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Note 7: Investments in Limited Partnerships: Investments in Affordable Housing Partnerships Policy (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Number of Investments in Affordable Housing Partnerships | 11 | 11 |
Investments in Affordable Housing Partnerships Net Carrying Value | $ 33,900 | $ 28,700 |
Federal Affordable Housing Tax Credits | 44,200 |  |
Expected Amortization of Investments in Affordable Housing Partnerships | 33,400 |  |
Usage of Federal Affordable Housing Tax Credits | 5,200 | 2,600 | 1,300
Actual Amortization of Investments in Affordable Housing Partnerships | $ 4,600 | $ 1,900 | $ 1,200

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