Note 5 - Covered Assets (Detail) - Changes in Accretable Yield (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2009		Dec. 31, 2011		Dec. 31, 2010
Balance at beginning of year			$ 63,616		$ 9,298
Additions	10,717				41,592
Accretion	(1,419)		(36,827)		(24,804)
Reclassifications (to) from non-accretable difference, net (1)		[1]	25,358	[1]	37,530	[1]
Balance at end of year	$ 9,298		$ 52,147		$ 63,616

[1] Amount represents a (decrease) increase in the estimated cash flows to be collected over the remaining estimated life of the underlying portfolio.