Note 9 - Fair Value Measurements (Detail) (USD $) In Thousands, unless otherwise specified											3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2013 Purchased Covered Loans [Member]	Dec. 31, 2012 Purchased Covered Loans [Member]	Mar. 31, 2012 Purchased Covered Loans [Member]	Mar. 31, 2013 Purchased Non-Covered Loans [Member]	Dec. 31, 2012 Purchased Non-Covered Loans [Member]	Mar. 31, 2013 Fair Value, Inputs, Level 2 [Member]
Fair Value Inputs, Discount Rate											10.00%
Loans and Leases Receivable, Allowance	$ 30,354	$ 30,234	$ 30,354	$ 31,883	$ 32,597	$ 738	$ 1,005	$ 139
Fair Value Discount, Credit Default Risk, Purchased Loans						$ 22,660	$ 26,128		$ 4,587	$ 5,226