Note 7 - Investment Securities (Details) - Investment Securities by Contractual Maturity - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Investment Securities by Contractual Maturity [Abstract]
Due in one year or less	$ 5,129
Due in one year or less	5,076
Due after one year through five years	230,192
Due after one year through five years	229,515
Due after five years through ten years	64,725
Due after five years through ten years	64,452
Due after ten years	22,566
Due after ten years	23,327
Equity securities	7,619
Equity securities	7,417
Total investment securities available-for-sale	330,231	$ 375,219
Total investment securities available-for-sale	329,787	373,844
Due after one year through five years	154
Due after one year through five years	146
Total investment securities held-to-maturity	154	156
Total investment securities held-to-maturity	$ 146	$ 146