Note 3 - Investment Securities (Details) - Maturities of Investment Securities (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Maturities of Investment Securities [Abstract]
One year or less	$ 29,768
One year or less	29,879
One year or less	350
One year or less	350
After one through five years	188,430
After one through five years	186,541
After one through five years	55,674
After one through five years	55,216
After five through ten years	240,321
After five through ten years	234,222
After five through ten years	110,092
After five through ten years	106,032
After ten years	96,945
After ten years	92,512
After ten years	1,043
After ten years	1,132
Other securities	0
Other securities	0
Other securities	14,337
Other securities	14,801
Total	555,464	496,141
Total	543,154	500,578
Total	181,496
Total	$ 177,531	$ 191,342