Note 11 - Fair Value Measurements (Details) - Financial Assets and Liabilities Measured On a Non-recurring Basis - USD ($) $ in Thousands	3 Months Ended				6 Months Ended				12 Months Ended
	Jun. 30, 2015		Jun. 30, 2014		Jun. 30, 2015		Jun. 30, 2014		Dec. 31, 2014		Dec. 31, 2013
Assets
Assets Fair Value Disclosure Nonrecurring	$ 60,797				$ 60,797				$ 76,234
Asset Impairment Charges	2,721		$ 316		4,157		$ 610		4,596		$ 3,344
Impaired Loans [Member]
Assets
Assets Fair Value Disclosure Nonrecurring	43,173				43,173				49,554
Asset Impairment Charges	2,574		17		3,605		17		3,958		6,069
Other Real Estate Owned [Member]
Assets
Assets Fair Value Disclosure Nonrecurring	12,253	[1]			12,253	[1]			20,568	[2]
Asset Impairment Charges	44	[1]	142	[1]	225	[1]	325	[1]	202	[2]	(3,134)	[2]
Investments in Venture Capital [Member]
Assets
Assets Fair Value Disclosure Nonrecurring	5,371				5,371				5,495
Asset Impairment Charges	103		157		327		268		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	8,955				8,955				3,774
Asset Impairment Charges	2,574		$ 17		2,805		$ 17		17		5,731
Commercial Real Estate Portfolio Segment [Member] | Impaired Loans [Member]
Assets
Assets Fair Value Disclosure Nonrecurring	20,268				20,268				25,029
Asset Impairment Charges					654				3,914		125
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Impaired Loans [Member]
Assets
Assets Fair Value Disclosure Nonrecurring	$ 13,950				13,950				13,126
Asset Impairment Charges					$ 146				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
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	$ 8,017				$ 8,017				16,458
Fair Value, Inputs, Level 2 [Member] | Other Real Estate Owned [Member]
Assets
Assets Fair Value Disclosure Nonrecurring	8,017	[1]			8,017	[1]			16,458	[2]
Fair Value, Inputs, Level 3 [Member]
Assets
Assets Fair Value Disclosure Nonrecurring	52,780				52,780				59,159
Fair Value, Inputs, Level 3 [Member] | Impaired Loans [Member]
Assets
Assets Fair Value Disclosure Nonrecurring	43,173				43,173				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	5,371				5,371				5,495
Fair Value, Inputs, Level 3 [Member] | Commercial Portfolio Segment [Member] | Impaired Loans [Member]
Assets
Assets Fair Value Disclosure Nonrecurring	8,955				8,955				3,774
Fair Value, Inputs, Level 3 [Member] | Commercial Real Estate Portfolio Segment [Member] | Impaired Loans [Member]
Assets
Assets Fair Value Disclosure Nonrecurring	20,268				20,268				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	$ 13,950				$ 13,950				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 $23.8 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.