Note 7 - Investment Securities (Details) - Investment Securities Available-for-sale by Contractual Maturity (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Investment Securities Available-for-sale by Contractual Maturity [Abstract]
Due in one year or less	$ 9,099
Due in one year or less	8,980
Due after one year through five years	231,661
Due after one year through five years	231,970
Due after five years through ten years	87,737
Due after five years through ten years	88,139
Due after ten years	26,678
Due after ten years	27,178
Equity securities	7,293
Equity securities	6,639
Total investment securities available-for-sale	362,468	388,670
Total investment securities available-for-sale	$ 362,906	$ 393,840