Note 5 - Investment Securities (Details) - Trust Preferred Securities $ in Thousands	6 Months Ended
	Jun. 30, 2015 USD ($)	Dec. 31, 2014 USD ($)	Jun. 30, 2014 USD ($)	Dec. 31, 2013 USD ($)
Note 5 - Investment Securities (Details) - Trust Preferred Securities [Line Items]
Amortized cost	$ 177,227	$ 185,250
Fair value	176,142	185,379
Unrealized losses	(3,182)	(2,271)
Cumulative OTTI life to date	$ 1,400	3,966	$ 3,966	$ 3,959
TPREF Funding II [Member]
Note 5 - Investment Securities (Details) - Trust Preferred Securities [Line Items]
Class / tranche	Class B Notes
Amortized cost	$ 732
Fair value	401
Unrealized losses	$ (331)
Lowest credit rating assigned	C
Number of banks currently performing	20
Deferrals / defaults as % of current balance	36.00%
Conditional default rates for 2013 and beyond	0.39%
Cumulative OTTI life to date	$ 267
TPREF Funding III [Member]
Note 5 - Investment Securities (Details) - Trust Preferred Securities [Line Items]
Class / tranche	Class B2 Notes
Amortized cost	$ 1,518
Fair value	799
Unrealized losses	$ (719)
Lowest credit rating assigned	C
Number of banks currently performing	15
Deferrals / defaults as % of current balance	36.00%
Conditional default rates for 2013 and beyond	0.33%
Cumulative OTTI life to date	$ 483
Trapeza CDO I, LLC [Member]
Note 5 - Investment Securities (Details) - Trust Preferred Securities [Line Items]
Class / tranche	Class C1 Notes
Amortized cost	$ 556
Fair value	342
Unrealized losses	$ (214)
Lowest credit rating assigned	C
Number of banks currently performing	7
Deferrals / defaults as % of current balance	50.00%
Conditional default rates for 2013 and beyond	0.35%
Cumulative OTTI life to date	$ 470
ALESCO Preferred Funding V [Member]
Note 5 - Investment Securities (Details) - Trust Preferred Securities [Line Items]
Class / tranche	Class C1 Notes
Amortized cost	$ 820
Fair value	464
Unrealized losses	$ (356)
Lowest credit rating assigned	C
Number of banks currently performing	40
Deferrals / defaults as % of current balance	15.00%
Conditional default rates for 2013 and beyond	0.35%
Cumulative OTTI life to date	$ 180
Collateralized Debt Obligations [Member]
Note 5 - Investment Securities (Details) - Trust Preferred Securities [Line Items]
Amortized cost	3,626	5,261
Fair value	2,006	3,193
Unrealized losses	$ (1,620)	$ (2,068)
Number of banks currently performing	82
Deferrals / defaults as % of current balance	32.00%
Cumulative OTTI life to date	$ 1,400