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8. Income Taxes (Details 1) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Taxes Details 1 |  |  |  |  |  |  |  |  |  |  |
Tax expense at statutory rate (34%) |  |  |  |  |  |  |  |  | $ 3,991 | $ 4,329 | $ 3,851
Differences: |  |  |  |  |  |  |  |  |  |  |
State income tax, net of federal income tax effect |  |  |  |  |  |  |  |  | 339 | 494 | (283)
Tax exempt interest income |  |  |  |  |  |  |  |  | (1,681) | (1,682) | (1,630)
Increase in cash surrender value of life insurance |  |  |  |  |  |  |  |  | (138) | (143) | (143)
Nondeductible interest and other expense |  |  |  |  |  |  |  |  | 78 | 103 | 119
Other, net |  |  |  |  |  |  |  |  | (28) | (1) | 23
Total income tax | $ (36) | $ 872 | $ 1,032 | $ 691 | $ 613 | $ 942 | $ 866 | $ 679 | $ 2,561 | $ 3,100 | $ 1,937

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