Note 3 - Investment Securities (Details) - Maturities of Investment Securities (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Maturities of Investment Securities [Abstract]
One year or less	$ 23,361
One year or less	23,427
One year or less	2,257
One year or less	2,261
After one through five years	341,201
After one through five years	339,224
After one through five years	161,497
After one through five years	160,697
After five through ten years	239,939
After five through ten years	239,203
After five through ten years	90,093
After five through ten years	88,119
After ten years	195,462
After ten years	198,547
After ten years	808
After ten years	882
Other securities	17,893
Other securities	18,377
Total	799,963	745,688
Total	800,401	731,445
Total	272,548	217,217
Total	$ 270,336	$ 212,277