Note 6 - Investment Securities (Detail) - Schedule of Investments by Contractual Maturity Date (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012		Dec. 31, 2011
Due in one year or less	$ 32,843
Due in one year or less	32,873
Due in one year or less	99,988
Due in one year or less	100,433
Due after one year through five years	255,162
Due after one year through five years	254,378
Due after one year through five years	0
Due after one year through five years	0
Due after five years through ten years	393,762
Due after five years through ten years	369,662
Due after five years through ten years	50,183
Due after five years through ten years	52,556
Due after ten years (1)	491,379	[1]
Due after ten years (1)	509,870	[1]
Due after ten years (1)	869,806	[1]
Due after ten years (1)	920,088	[1]
Total	1,173,146		1,309,521
Total	1,166,783
Total	1,019,977
Total	$ 1,073,077

[1] Equity securities are reported in this category