Note 3 - Investment Securities (Detail) - Maturities of Investment Securities (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
One year or less	$ 35,145
One year or less	35,298
One year or less	300
One year or less	300
After one through five years	275,496
After one through five years	276,371
After one through five years	105,100
After one through five years	105,275
After five through ten years	141,053
After five through ten years	142,900
After five through ten years	45,534
After five through ten years	45,751
After ten years	73,828
After ten years	76,931
After ten years	4
After ten years	4
Other securities	0
Other securities	0
Other securities	15,202
Other securities	15,636
Total	525,522
Total	531,500
Total	166,140
Total	$ 166,966	$ 172,212