Note 6 - Investment Securities (Detail) - Investments by Contractual Maturity Date (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013		Dec. 31, 2012
Due in one year or less	$ 299,974
Due in one year or less	300,139
Due after one year through five years	186,517
Due after one year through five years	184,546
Due after five years through ten years	222,033
Due after five years through ten years	221,132
Due after ten years (1)	1,441,262	[1]
Due after ten years (1)	1,484,479	[1]
Total	2,149,786		1,290,676
Total	$ 2,190,296

[1] Equity securities are reported in this category