Note 11 - Fair Value (Detail) - Carrying Value of Level 3 Securities Available-for-Sale (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Beginning balance	$ 12,129		$ 13,394
Included in earnings (1)		[1]	(721)	[1]
Included in other comprehensive income (2)	795	[2]	1,012	[2]
Ending balance (3)	12,924	[3]	13,685	[3]
Change in unrealized losses recognized in earnings related to securities still held at end of period			$ (721)

[1] Included in net securities losses in the Condensed Consolidated Statements of Income and related to securities still held at the end of the period.

[2] Included in unrealized holding (losses) gains in the Consolidated Statements of Comprehensive Income.

[3] There were no purchases, sales, issuances, or settlements of CDOs during the periods presented.