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Note 13 - Accumulated Other Comprehensive Income - Amounts Reclassified 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 Income $ 12,725 $ 30,435 $ 24,985 $ 39,996
Other expense (3,185) (4,419) (8,108) (8,955)
Total before tax 19,500 51,152 37,014 66,328
Tax benefit (6,775) (20,717) (12,029) (26,332)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]        
Net Income   1,350   1,350
Unrealized gains on available for sale securities:   2,363   2,363
Tax benefit   (1,013)   (1,013)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member]        
Other expense (151) [1]   (302) [1] (384)
Other expense   (192)    
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member]        
Other expense 11 [1]   22 [1] 23
Other expense   12    
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]        
Net Income (81) (103) (161) (206)
Total before tax (140) (180) (280) (361)
Tax benefit $ 59 $ 77 $ 119 $ 155
[1] These accumulated other comprehensive income components are included in the computation of net periodic pension cost (See Note 9 of the Notes to Consolidated Financial Statements "Pension and Other Postretirement Benefit Plans".)