Note 5 - Covered Assets (Detail) - Changes in Accretable Yield (USD $) In Thousands, unless otherwise specified	6 Months Ended		3 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012		Jun. 30, 2011
Balance at beginning of period	$ 52,147	$ 63,616	$ 41,045		$ 51,010
Accretion	(11,181)	(20,528)	(5,794)		(12,104)
Net reclassifications from non-accretable difference (1)	8,014	12,518	13,729	[1]	16,700	[1]
Balance at end of period	$ 48,980	$ 55,606	$ 48,980		$ 55,606

[1] Amount represents an increase in the estimated cash flows to be collected over the remaining estimated life of the underlying covered loan portfolios.