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Note 4: Acquired Loans, Loss Sharing Agreements and FDIC Indemnification Assets: Schedule of Business Combination Accretable Yield (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Details |  |  |
Increase in accretable yield due to increased cash flow expectations | $ 1,333 | $ 10,598 | $ 13,720
Decrease in FDIC indemnification asset as a result of accretable yield increase | $ 0 | $ (2,744) | $ (5,056)

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