Note 2: Investments in Debt and Equity Securities: Schedule of Unrealized Loss on Investments (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
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, Fair Value	20,000
Available for sale securities continuous unrealized loss position aggregate losses	(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	127,901	106,136
Available for sale securities continuous unrealized loss position less than 12 months aggregate losses	(1,871)	(814)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	39,255
Available for sale securities continuous unrealized loss position 12 months or longer aggregate losses	(395)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	167,156	106,136
Available for sale securities continuous unrealized loss position aggregate losses	(2,266)	(814)
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, Fair Value	50,401
Available for sale securities continuous unrealized loss position aggregate losses	(1,938)
Unrealized Losses and Fair Value of Investments
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	198,302	106,136
Available for sale securities continuous unrealized loss position less than 12 months aggregate losses	(6,554)	(814)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	39,255	414
Available for sale securities continuous unrealized loss position 12 months or longer aggregate losses	(395)	(8)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	237,557	106,550
Available for sale securities continuous unrealized loss position aggregate losses	(6,949)	(822)
Collateralized Mortgage Obligations
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		414
Available for sale securities continuous unrealized loss position 12 months or longer aggregate losses		(8)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		414
Available for sale securities continuous unrealized loss position aggregate losses		$ (8)