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Note 13 - Stockholders' Equity - Amounts Reclassified Out of Accumulated Other Comprehensive Income (Details) - 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 tax benefit $ 8,116 $ 6,655 $ 20,717 $ 5,615 $ 5,439 $ 6,661 $ 9,521 $ 5,546 $ 41,103 $ 27,167 $ 28,573
Net income, as reported 14,286 10,634 30,435 9,561 11,634 11,008 14,834 8,733 64,916 46,209 44,239
Income before income tax expense $ 22,402 $ 17,289 $ 51,152 $ 15,176 $ 17,073 $ 17,669 $ 24,355 $ 14,279 106,019 73,376 72,812
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]                      
Unrealized gains (losses) on available for sale securities:                 1,524 167 2,875
Income tax benefit                 (638) (72) (1,241)
Net income, as reported                 886 95 1,634
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]                      
Income tax benefit                 220 489  
Net income, as reported                 (303) (643)  
Income before income tax expense                 (523) (1,132) (344)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] | Actuarial Losses [Member]                      
Other expense [1]                 (568) (1,178) (700)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] | Prior Service Credits [Member]                      
Other expense [1]                 $ 45 $ 46 45
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Other-than-Temporary Impairment Attributable to Parent [Member]                      
Income tax benefit                     (655)
Net income, as reported                     $ 311
[1] These accumulated other comprehensive income components are included in the computation of net periodic pension cost (see Note 12 of the Notes to Consolidated Financial Statements "Pension and Other Postretirement Benefit Plans").