Note 8 - Goodwill and Other Intangible Assets (Detail) - Changes in the Carrying Amount of Goodwill (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2010		Dec. 31, 2011	Dec. 31, 2008
Balance at December 31, 2008	$ 262,886		$ 265,477	$ 262,886
Balance			265,477	262,886
Adjustment to goodwill recorded in 2010 (1)	(5,350)	[1]
Goodwill acquired through FDIC-assisted transaction	7,941
Scenario, Previously Reported [Member]
Balance	$ 270,827

[1] Goodwill was adjusted based on additional information received in 2011 relating to the acquisition date value of certain assets and liabilities. Refer to Note 1, "Summary of Significant Accounting Policies," for further details of this adjustment.