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	Jun. 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	$ 9,498
Due in one year or less	9,349
Due after one year through five years	202,245
Due after one year through five years	201,228
Due after five years through ten years	119,304
Due after five years through ten years	122,291
Due after ten years	44,847
Due after ten years	46,537
Equity securities	4,470
Equity securities	4,014
Total investment securities available-for-sale	380,364	401,502
Total investment securities available-for-sale	$ 383,419	$ 394,750