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, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Note 13 - Accumulated Other Comprehensive Income (Details) - Significant amounts reclassified out of accumulated other comprehensive income by component: [Line Items]
Tax expense	$ 6,024	$ 5,988	$ 16,498	$ 16,065
Net of tax	9,421	9,365	25,804	25,131
OTTI charges	916		1,419	776
	15,445	15,353	42,302	41,196
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Note 13 - Accumulated Other Comprehensive Income (Details) - Significant amounts reclassified out of accumulated other comprehensive income by component: [Line Items]
Unrealized gains (losses) on available for sale securities:	96		2,972
Tax expense	(42)		(1,299)
Net of tax	54		1,673
Accumulated Other-than-Temporary Impairment [Member] | Reclassification out of Accumulated Other Comprehensive Income [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)
OTTI charges	(916)		(1,419)
Accumulated Defined Benefit Plans Adjustment [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Note 13 - Accumulated Other Comprehensive Income (Details) - Significant amounts reclassified out of accumulated other comprehensive income by component: [Line Items]
Tax expense	130		391
Net of tax	(168)		(503)
Actuarial losses	(309)		(927)
Prior service credits	11		33
	$ (298)		$ (894)