Note 4 - Investment Securities (Details) - Investments by Contractual Maturity Date (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Investments by Contractual Maturity Date [Abstract]
Due in one year or less	$ 460,106
Due in one year or less	460,204
Due after one year through five years	80,769
Due after one year through five years	82,079
Due after five years through ten years	112,654
Due after five years through ten years	108,840
Due after ten years (1)	984,436	[1]
Due after ten years (1)	935,545	[1]
Total	1,637,965		1,290,676
Total	$ 1,586,668		$ 1,291,480

[1] Equity securities are reported in this category