Note 6 - Debt and Equity Securities (Details) - Trust Preferred Issues (USD $) In Thousands, unless otherwise specified			12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Single Issuer [Member] Pooled Trust Preferred Securities [Member]	Dec. 31, 2013 Pooled Issuer 1 [Member] Pooled Trust Preferred Securities [Member]	Dec. 31, 2013 Pooled Issuer 2 [Member] Pooled Trust Preferred Securities [Member]	Dec. 31, 2013 Pooled Trust Preferred Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Class			n/a	B1	C1
Performing Banks			1	16	16
Amortized Cost	$ 1,032,924	$ 915,947	$ 300	$ 5,617	$ 3,645	$ 9,562
Fair Value	1,017,790	949,566	287	3,200	2,850	6,337
Cumulative Credit Related OTTI				$ 2,196	$ 1,542	$ 3,738
Deferrals/Defaults, Actual as a Percentage of Original Security				23.40%	21.30%
Deferrals/Defaults, Expected Percentage of Performing Collateral				0.00%	1.50%
Current Lowest Rating			BB-	C	C