Note 7 - Investment Securities (Details) - Pooled Trust Preferred Securities (USD $)	3 Months Ended
	Mar. 31, 2014		Dec. 31, 2013
Note 7 - Investment Securities (Details) - Pooled Trust Preferred Securities [Line Items]
Book value	$ 361,947,000		$ 393,840,000
Available-for-sale Securities	359,452,000		388,670,000
PreTSL IV [Member]
Note 7 - Investment Securities (Details) - Pooled Trust Preferred Securities [Line Items]
Class	Mezzanine*	[1]
Book value	243,000	[1]
Available-for-sale Securities	202,000	[1]
Unrealized gains (losses)	(41,000)	[1]
Total recognized OTTI credit loss	(1,000)	[1]
Moody's/Fitch ratings	B1/B	[1]
Current number of performing banks	5	[1]
Actual deferrals and defaults as a % of total collateral	18.00%	[1]
Total performing collateral as a % of outstanding bonds	139.80%	[1]
PreTSL V [Member]
Note 7 - Investment Securities (Details) - Pooled Trust Preferred Securities [Line Items]
Class	Mezzanine*
Total recognized OTTI credit loss	(118,000)	[1]
Moody's/Fitch ratings	C/D	[1]
Actual deferrals and defaults as a % of total collateral	100.00%	[1]
Total performing collateral as a % of outstanding bonds	12.70%	[1]
PreTSL XVII [Member]
Note 7 - Investment Securities (Details) - Pooled Trust Preferred Securities [Line Items]
Class	Mezzanine
Book value	752,000
Available-for-sale Securities	456,000
Unrealized gains (losses)	(296,000)
Total recognized OTTI credit loss	(222,000)
Moody's/Fitch ratings	C/C
Current number of performing banks	32
Current number of performing insurance companies	5
Actual deferrals and defaults as a % of total collateral	29.10%
Total performing collateral as a % of outstanding bonds	84.20%
PreTSL XIX [Member]
Note 7 - Investment Securities (Details) - Pooled Trust Preferred Securities [Line Items]
Class	Mezzanine
Book value	988,000
Available-for-sale Securities	469,000
Unrealized gains (losses)	(519,000)
Total recognized OTTI credit loss	0
Moody's/Fitch ratings	C/C
Current number of performing banks	38
Current number of performing insurance companies	12
Actual deferrals and defaults as a % of total collateral	20.30%
Total performing collateral as a % of outstanding bonds	85.70%
PreTSL XXV [Member]
Note 7 - Investment Securities (Details) - Pooled Trust Preferred Securities [Line Items]
Class	Mezzanine
Book value	766,000
Available-for-sale Securities	379,000
Unrealized gains (losses)	(387,000)
Total recognized OTTI credit loss	(222,000)
Moody's/Fitch ratings	C/C
Current number of performing banks	45
Current number of performing insurance companies	6
Actual deferrals and defaults as a % of total collateral	29.30%
Total performing collateral as a % of outstanding bonds	86.10%
PreTSL XXVI [Member]
Note 7 - Investment Securities (Details) - Pooled Trust Preferred Securities [Line Items]
Class	Mezzanine
Book value	469,000
Available-for-sale Securities	310,000
Unrealized gains (losses)	(159,000)
Total recognized OTTI credit loss	(270,000)
Moody's/Fitch ratings	C/C
Current number of performing banks	40
Current number of performing insurance companies	7
Actual deferrals and defaults as a % of total collateral	29.00%
Total performing collateral as a % of outstanding bonds	86.00%
PreTSL XXVII [Member]
Note 7 - Investment Securities (Details) - Pooled Trust Preferred Securities [Line Items]
Class	Mezzanine
Book value	301,000
Available-for-sale Securities	422,000
Unrealized gains (losses)	121,000
Total recognized OTTI credit loss	(438,000)
Moody's/Fitch ratings	C/C
Current number of performing banks	40
Current number of performing insurance companies	7
Actual deferrals and defaults as a % of total collateral	29.00%
Total performing collateral as a % of outstanding bonds	86.00%
Pooled Trust Preferred Securities [Member]
Note 7 - Investment Securities (Details) - Pooled Trust Preferred Securities [Line Items]
Book value	3,519,000		3,519,000
Available-for-sale Securities	2,238,000		2,069,000
Unrealized gains (losses)	(1,281,000)
Total recognized OTTI credit loss	$ (1,271,000)

[1] Mezzanine* - only class of bonds still outstanding (represents the senior-most obligation of the trust)