Note 16 - Fair Value Measurements (Details) - Financial Assets and Liabilities Measured On a Non-recurring Basis - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015		Dec. 31, 2014		Dec. 31, 2013
Assets
Fair value measurement	$ 58,889		$ 76,234
Total losses/gains	2,507		4,596		$ 3,344
Impaired Loans [Member]
Assets
Fair value measurement	39,685		49,554
Total losses/gains	1,550		3,958		6,069
Other Real Estate Owned [Member]
Assets
Fair value measurement	14,282	[1]	20,568	[2]
Total losses/gains	404	[1]	202	[1],[2]	(3,134)	[2]
Investments in Venture Capital [Member]
Assets
Fair value measurement	4,922		5,495
Total losses/gains	553		436		409
Equity Investments [Member]
Assets
Fair value measurement			617
Commercial Portfolio Segment [Member] | Impaired Loans [Member]
Assets
Fair value measurement	6,317		3,774
Total losses/gains	806		17		5,731
Commercial Real Estate Portfolio Segment [Member] | Impaired Loans [Member]
Assets
Fair value measurement	20,359		25,029
Total losses/gains	598		3,914		125
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Impaired Loans [Member]
Assets
Fair value measurement	13,009		13,126
Total losses/gains	$ 146		27		$ 213
Construction Residential [Member] | Impaired Loans [Member]
Assets
Fair value measurement			$ 7,625
Fair Value, Inputs, Level 1 [Member] | Other Real Estate Owned [Member]
Assets
Fair value measurement		[1]		[2]
Fair Value, Inputs, Level 2 [Member]
Assets
Fair value measurement	$ 10,047		$ 16,458
Fair Value, Inputs, Level 2 [Member] | Other Real Estate Owned [Member]
Assets
Fair value measurement	10,047	[1]	16,458	[2]
Fair Value, Inputs, Level 3 [Member]
Assets
Fair value measurement	48,842		59,776
Fair Value, Inputs, Level 3 [Member] | Impaired Loans [Member]
Assets
Fair value measurement	39,685		49,554
Fair Value, Inputs, Level 3 [Member] | Other Real Estate Owned [Member]
Assets
Fair value measurement	4,235	[1]	4,110	[2]
Fair Value, Inputs, Level 3 [Member] | Investments in Venture Capital [Member]
Assets
Fair value measurement	4,922		5,495
Fair Value, Inputs, Level 3 [Member] | Equity Investments [Member]
Assets
Fair value measurement			617
Fair Value, Inputs, Level 3 [Member] | Commercial Portfolio Segment [Member] | Impaired Loans [Member]
Assets
Fair value measurement	6,317		3,774
Fair Value, Inputs, Level 3 [Member] | Commercial Real Estate Portfolio Segment [Member] | Impaired Loans [Member]
Assets
Fair value measurement	20,359		25,029
Fair Value, Inputs, Level 3 [Member] | Residential Mortgage and Equity Lines Portfolio Segment [Member] | Impaired Loans [Member]
Assets
Fair value measurement	$ 13,009		13,126
Fair Value, Inputs, Level 3 [Member] | Construction Residential [Member] | Impaired Loans [Member]
Assets
Fair value measurement			$ 7,625

[1] Other real estate owned balance of $24.7. million in the Consolidated Balance Sheets is net of estimated disposal costs.

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