Note 11 - Fair Value Measurements (Details) - Financial Assets and Liabilities Measured On a Non-recurring Basis (USD $) In Thousands, unless otherwise specified	3 Months Ended				12 Months Ended
	Mar. 31, 2015		Mar. 31, 2014		Dec. 31, 2014		Dec. 31, 2013
Impaired loans by type:
Assets Fair Value Disclosure Nonrecurring	$ 66,363				$ 76,234
Asset Impairment Charges	609		294		4,596		3,344
Commercial Loans [Member] | Fair Value, Inputs, Level 3 [Member]
Impaired loans by type:
Assets Fair Value Disclosure Nonrecurring	11,749				3,774
Commercial Loans [Member]
Impaired loans by type:
Assets Fair Value Disclosure Nonrecurring	11,749				3,774
Asset Impairment Charges					17		5,731
Commercial Mortgage Loans [Member] | Fair Value, Inputs, Level 3 [Member]
Impaired loans by type:
Assets Fair Value Disclosure Nonrecurring	19,947				25,029
Commercial Mortgage Loans [Member]
Impaired loans by type:
Assets Fair Value Disclosure Nonrecurring	19,947				25,029
Asset Impairment Charges	56				3,914		125
Residential Mortgage and Equity Lines [Member] | Fair Value, Inputs, Level 3 [Member]
Impaired loans by type:
Assets Fair Value Disclosure Nonrecurring	14,318				13,126
Residential Mortgage and Equity Lines [Member]
Impaired loans by type:
Assets Fair Value Disclosure Nonrecurring	14,318				13,126
Asset Impairment Charges	148				27		213
Impaired Loans [Member] | Fair Value, Inputs, Level 3 [Member]
Impaired loans by type:
Assets Fair Value Disclosure Nonrecurring	46,014				49,554
Impaired Loans [Member]
Impaired loans by type:
Assets Fair Value Disclosure Nonrecurring	46,014				49,554
Asset Impairment Charges	204				3,958		6,069
Other Real Estate Owned [Member] | Fair Value, Inputs, Level 1 [Member]
Impaired loans by type:
Assets Fair Value Disclosure Nonrecurring		[1]				[2]
Other Real Estate Owned [Member] | Fair Value, Inputs, Level 2 [Member]
Impaired loans by type:
Assets Fair Value Disclosure Nonrecurring	10,868	[1]			16,458	[2]
Other Real Estate Owned [Member] | Fair Value, Inputs, Level 3 [Member]
Impaired loans by type:
Assets Fair Value Disclosure Nonrecurring	4,110	[1]			4,110	[2]
Other Real Estate Owned [Member]
Impaired loans by type:
Assets Fair Value Disclosure Nonrecurring	14,978	[1]			20,568	[2]
Asset Impairment Charges	181	[1]	183	[1]	202	[2]	(3,134)	[2]
Investments in Venture Capital [Member] | Fair Value, Inputs, Level 3 [Member]
Impaired loans by type:
Assets Fair Value Disclosure Nonrecurring	5,371				5,495
Investments in Venture Capital [Member]
Impaired loans by type:
Assets Fair Value Disclosure Nonrecurring	5,371				5,495
Asset Impairment Charges	224		111		436		409
Construction - Other Loans [Member] | Fair Value, Inputs, Level 3 [Member]
Impaired loans by type:
Assets Fair Value Disclosure Nonrecurring					7,625
Construction - Other Loans [Member]
Impaired loans by type:
Assets Fair Value Disclosure Nonrecurring					7,625
Equity Investments [Member] | Fair Value, Inputs, Level 3 [Member]
Impaired loans by type:
Assets Fair Value Disclosure Nonrecurring					617
Equity Investments [Member]
Impaired loans by type:
Assets Fair Value Disclosure Nonrecurring					617
Fair Value, Inputs, Level 2 [Member]
Impaired loans by type:
Assets Fair Value Disclosure Nonrecurring	10,868				16,458
Fair Value, Inputs, Level 3 [Member]
Impaired loans by type:
Assets Fair Value Disclosure Nonrecurring	$ 55,495				$ 59,776

[1] Other real estate owned balance of $30.8 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.