Note 4 - Investment Securities (Details) - Amortized Cost and Estimated Fair Value of Securities Available-for-Sale by Contractual Maturity (USD $) In Thousands, unless otherwise specified	Dec. 31, 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	$ 11,706
Due in one year or less	11,524
Due after one year through five years	214,304
Due after one year through five years	214,741
Due after five years through ten years	118,631
Due after five years through ten years	122,503
Due after ten years	37,404
Due after ten years	39,530
Equity securities	6,625
Equity securities	5,542
Total investment securities available-for-sale	388,670	401,502
Total investment securities available-for-sale	$ 393,840	$ 394,750