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8. Income Taxes (Details 1) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Income Taxes Details 1 |  |  |  |  |  |  |  |  |  |  |
Tax expense at statutory rate (34%) |  |  |  |  |  |  |  |  | $ 4,329 | $ 3,851 | $ 2,914
Differences: |  |  |  |  |  |  |  |  |  |  |
State income tax, net of federal income tax effect |  |  |  |  |  |  |  |  | 494 | (283) | 428
Tax exempt interest income |  |  |  |  |  |  |  |  | (1,682) | (1,630) | (1,481)
Increase in cash surrender value of life insurance |  |  |  |  |  |  |  |  | (143) | (143) | (147)
Nondeductible interest and other expense |  |  |  |  |  |  |  |  | 103 | 119 | 141
Other, net |  |  |  |  |  |  |  |  | (1) | 23 | 24
Total | $ 613 | $ 942 | $ 866 | $ 679 | $ (377) | $ 475 | $ 916 | $ 923 | $ 3,100 | $ 1,937 | $ 1,879

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