Note 7 - Investment Securities (Details) - Amortized Cost and Estimated Fair Value of Securities Available-for-Sale by Contractual Maturity (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Amortized Cost and Estimated Fair Value of Securities Available-for-Sale by Contractual Maturity [Abstract]
Due in one year or less	$ 7,863
Due in one year or less	7,770
Due after one year through five years	207,044
Due after one year through five years	205,227
Due after five years through ten years	145,966
Due after five years through ten years	149,662
Due after ten years	41,491
Due after ten years	43,210
Equity securities	4,884
Equity securities	4,375
Total investment securities available-for-sale	407,248	401,502
Total investment securities available-for-sale	$ 410,244	$ 394,750