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Note 6: Investment Securities: Schedule of Gross Unrealized Losses and Estimated Fair Value of Investments (Details) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Collateralized Mortgage Obligations
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 2
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	(2)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	409	414
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	(2)	(8)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	411	414
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	(4)	(8)
U.S. Government Agency Residential Mortgage-Backed Securities
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	141,062	106,136
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	(452)	(814)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	141,062	106,136
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	(452)	(814)
Total Unrealized Losses and Estimated Fair Value
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	141,064	106,136
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	(454)	(814)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	409	414
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	(2)	(8)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	141,473	106,550
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	$ (456)	$ (822)

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