Note 6 - Debt and Equity Securities (Details) - Gross Unrealized Losses Recorded in AOCI and the Ending Credit Loss Amount on Debt Securities (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Note 6 - Debt and Equity Securities (Details) - Gross Unrealized Losses Recorded in AOCI and the Ending Credit Loss Amount on Debt Securities [Line Items]
Fair Value	$ 1,017,790		$ 949,566
Ending Credit Loss Amount	3,738		6,178	6,922	7,011
Credit Related OTTI Charge In The Consolidated Statements of Income [Member] | Trust Preferred Securities [Member]
Note 6 - Debt and Equity Securities (Details) - Gross Unrealized Losses Recorded in AOCI and the Ending Credit Loss Amount on Debt Securities [Line Items]
Amortized Cost	9,262	[1]
Fair Value	6,050	[1]
Gross Unrealized Losses Recorded In AOCI	3,212	[1]
Ending Credit Loss Amount	3,738	[1]
Credit Related OTTI Charge In The Consolidated Statements of Income [Member]
Note 6 - Debt and Equity Securities (Details) - Gross Unrealized Losses Recorded in AOCI and the Ending Credit Loss Amount on Debt Securities [Line Items]
Amortized Cost	9,262
Fair Value	6,050
Gross Unrealized Losses Recorded In AOCI	3,212
Ending Credit Loss Amount	$ 3,738

[1] The Company has recorded OTTI charges in the Consolidated Statements of Income on two pooled trust preferred securities for which a portion of the OTTI iscurrently recorded in AOCI.