Note 7 - Investment Securities (Details) - Investment Securities by Contractual Maturity - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Investment Securities by Contractual Maturity [Abstract]
Due in one year or less	$ 5,954
Due in one year or less	5,910
Due after one year through five years	245,136
Due after one year through five years	243,167
Due after five years through ten years	82,140
Due after five years through ten years	81,254
Due after ten years	22,246
Due after ten years	22,785
Equity securities	7,092
Equity securities	7,544
Total investment securities available-for-sale	362,568	$ 375,219
Total investment securities available-for-sale	360,660	373,844
Due in one year or less
Due after one year through five years	153
Due after one year through five years	147
Total investment securities held-to-maturity	153	156
Total investment securities held-to-maturity	$ 147	$ 146