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Note 6 - Investment Securities (Details) - Investments by Contractual Maturity Date (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Investments by Contractual Maturity Date [Abstract]    
Due in one year or less $ 450,032  
Due in one year or less 450,048  
Due after one year through five years 138,285  
Due after one year through five years 139,329  
Due after five years through ten years 85,857  
Due after five years through ten years 85,165  
Due after ten years (1) 680,711 [1]  
Due after ten years (1) 665,447 [1]  
Total 1,354,885 1,637,965
Total $ 1,339,989 $ 1,586,668
[1] Equity securities are reported in this category