Note 13 - Accumulated Other Comprehensive Income (Details) - Significant Amounts Reclassified Out of Accumulated Other Comprehensive Income by Component (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Note 13 - Accumulated Other Comprehensive Income (Details) - Significant Amounts Reclassified Out of Accumulated Other Comprehensive Income by Component [Line Items]
Tax Expense	$ 7,060		$ 6,024		$ 21,585		$ 16,498
Net of Tax			916				1,419
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Unrealized Investment Gain (Loss) [Member]
Note 13 - Accumulated Other Comprehensive Income (Details) - Significant Amounts Reclassified Out of Accumulated Other Comprehensive Income by Component [Line Items]
Available for Sale Securities	5,216		96		5,216		2,972
Tax Expense	(2,238)		(42)		(2,238)		(1,299)
Net of Tax	2,978		54		2,978		1,673
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment [Member]
Note 13 - Accumulated Other Comprehensive Income (Details) - Significant Amounts Reclassified Out of Accumulated Other Comprehensive Income by Component [Line Items]
Tax Expense	71		130		248		391
Net of Tax	(92)		(168)		(243)		(503)
Amortization of defined benefit pension items, Actuarial losses	(175)	[1]	(309)	[1]	(525)	[1]	(927)	[1]
Amortization of defined benefit pension items, Prior service credits	12	[1]	11	[1]	34	[1]	33	[1]
Amortization of defined benefit pension items, Total before tax	(163)		(298)		(491)		(894)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Other-than-Temporary Impairment [Member]
Note 13 - Accumulated Other Comprehensive Income (Details) - Significant Amounts Reclassified Out of Accumulated Other Comprehensive Income by Component [Line Items]
Tax Expense			400				620
Net of Tax			(516)				(799)
Net of Tax			$ (916)				$ (1,419)

[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".)