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Note 13 - Accumulated Other Comprehensive Income (Loss) - Reclassifications Out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Net loss on sale of securities |  |  | $ (618) | $ (43) | $ (618)
Income before income taxes |  | 11,736 | 10,218 | 37,399 | 33,220
Income tax expense |  | 2,580 | 1,118 | 8,161 | 6,186
Net income |  | 9,156 | 9,100 | 29,238 | 27,034
Net income |  | 55 | 545 | 199 | 657
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member] |  |  |  |  |
Income before income taxes | [1] | 65 | 57 | 193 | 171
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member] |  |  |  |  |
Income before income taxes | [1] | 5 | 15 | 16 | 43
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |  |  |  |
Income before income taxes |  | 70 | 72 | 209 | 214
Reclassification out of Accumulated Other Comprehensive Income [Member] | AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member] |  |  |  |  |
Net loss on sale of securities |  |  | 618 | 43 | 618
Income before income taxes |  |  | 618 | 43 | 618
Income tax expense |  |  | 130 | 9 | 130
Net income |  |  | 488 | 34 | 488
Income tax expense |  | 15 | 15 | 44 | 45
Net income |  | $ 55 | $ 57 | $ 165 | $ 169
[1] | Amortization is included in net periodic pension cost. See Note 11, "Employee Benefit Plans."

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