Note 3 - Investment Securities (Details) - Maturities of Investment Securities (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Maturities of Investment Securities [Abstract]
One year or less	$ 29,360
One year or less	29,432
One year or less	350
One year or less	350
After one through five years	194,855
After one through five years	193,353
After one through five years	60,734
After one through five years	60,389
After five through ten years	227,380
After five through ten years	220,876
After five through ten years	109,091
After five through ten years	104,589
After ten years	129,553
After ten years	126,422
After ten years	959
After ten years	1,056
Other securities	620
Other securities	620
Other securities	13,082
Other securities	13,553
Total	581,768	496,141
Total	570,703	500,578
Total	184,216
Total	$ 179,937	$ 191,342