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Note 12 - 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, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Net loss on sale of securities |  | $ 618 |  | $ 618 | $ 657
Income before income taxes |  | 10,218 | 11,546 | 33,220 | 30,180
Income tax expense |  | 1,118 | 3,894 | 6,186 | 9,908
Net income |  | 9,100 | 7,652 | 27,034 | 20,272
Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |  |
Net income |  | 545 | 41 | 657 | 532
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] |  |  |  |  |
Net loss on sale of securities |  | 618 |  | 618 | 657
Income before income taxes |  | 618 |  | 618 | 657
Income tax expense |  | 130 |  | 130 | 246
Net income |  | 488 |  | 488 | 411
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member] |  |  |  |  |
Amortization | [1] | 57 | 57 | 171 | 171
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member] |  |  |  |  |
Amortization | [1] | 15 | 8 | 43 | 23
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |  |  |  |
Income before income taxes |  | 72 | 65 | 214 | 194
Income tax expense |  | 15 | 24 | 45 | 73
Net income |  | $ 57 | $ 41 | $ 169 | $ 121
[1] | Amortization is included in net periodic pension cost. See Note 10, "Employee Benefit Plans."

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- Definition Amount of realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/recommendedDisclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 + Details
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109238882&loc=d3e38679-109324 + Details
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