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Note 13 - Stockholders' Equity (Details) - Amounts Reclassified Out of Accumulated Other Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]                      
Total income tax provision $ 5,439 $ 6,661 $ 9,521 $ 5,546 $ 6,988 $ 7,060 $ 7,598 $ 6,927 $ 27,167 $ 28,573 $ 22,956
Net of tax 11,634 11,008 14,834 8,733 11,057 11,201 11,685 10,296 46,209 44,239 37,752
Amortization of defined benefit pension items:                      
OTTI charges                     1,419
Amortization of defined benefit pension items:                      
Total before tax $ 17,073 $ 17,669 $ 24,355 $ 14,279 $ 18,045 $ 18,261 $ 19,283 $ 17,223 73,376 72,812 60,708
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]                      
Unrealized gains (losses) on available for sale securities                 167 2,875 3,021
Total income tax provision                 (72) (1,241) (1,321)
Net of tax                 95 1,634 1,700
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]                      
Total income tax provision                 489 311 521
Net of tax                 (643) (344) (670)
Amortization of defined benefit pension items:                      
Total before tax                 (1,132) (655) (1,191)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Other-than-Temporary Impairment Attributable to Parent [Member]                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]                      
Total income tax provision                     621
Net of tax                     (798)
Amortization of defined benefit pension items:                      
OTTI charges                     (1,419)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Actuarial Losses [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]                      
Amortization of defined benefit pension items:                      
Other expense [1]                 (1,178) (700) (1,237)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Prior Service Credits [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]                      
Amortization of defined benefit pension items:                      
Other expense [1]                 $ 46 $ 45 $ 46
[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").