Note 3 - Securities (Detail) - Securities Gains (Losses) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2012		Sep. 30, 2011
Proceeds from sales	$ 38,574		$ 80,126		$ 50,633		$ 177,456
(Losses) gains on sales of securities:
Gross realized gains	131		671		1,734		3,453
Gross realized losses	(348)		(45)		(601)		(756)
Net realized (losses) gains on securities sales	(217)		626		1,133		2,697
Non-cash impairment charges:
Other-than-temporary impairment (“OTTI”)			(641)		(2,328)		(641)
Portion of OTTI recognized in other comprehensive income			464		186		464
Net non-cash impairment charges			(177)		(2,142)		(177)
Net realized (losses) gains	(217)		449		(1,009)		2,520
Income tax (benefit) expense on net realized (losses) gains	(89)		184		(413)		1,031
Net trading gains (losses) (1)	$ 685	[1]	$ (2,352)	[1]	$ 1,511	[2]	$ (1,610)	[2]

[1] All trading gains (losses), net relate to trading securities still held as of September 30, 2012 and September 30, 2011.

[2] All trading (losses) gains, net relate to trading securities still held as of September 30, 2012 and September 30, 2011.