Note 16 - Fair Value Measurements (Details) - Financial Assets and Liabilities Measured On a Non-recurring Basis (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Impaired loans by type:
Fair Value Measurement	$ 76,234		$ 116,001
Total losses/Gains	4,596		3,344		12,666
Commercial Loans [Member] | Fair Value, Inputs, Level 3 [Member]
Impaired loans by type:
Fair Value Measurement	3,774		7,584
Commercial Loans [Member]
Impaired loans by type:
Fair Value Measurement	3,774		7,584
Total losses/Gains	17		5,731
Commercial Mortgage Loans [Member] | Fair Value, Inputs, Level 3 [Member]
Impaired loans by type:
Fair Value Measurement	25,029		29,001
Commercial Mortgage Loans [Member]
Impaired loans by type:
Fair Value Measurement	25,029		29,001
Total losses/Gains	3,914		125		440
Construction Residential [Member] | Fair Value, Inputs, Level 3 [Member]
Impaired loans by type:
Fair Value Measurement			500
Construction Residential [Member]
Impaired loans by type:
Fair Value Measurement			500
Construction - Other Loans [Member] | Fair Value, Inputs, Level 3 [Member]
Impaired loans by type:
Fair Value Measurement	7,625		15,363
Construction - Other Loans [Member]
Impaired loans by type:
Fair Value Measurement	7,625		15,363
Total losses/Gains					65
Residential Mortgage And Equity Lines Member | Fair Value, Inputs, Level 3 [Member]
Impaired loans by type:
Fair Value Measurement	13,126		14,236
Residential Mortgage And Equity Lines Member
Impaired loans by type:
Fair Value Measurement	13,126		14,236
Total losses/Gains	27		213		605
Land Loans [Member] | Fair Value, Inputs, Level 3 [Member]
Impaired loans by type:
Fair Value Measurement			29
Land Loans [Member]
Impaired loans by type:
Fair Value Measurement			29
Total losses/Gains					162
Fair Value, Inputs, Level 1 [Member] | Other Real Estate Owned [Member]
Impaired loans by type:
Fair Value Measurement		[1],[2]		[1],[2]
Fair Value, Inputs, Level 1 [Member] | Equity Investments [Member]
Impaired loans by type:
Fair Value Measurement			642
Fair Value, Inputs, Level 1 [Member]
Impaired loans by type:
Fair Value Measurement			642
Fair Value, Inputs, Level 2 [Member] | Other Real Estate Owned [Member]
Impaired loans by type:
Fair Value Measurement	16,458	[1],[2]	13,248	[1],[2]
Fair Value, Inputs, Level 2 [Member]
Impaired loans by type:
Fair Value Measurement	16,458		13,248
Fair Value, Inputs, Level 3 [Member] | Impaired Loans [Member]
Impaired loans by type:
Fair Value Measurement	49,554		66,713
Fair Value, Inputs, Level 3 [Member] | Other Real Estate Owned [Member]
Impaired loans by type:
Fair Value Measurement	4,110	[1],[2]	26,498	[1],[2]
Fair Value, Inputs, Level 3 [Member] | Investments in Venture Capital [Member]
Impaired loans by type:
Fair Value Measurement	5,495		8,900
Fair Value, Inputs, Level 3 [Member] | Equity Investments [Member]
Impaired loans by type:
Fair Value Measurement	617
Fair Value, Inputs, Level 3 [Member]
Impaired loans by type:
Fair Value Measurement	59,776		102,111
Impaired Loans [Member]
Impaired loans by type:
Fair Value Measurement	49,554		66,713
Total losses/Gains	3,958		6,069		1,272
Other Real Estate Owned [Member]
Impaired loans by type:
Fair Value Measurement	20,568	[1],[2]	39,746	[1],[2]
Total losses/Gains	202	[1],[2]	(3,134)	[1],[2]	10,904	[1],[2]
Investments in Venture Capital [Member]
Impaired loans by type:
Fair Value Measurement	5,495		8,900
Total losses/Gains	436		409		309
Equity Investments [Member]
Impaired loans by type:
Fair Value Measurement	617		642
Total losses/Gains					$ 181

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

[2] Other real estate owned balance of $53.0 million in the Consolidated Balance Sheets is net of estimated disposal costs.