Note 7 - Investment Securities (Details) - Pooled Trust Preferred Securities (USD $)	6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012	Dec. 31, 2012
Note 7 - Investment Securities (Details) - Pooled Trust Preferred Securities [Line Items]
Book value	$ 383,419,000			$ 394,750,000
Fair value	380,364,000			401,502,000
Total recognized OTTI credit loss	(43,000)		0
Pretsl Iv [Member]
Note 7 - Investment Securities (Details) - Pooled Trust Preferred Securities [Line Items]
Class	Mezzanine*	[1]
Book value	243,000
Fair value	201,000
Unrealized gains (losses)	(42,000)
Realized OTTI credit loss	0
Total recognized OTTI credit loss	(1,000)
Moody's/Fitch ratings	Caa2/CCC
Current number of performing banks	5
Current number of performing insurance companies	0
Actual deferrals and defaults as a % of total collateral	18.00%
Total performing collateral as a % of outstanding bonds	139.50%
Pretsl V [Member]
Note 7 - Investment Securities (Details) - Pooled Trust Preferred Securities [Line Items]
Class	Mezzanine*	[1]
Book value	0
Fair value	0
Unrealized gains (losses)	0
Realized OTTI credit loss	0
Total recognized OTTI credit loss	(118,000)
Moody's/Fitch ratings	C/D
Current number of performing banks	0
Current number of performing insurance companies	0
Actual deferrals and defaults as a % of total collateral	100.00%
Total performing collateral as a % of outstanding bonds	12.50%
Pretsl Xvii [Member]
Note 7 - Investment Securities (Details) - Pooled Trust Preferred Securities [Line Items]
Class	Mezzanine
Book value	752,000
Fair value	439,000
Unrealized gains (losses)	(313,000)
Realized OTTI credit loss	0
Total recognized OTTI credit loss	(222,000)
Moody's/Fitch ratings	C/C
Current number of performing banks	30
Current number of performing insurance companies	4
Actual deferrals and defaults as a % of total collateral	38.80%
Total performing collateral as a % of outstanding bonds	71.20%
Pretsl Xix [Member]
Note 7 - Investment Securities (Details) - Pooled Trust Preferred Securities [Line Items]
Class	Mezzanine
Book value	988,000
Fair value	431,000
Unrealized gains (losses)	(557,000)
Realized OTTI credit loss	0
Total recognized OTTI credit loss	0
Moody's/Fitch ratings	C/C
Current number of performing banks	35
Current number of performing insurance companies	13
Actual deferrals and defaults as a % of total collateral	22.90%
Total performing collateral as a % of outstanding bonds	81.80%
Pretsl Xxv [Member]
Note 7 - Investment Securities (Details) - Pooled Trust Preferred Securities [Line Items]
Class	Mezzanine
Book value	766,000
Fair value	356,000
Unrealized gains (losses)	(410,000)
Realized OTTI credit loss	0
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	79.80%
Pretsl Xxvi [Member]
Note 7 - Investment Securities (Details) - Pooled Trust Preferred Securities [Line Items]
Class	Mezzanine
Book value	469,000
Fair value	282,000
Unrealized gains (losses)	(187,000)
Realized OTTI credit loss	0
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	83.50%
PreTSL XXVII [Member]
Note 7 - Investment Securities (Details) - Pooled Trust Preferred Securities [Line Items]
Class	Mezzanine
Book value	301,000
Fair value	382,000
Unrealized gains (losses)	81,000
Realized OTTI credit loss	0
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	83.50%
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	2,091,000			1,962,000
Unrealized gains (losses)	(1,428,000)
Realized OTTI credit loss	0
Total recognized OTTI credit loss	$ (1,271,000)

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