Note 12 - Fair Value Measurements (Details) - Financial Assets and Liabilities Measured On a Non-recurring Basis - USD ($) $ in Thousands	3 Months Ended				9 Months Ended				12 Months Ended
	Sep. 30, 2015		Sep. 30, 2014		Sep. 30, 2015		Sep. 30, 2014		Dec. 31, 2014		Dec. 31, 2013
Assets
Assets Fair Value Disclosure Nonrecurring	$ 58,940				$ 58,940				$ 76,234
Asset Impairment Charges	835		$ 548		4,992		$ 1,158		4,596		$ 3,344
Impaired Loans [Member]
Assets
Assets Fair Value Disclosure Nonrecurring	41,173				41,173				49,554
Asset Impairment Charges	575		547		4,180		564		3,958		6,069
Other Real Estate Owned [Member]
Assets
Assets Fair Value Disclosure Nonrecurring	12,483	[1]			12,483	[1]			20,568	[2]
Asset Impairment Charges	179	[1]	(48)	[1]	404	[1]	277	[1]	202	[2]	(3,134)	[2]
Investments in Venture Capital [Member]
Assets
Assets Fair Value Disclosure Nonrecurring	5,284				5,284				5,495
Asset Impairment Charges	81		49		408		317		436		409
Equity Investments [Member]
Assets
Assets Fair Value Disclosure Nonrecurring									617
Commercial Portfolio Segment [Member] | Impaired Loans [Member]
Assets
Assets Fair Value Disclosure Nonrecurring	7,866				7,866				3,774
Asset Impairment Charges	575				3,380		17		17		5,731
Commercial Real Estate Portfolio Segment [Member] | Impaired Loans [Member]
Assets
Assets Fair Value Disclosure Nonrecurring	19,950				19,950				25,029
Asset Impairment Charges			515		654		515		3,914		125
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Impaired Loans [Member]
Assets
Assets Fair Value Disclosure Nonrecurring	$ 13,357				13,357				13,126
Asset Impairment Charges			$ 32		$ 146		$ 32		27		$ 213
Construction - Other Loans [Member] | Impaired Loans [Member]
Assets
Assets Fair Value Disclosure Nonrecurring									7,625
Fair Value, Inputs, Level 1 [Member]
Assets
Assets Fair Value Disclosure Nonrecurring									$ 617
Fair Value, Inputs, Level 1 [Member] | Other Real Estate Owned [Member]
Assets
Assets Fair Value Disclosure Nonrecurring		[1]				[1]				[2]
Fair Value, Inputs, Level 1 [Member] | Equity Investments [Member]
Assets
Assets Fair Value Disclosure Nonrecurring									$ 617
Fair Value, Inputs, Level 2 [Member]
Assets
Assets Fair Value Disclosure Nonrecurring	$ 8,247				$ 8,247				16,458
Fair Value, Inputs, Level 2 [Member] | Other Real Estate Owned [Member]
Assets
Assets Fair Value Disclosure Nonrecurring	8,247	[1]			8,247	[1]			16,458	[2]
Fair Value, Inputs, Level 3 [Member]
Assets
Assets Fair Value Disclosure Nonrecurring	50,693				50,693				59,159
Fair Value, Inputs, Level 3 [Member] | Impaired Loans [Member]
Assets
Assets Fair Value Disclosure Nonrecurring	41,173				41,173				49,554
Fair Value, Inputs, Level 3 [Member] | Other Real Estate Owned [Member]
Assets
Assets Fair Value Disclosure Nonrecurring	4,236	[1]			4,236	[1]			4,110	[2]
Fair Value, Inputs, Level 3 [Member] | Investments in Venture Capital [Member]
Assets
Assets Fair Value Disclosure Nonrecurring	5,284				5,284				5,495
Fair Value, Inputs, Level 3 [Member] | Commercial Portfolio Segment [Member] | Impaired Loans [Member]
Assets
Assets Fair Value Disclosure Nonrecurring	7,866				7,866				3,774
Fair Value, Inputs, Level 3 [Member] | Commercial Real Estate Portfolio Segment [Member] | Impaired Loans [Member]
Assets
Assets Fair Value Disclosure Nonrecurring	19,950				19,950				25,029
Fair Value, Inputs, Level 3 [Member] | Residential Mortgage and Equity Lines Portfolio Segment [Member] | Impaired Loans [Member]
Assets
Assets Fair Value Disclosure Nonrecurring	$ 13,357				$ 13,357				13,126
Fair Value, Inputs, Level 3 [Member] | Construction - Other Loans [Member] | Impaired Loans [Member]
Assets
Assets Fair Value Disclosure Nonrecurring									$ 7,625

[1] Other real estate owned balance of $26.3 million in the condensed consolidated balance sheet is net of estimated disposal costs.

[2] Other real estate owned balance of $31.5 million in the consolidated balance sheet is net of estimated disposal costs.