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		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Changes in the carrying amount of the accretable yield for all purchased impaired and non-impaired loans: [Abstract]
Beginning balance	$ 49,396	$ 36,860	$ 58,066	$ 42,833
Beginning balance	260,282	129,755	293,606	158,075
Accretion	(7,861)	(4,994)	(16,531)	(10,967)
Accretion	7,861	4,994	16,531	10,967
Payments and other reductions, net	(40,907)	(20,560)	(82,901)	(54,853)
Balance, ending	41,535	31,866	41,535	31,866
Balance, ending	$ 227,236	$ 114,189	$ 227,236	$ 114,189