Note 6 - Investment Securities (Details) - Investments by Contractual Maturity Date (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
Investments by Contractual Maturity Date [Abstract]
Due in one year or less	$ 115,047
Due in one year or less	115,156
Due after one year through five years	446,739
Due after one year through five years	447,662
Due after five years through ten years	85,693
Due after five years through ten years	84,983
Due after ten years (1)	707,577	[1]
Due after ten years (1)	692,291	[1]
Total	1,355,056		1,637,965
Total	$ 1,340,092		$ 1,586,668

[1] Equity securities are reported in this category