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Note 4. Investment Securities (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Details    
Available-for-sale Securities, Gross Realized Gains (Losses), Sale Proceeds $ 31,494 $ 106,415
Available-for-sale Securities, Gross Realized Gains 615 3,114
Available-for-sale Securities, Gross Realized Losses 17 182
Net impairment losses recognized in earnings $ 0 $ 0