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Note 14 - Accumulated Other Comprehensive Income (Loss) (Details) - Amounts Reclassified Out of Accumulated Other Comprehensive Income (Loss) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Note 14 - Accumulated Other Comprehensive Income (Loss) (Details) - Amounts Reclassified Out of Accumulated Other Comprehensive Income (Loss) [Line Items]        
Tax expense $ (6,661) $ (7,060) $ (21,728) $ (21,585)
Unrealized gains on available for sale securities 11,008 11,201 34,575 33,182
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]        
Note 14 - Accumulated Other Comprehensive Income (Loss) (Details) - Amounts Reclassified Out of Accumulated Other Comprehensive Income (Loss) [Line Items]        
Unrealized gains on available for sale securities before tax 103 5,216 167 5,216
Tax expense (45) (2,238) (73) (2,238)
Unrealized gains on available for sale securities 58 2,978 94 2,978
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]        
Note 14 - Accumulated Other Comprehensive Income (Loss) (Details) - Amounts Reclassified Out of Accumulated Other Comprehensive Income (Loss) [Line Items]        
Tax expense (167) (92) (499) (243)
Amortization (accretion) of defined benefit pension items:        
Actuarial losses [1] (307) (175) (920) (525)
Prior service credits [1] 11 12 34 34
Total before tax (296) (163) (886) (491)
Net of tax $ 129 $ 71 $ 387 $ 248
[1] These accumulated other comprehensive income (loss) components are included in the computation of net periodic pension cost (See Note 10 of the Notesto Consolidated Financial Statements "Pension and Other Postretirement Benefit Plans".)