Note 5 - Covered Assets (Detail) - Changes in FDIC Indemnification Asset (USD $) In Thousands, unless otherwise specified	12 Months Ended				12 Months Ended
	Dec. 31, 2009		Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011		Dec. 31, 2010
Balance at beginning of year			$ 65,609	$ 95,899	$ 95,899		$ 67,945
Additions	67,945						58,868
Accretion (amortization)					(11,495)		(4,596)
Expected reimbursements from the FDIC for changes in expected credit losses (1)		[1]			39,096	[1]	30,982	[1]
Payments received from the FDIC					(57,891)		(57,300)
Balance at end of year	$ 67,945		$ 65,609	$ 95,899	$ 65,609		$ 95,899

[1] The increases in indemnification asset were a result of decreases in estimated cash flows on certain loans. The indemnification asset increased by the applicable loss share percentage for additional expected losses.