Note 7 - Investment Securities (Details) - Pooled Trust Preferred Securities (USD $)	9 Months Ended
	Sep. 30, 2013		Dec. 31, 2012
Note 7 - Investment Securities (Details) - Pooled Trust Preferred Securities [Line Items]
Book value	$ 410,244,000		$ 394,750,000
Fair value	407,248,000		401,502,000
Total recognized OTTI credit loss	(43,000)
Pretsl Iv [Member]
Note 7 - Investment Securities (Details) - Pooled Trust Preferred Securities [Line Items]
Class	Mezzanine*	[1]
Book value	243,000
Fair value	206,000
Unrealized gains (losses)	(37,000)
Total recognized OTTI credit loss	(1,000)
Moody's/Fitch ratings	Caa2/B
Current number of performing banks	5
Current number of performing insurance companies	-
Actual deferrals and defaults as a % of total collateral	18.00%
Total performing collateral as a % of outstanding bonds	139.60%
Pretsl V [Member]
Note 7 - Investment Securities (Details) - Pooled Trust Preferred Securities [Line Items]
Class	Mezzanine*	[1]
Total recognized OTTI credit loss	(118,000)
Moody's/Fitch ratings	C/D
Current number of performing banks	-
Current number of performing insurance companies	-
Actual deferrals and defaults as a % of total collateral	100.00%
Total performing collateral as a % of outstanding bonds	12.70%
Pretsl Xvii [Member]
Note 7 - Investment Securities (Details) - Pooled Trust Preferred Securities [Line Items]
Class	Mezzanine
Book value	752,000
Fair value	453,000
Unrealized gains (losses)	(299,000)
Total recognized OTTI credit loss	(222,000)
Moody's/Fitch ratings	C/C
Current number of performing banks	31
Current number of performing insurance companies	5
Actual deferrals and defaults as a % of total collateral	33.30%
Total performing collateral as a % of outstanding bonds	78.40%
Pretsl Xix [Member]
Note 7 - Investment Securities (Details) - Pooled Trust Preferred Securities [Line Items]
Class	Mezzanine
Book value	988,000
Fair value	442,000
Unrealized gains (losses)	(546,000)
Total recognized OTTI credit loss	0
Moody's/Fitch ratings	C/C
Current number of performing banks	36
Current number of performing insurance companies	13
Actual deferrals and defaults as a % of total collateral	22.60%
Total performing collateral as a % of outstanding bonds	82.50%
Pretsl Xxv [Member]
Note 7 - Investment Securities (Details) - Pooled Trust Preferred Securities [Line Items]
Class	Mezzanine
Book value	766,000
Fair value	380,000
Unrealized gains (losses)	(386,000)
Total recognized OTTI credit loss	(222,000)
Moody's/Fitch ratings	C/C
Current number of performing banks	41
Current number of performing insurance companies	6
Actual deferrals and defaults as a % of total collateral	33.50%
Total performing collateral as a % of outstanding bonds	80.20%
Pretsl Xxvi [Member]
Note 7 - Investment Securities (Details) - Pooled Trust Preferred Securities [Line Items]
Class	Mezzanine
Book value	469,000
Fair value	291,000
Unrealized gains (losses)	(178,000)
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	30.20%
Total performing collateral as a % of outstanding bonds	83.70%
PreTSL XXVII [Member]
Note 7 - Investment Securities (Details) - Pooled Trust Preferred Securities [Line Items]
Class	Mezzanine
Book value	301,000
Fair value	397,000
Unrealized gains (losses)	96,000
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	30.20%
Total performing collateral as a % of outstanding bonds	83.70%
Pooled Trust Preferred Securities [Member]
Note 7 - Investment Securities (Details) - Pooled Trust Preferred Securities [Line Items]
Book value	3,519,000		3,519,000
Fair value	2,169,000		1,962,000
Unrealized gains (losses)	(1,350,000)
Total recognized OTTI credit loss	$ (1,271,000)

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