Note 4 - Debt and Equity Securities (Details) - Gross Unrealized Losses Recorded in AOCI (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014		Mar. 31, 2014	Dec. 31, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012
Note 4 - Debt and Equity Securities (Details) - Gross Unrealized Losses Recorded in AOCI [Line Items]
Amortized Cost	$ 1,052,801
Fair Value	1,058,682			1,017,790
Ending Credit Loss Amount	3,738		3,738	3,738	6,193	6,009	6,178
Credit Related OTTI Charge In The Consolidated Statements Of Income [Member] | Trust Preferred Securities [Member]
Note 4 - Debt and Equity Securities (Details) - Gross Unrealized Losses Recorded in AOCI [Line Items]
Amortized Cost	9,262	[1]
Fair Value	6,290	[1]
Gross Unrealized Losses Recorded In AOCI	2,972	[1]
Ending Credit Loss Amount	3,738	[1]
Credit Related OTTI Charge In The Consolidated Statements Of Income [Member]
Note 4 - Debt and Equity Securities (Details) - Gross Unrealized Losses Recorded in AOCI [Line Items]
Amortized Cost	9,262
Fair Value	6,290
Gross Unrealized Losses Recorded In AOCI	2,972
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 portionof the unrealized losses are currently recorded in AOCI.