Note 4 - Debt and Equity Securities (Details) - Securities available for sale by contractual maturity: (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Note 4 - Debt and Equity Securities (Details) - Securities available for sale by contractual maturity: [Line Items]
Due in one year or less	$ 22,631
Due in one year or less	22,631
Due after one year through five years	59,412
Due after one year through five years	62,140
Due after five years through ten years	64,132
Due after five years through ten years	63,450
Due after ten years	131,866
Due after ten years	125,123
Securities Available for Sale, Amortized Cost	1,061,918
Securities Available for Sale, Fair Value	1,058,554	949,566
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	278,041
Securities Available for Sale, Fair Value	273,344	229,453
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	783,877
Securities Available for Sale, Fair Value	$ 785,210	$ 720,113