrealized loss position less than 12 months aggregate losses	(328)	(1,871)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	45,056	39,255
Available for sale securities continuous unrealized loss position 12 months or longer aggregate losses	(493)	(395)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	85,098	167,156
Available for sale securities continuous unrealized loss position aggregate losses	(821)	(2,266)
US States and Political Subdivisions Debt Securities
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		50,401
Available for sale securities continuous unrealized loss position less than 12 months aggregate losses		(1,938)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	925
Available for sale securities continuous unrealized loss position 12 months or longer aggregate losses	(7)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	925	50,401
Available for sale securities continuous unrealized loss position aggregate losses	(7)	(1,938)
Unrealized Losses and Fair Value of Investments
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	40,042	198,302
Available for sale securities continuous unrealized loss position less than 12 months aggregate losses	(328)	(6,554)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	65,981	39,255
Available for sale securities continuous unrealized loss position 12 months or longer aggregate losses	(986)	(395)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	106,023	237,557
Available for sale securities continuous unrealized loss position aggregate losses	$ (1,314)	$ (6,949)