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Note 11 - Accumulated Other Comprehensive Income - Reclassifications Out of Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Net loss on sale of securities $ (657) $ (79) $ (657) $ (78)
Net impairment losses recognized in earnings 11 11
Income before income taxes 9,377 9,277 18,634 18,290
Income tax expense 2,959 3,022 6,014 5,951
Net income 6,418 6,255 12,620 12,339
Reclassified out of AOCI, net of tax 452 97 492 141
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]        
Net loss on sale of securities 657 79 657 78
Net impairment losses recognized in earnings 11 11
Income before income taxes 657 90 657 89
Income tax expense 246 34 246 33
Net income 411 56 411 56
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member]        
Reclassified out of AOCI [1] 57 56 114 113
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member]        
Reclassified out of AOCI [1] 8 9 15 23
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]        
Reclassified out of AOCI 65 65 129 136
Income tax expense 24 24 48 51
Reclassified out of AOCI, net of tax $ 41 $ 41 $ 81 $ 85
[1] Amortization is included in net periodic pension cost. See Note 10, "Employee Benefit Plans."