Note 7 - Investment Securities (Details) - Pooled Trust Preferred Securities (USD $)	9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013	Dec. 31, 2013
Note 7 - Investment Securities (Details) - Pooled Trust Preferred Securities [Line Items]
Book value	$ 362,906,000			$ 393,840,000
Available-for-sale Securities	362,468,000			388,670,000
Total recognized OTTI credit loss	0		43,000
PreTSL IV [Member]
Note 7 - Investment Securities (Details) - Pooled Trust Preferred Securities [Line Items]
Class	Mezzanine*	[1]
Book value	243,000
Available-for-sale Securities	207,000
Unrealized gains (losses)	(36,000)
Total recognized OTTI credit loss	(1,000)
Moody's/Fitch ratings	B1/B
Current number of performing banks	5
Actual deferrals and defaults as a % of total collateral	18.00%
Total performing collateral as a % of outstanding bonds	140.10%
PreTSL V [Member]
Note 7 - Investment Securities (Details) - Pooled Trust Preferred Securities [Line Items]
Class	Mezzanine*	[1]
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	13.40%	[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	506,000
Unrealized gains (losses)	(246,000)
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	84.60%
PreTSL XIX [Member]
Note 7 - Investment Securities (Details) - Pooled Trust Preferred Securities [Line Items]
Class	Mezzanine
Book value	988,000
Available-for-sale Securities	512,000
Unrealized gains (losses)	(476,000)
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	17.20%
Total performing collateral as a % of outstanding bonds	86.80%
PreTSL XXV [Member]
Note 7 - Investment Securities (Details) - Pooled Trust Preferred Securities [Line Items]
Class	Mezzanine
Book value	766,000
Available-for-sale Securities	424,000
Unrealized gains (losses)	(342,000)
Total recognized OTTI credit loss	(222,000)
Moody's/Fitch ratings	C/C
Current number of performing banks	47
Current number of performing insurance companies	5
Actual deferrals and defaults as a % of total collateral	31.00%
Total performing collateral as a % of outstanding bonds	84.80%
PreTSL XXVI [Member]
Note 7 - Investment Securities (Details) - Pooled Trust Preferred Securities [Line Items]
Class	Mezzanine
Book value	469,000
Available-for-sale Securities	345,000
Unrealized gains (losses)	(124,000)
Total recognized OTTI credit loss	(270,000)
Moody's/Fitch ratings	C/C
Current number of performing banks	42
Current number of performing insurance companies	7
Actual deferrals and defaults as a % of total collateral	26.30%
Total performing collateral as a % of outstanding bonds	90.20%
PreTSL XXVII [Member]
Note 7 - Investment Securities (Details) - Pooled Trust Preferred Securities [Line Items]
Class	Mezzanine
Book value	301,000
Available-for-sale Securities	468,000
Unrealized gains (losses)	167,000
Total recognized OTTI credit loss	(438,000)
Moody's/Fitch ratings	C/C
Current number of performing banks	42
Current number of performing insurance companies	7
Actual deferrals and defaults as a % of total collateral	26.30%
Total performing collateral as a % of outstanding bonds	90.20%
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	2,462,000			2,069,000
Unrealized gains (losses)	(1,057,000)
Total recognized OTTI credit loss	$ (1,271,000)

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