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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, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Total income tax provision $ 7,693 $ 5,291 $ 6,775 $ 5,254 $ 8,116 $ 6,655 $ 20,717 $ 5,615 $ 25,013 $ 41,103 $ 27,167
Net income, as reported 5,957 10,179 12,725 12,260 14,286 10,634 30,435 9,561 41,121 64,916 46,209
Total before tax $ 13,650 $ 15,470 $ 19,500 $ 17,514 $ 22,402 $ 17,289 $ 51,152 $ 15,176 66,134 106,019 73,376
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]                      
Unrealized gains (losses) on available for sale securities                 (186) 1,524 167
Total income tax provision                 78 (638) (72)
Net income, as reported                 (108) 886 95
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]                      
Total income tax provision                 237 220  
Net income, as reported                 (323) (303)  
Total before tax                 (560) (523) (643)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Actuarial Losses [Member]                      
Other expense [1]                 (605) (568) (1,178)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Prior Service Credits [Member]                      
Other expense [1]                 $ 45 $ 45 46
Accumulated Other-than-Temporary Impairment Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]                      
Total income tax provision                     (1,132)
Net income, as reported                     $ 489
[1] These accumulated other comprehensive loss 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").