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Note 6: Investment Securities: Schedule of Gross Unrealized Losses and Estimated Fair Value of Investments (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
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Total Unrealized Losses and Estimated Fair Value |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | $ 215,816 | $ 106,136
AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses3 | (3,241) | (814)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 1 | 414
AvailableforsaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses3 |  | (8)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 215,817 | 106,550
AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses3 | (3,241) | (822)
Collateralized Mortgage Obligations |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 414
AvailableforsaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses3 |  | (8)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  | 414
AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses3 |  | (8)
U.S. Government Agency Residential Mortgage-Backed Securities |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | 106,136
AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses3 |  | (814)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  | 106,136
AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses3 |  | (814)
US Government Agencies Debt Securities |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 20,000 |
AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses3 | (856) |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 20,000 |
AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses3 | (856) |
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 163,381 |
AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses3 | (1,647) |
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 1 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 163,382 |
AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses3 | (1,647) |
US States and Political Subdivisions Debt Securities |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 32,435 |
AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses3 | (738) |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 32,435 |
AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses3 | $ (738) |

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