Note 4 - Debt and Equity Securities (Details) - Securities Available for Sale by Contractual Maturity (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Note 4 - Debt and Equity Securities (Details) - Securities Available for Sale by Contractual Maturity [Line Items]
Due in one year or less	$ 42,511
Due in one year or less	42,705
Due after one year through five years	42,142
Due after one year through five years	44,072
Due after five years through ten years	59,017
Due after five years through ten years	58,257
Due after ten years	138,210
Due after ten years	134,130
Securities Available for Sale, Amortized Cost	1,058,903
Securities Available for Sale, Fair Value	1,053,366	1,017,790
Available For Sale Securities Excluding Mortgage Backed Securities [Member]
Note 4 - Debt and Equity Securities (Details) - Securities Available for Sale by Contractual Maturity [Line Items]
Securities Available for Sale, Amortized Cost	281,880
Securities Available for Sale, Fair Value	279,164	261,634
Collateralized Mortgage Backed Securities [Member]
Note 4 - Debt and Equity Securities (Details) - Securities Available for Sale by Contractual Maturity [Line Items]
Securities Available for Sale, Amortized Cost	777,023
Securities Available for Sale, Fair Value	$ 774,202	$ 756,156