Note 6 - Past Due Loans, Allowance For Credit Losses, and Impaired Loans (Detail) - Impaired Loans Individually Evaluated by Class (Continued) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Average recorded investment in impaired loans	$ 172,314		$ 203,118		$ 217,872
Interest income recognized on impaired loans (4)	$ 596	[1]	$ 244	[1]	$ 157	[1]

[1] Recorded using the cash basis of accounting.