Note 6 - Debt and Equity Securities (Details) - Securities Available For Sale by Contractual Maturity (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Securities Available For Sale by Contractual Maturity [Abstract]
Due in one year or less	$ 32,424
Due in one year or less	32,561
Due after one year through five years	30,945
Due after one year through five years	32,462
Due after five years through ten years	64,075
Due after five years through ten years	63,367
Due after ten years	140,610
Due after ten years	133,244
Total other securities	268,054
Total other securities	261,634	229,453
Mortgage-backed securities	764,870
Mortgage-backed securities	756,156	720,113
Total securities available for sale	1,032,924	915,947
Total securities available for sale	$ 1,017,790	$ 949,566