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, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Changes in the carrying amount of the accretable yield for all purchased impaired and non-impaired loans: [Abstract]
Beginning balance	$ 41,535	$ 31,865	$ 58,066	$ 42,833
Beginning balance	227,236	114,189	293,606	158,075
Additions		21,200		21,200
Additions	9,047	130,536	9,047	130,536
Accretable yield adjustments	17,380		17,380
Accretion	(8,384)	(5,041)	(24,915)	(16,009)
Accretion	8,384	5,041	24,915	16,009
Payments and other reductions, net	(27,650)	(13,086)	(110,551)	(67,940)
Balance, ending	50,531	48,024	50,531	48,024
Balance, ending	$ 217,017	$ 236,680	$ 217,017	$ 236,680