Note 5 - Loans Acquired (Details) - Changes in the Carrying Amount of the Accretable Yield for All Purchased Impaired and Non-Impaired Loans - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Changes in the Carrying Amount of the Accretable Yield for All Purchased Impaired and Non-Impaired Loans [Abstract]
Beginning balance	$ 17,226	$ 33,542	$ 20,635	$ 41,385
Beginning balance	177,691	218,532	169,098	234,785
Additions			(116)
Additions			17,750
Accretable yield adjustments	2,369	3,928	5,443	5,411
Accretion	(4,547)	(6,180)	(10,914)	(15,506)
Accretion	4,547	6,180	10,914	15,506
Payments and other reductions, net	(22,144)	(32,619)	(37,668)	(58,198)
Balance, ending	15,048	31,290	15,048	31,290
Balance, ending	$ 160,094	$ 192,093	$ 160,094	$ 192,093