Note 3 - Securities (Detail) - Credit-Related CDO Impairment Losses (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Jan. 02, 2009	Dec. 31, 2008
Credit-Related CDO Impairment Losses	$ 936	$ 4,664	$ 24,509	$ 18,500	$ 6,330	[1]
No 1 [Member] | Life-to-Date [Member]
Credit-Related CDO Impairment Losses	10,360
No 1 [Member]
Credit-Related CDO Impairment Losses			8,474		1,886	[1]
No 2 [Member] | Life-to-Date [Member]
Credit-Related CDO Impairment Losses	7,868
No 2 [Member]
Credit-Related CDO Impairment Losses	525	794	6,549			[1]
No 3 [Member] | Life-to-Date [Member]
Credit-Related CDO Impairment Losses	1,570
No 3 [Member]
Credit-Related CDO Impairment Losses	411	142	1,017			[1]
No 4 [Member] | Life-to-Date [Member]
Credit-Related CDO Impairment Losses	1,078
No 4 [Member]
Credit-Related CDO Impairment Losses		684	394			[1]
No 5 [Member] | Life-to-Date [Member]
Credit-Related CDO Impairment Losses	8,570
No 5 [Member]
Credit-Related CDO Impairment Losses		2,801	5,769			[1]
No 6 [Member] | Life-to-Date [Member]
Credit-Related CDO Impairment Losses	243
No 6 [Member]
Credit-Related CDO Impairment Losses		243				[1]
No 7 [Member] | Life-to-Date [Member]
Credit-Related CDO Impairment Losses	6,750
No 7 [Member]
Credit-Related CDO Impairment Losses			2,306		4,444	[1]
Life-to-Date [Member]
Credit-Related CDO Impairment Losses	$ 36,439

[1] Amount is shown net of an $18.5 million adjustment recorded on January 1, 2009 pursuant to the adoption of new accounting guidance related to the recognition of OTTI.