Note 4 - Debt and Equity Securities (Details) - Trust Preferred Issues (USD $) In Thousands, unless otherwise specified							6 Months Ended
	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Jun. 30, 2014 Single Issuer [Member]	Jun. 30, 2014 Pooled Issuer 1 [Member]	Jun. 30, 2014 Pooled Issuer 2 [Member]	Jun. 30, 2014 Trust Preferred Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Class							n/a	B1	C1
Performing Banks							1	16	15
Amortized Cost	$ 1,052,801		$ 1,032,924				$ 300	$ 5,617	$ 3,645	$ 9,562
Fair Value	1,058,682		1,017,790				290	3,040	3,250	6,580
Cumulative Credit Related OTTI	$ 3,738	$ 3,738	$ 3,738	$ 6,193	$ 6,009	$ 6,178		$ 2,383	$ 1,355	$ 3,738
Deferrals/Defaults, Actual as a Percentage of Original Security							0.00%	22.50%	21.30%
Deferrals/Defaults, Expected Percentage of Performing Collateral							0.00%	0.00%	0.00%
Current Lowest Rating							BB-	C	C