Note 2: Investments in Debt and Equity Securities: Schedule of Unrealized Loss on Investments (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Collateralized Mortgage Backed Securities
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		$ 3,760
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses		(110)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	414	1,460
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	(8)	(270)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	414	5,220
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	(8)	(380)
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	106,136	61,720
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	(814)	(365)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		91,824
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses		(437)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	106,136	153,544
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	(814)	(802)
Total securities in unrealized loss position
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	106,136	71,916
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	(814)	(519)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	414	100,665
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	(8)	(1,566)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	106,550	172,581
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	(822)	(2,085)
US States and Political Subdivisions Debt Securities
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		6,436
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses		(44)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		7,381
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses		(859)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		13,817
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses		$ (903)