Note 3 - Securities (Detail) - Changes In Credit Losses Recognized In Earnings (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Cumulative amount recognized at beginning of year	$ 35,589		$ 30,839		$ 6,330
Cumulative amount recognized at end of year	36,525		35,589		30,839
Credit losses included in earnings (1):
Losses recognized on securities that previously had credit losses	936	[1]	4,421	[1]	11,797	[1]
Losses recognized on securities that did not previously have credit losses		[1]	$ 329	[1]	$ 12,712	[1]

[1] Included in securities gains, net in the Condensed Consolidated Statements of Income.