Note 3 - Securities (Details) - Securities Gains (Losses) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
Securities Gains (Losses) [Abstract]
Proceeds from sales	$ 19,745		$ 9,397		$ 19,745		$ 12,059
Gross realized gains	216		1,556		216		1,603
Gross realized losses	0		0		0		(253)
Net realized gains on securities sales	216		1,556		216		1,350
Other-than-temporary securities impairment (“OTTI”)	0		(1,591)		0		(2,328)
Portion of OTTI recognized in other comprehensive loss	0		186		0		186
Net non-cash impairment charges	0		(1,405)		0		(2,142)
Net realized gains (losses)	216		151		216		(792)
Income tax (expense) benefit on net realized gains (losses)	(88)		(62)		(88)		324
Net amount reclassified from accumulated other comprehensive loss	128		89		128		(468)
Net trading gains (losses)(1)	$ 214	[1]	$ (575)	[1]	$ 1,250	[1]	$ 826	[1]

[1] All net trading gains relate to trading securities still held as of June 30, 2013 and June 30, 2012.