Note 4 - Debt and Equity Securities (Details) - Gross Unrealized Losses Recorded in AOCI: (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012
Note 4 - Debt and Equity Securities (Details) - Gross Unrealized Losses Recorded in AOCI: [Line Items]
Amortized Cost	$ 1,058,903
Fair Value	1,053,366		1,017,790
Cumulative Credit OTTI Losses	3,738		3,738	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	6,020	[1]
Gross Unrealized Losses Recorded In AOCI	3,242	[1]
Cumulative Credit OTTI Losses	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	6,020
Gross Unrealized Losses Recorded In AOCI	3,242
Cumulative Credit OTTI Losses	$ 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.