Note 3 - Securities (Detail) - Remaining Contractual Maturity of Securities (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Total	$ 1,013,006	$ 1,057,802
Total	60,458	81,320
Total	61,477	82,525
Amortized Cost [Member]
One year or less	7,327
One year to five years	336,726
Five years to ten years	111,698
After ten years	89,861
CMOs	383,828
Other residential mortgage-backed securities	81,982
Equity securities	2,189
Total	1,013,611
Fair Value [Member]
One year or less	7,232
One year to five years	332,345
Five years to ten years	110,245
After ten years	88,692
CMOs	384,104
Other residential mortgage-backed securities	87,691
Equity securities	2,697
Total	1,013,006
Amortized Cost [Member]
One year or less	4,301
One year to five years	20,582
Five years to ten years	13,081
After ten years	22,494
Total	60,458
Fair Value [Member]
One year or less	4,374
One year to five years	20,929
Five years to ten years	13,302
After ten years	22,872
Total	$ 61,477