Note 16 - Fair Value Measurements (Detail) - Financial Asset and Liabilities Measured on a Non-Recurring Basis (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011
Commercial Loans Member | Current Period [Member] | Impaired Loans [Member]
Total Losses for the Year	$ 0		$ 877
Commercial Loans Member | Prior Year [Member] | Impaired Loans [Member]
Total Losses for the Year	877		3,411
Commercial Loans Member | Impaired Loans [Member] | Fair Value, Inputs, Level 1 [Member]
Assets Measured at Fair Value on a Nonrecurring Basis	0		0
Commercial Loans Member | Impaired Loans [Member] | Fair Value, Inputs, Level 2 [Member]
Assets Measured at Fair Value on a Nonrecurring Basis	0		0
Commercial Loans Member | Impaired Loans [Member] | Fair Value, Inputs, Level 3 [Member]
Assets Measured at Fair Value on a Nonrecurring Basis	3,492		4,251
Commercial Loans Member | Impaired Loans [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Assets Measured at Fair Value on a Nonrecurring Basis	3,492		4,251
Commercial Mortgage Loans [Member] | Current Period [Member] | Impaired Loans [Member]
Total Losses for the Year	440
Commercial Mortgage Loans [Member] | Prior Year [Member] | Impaired Loans [Member]
Total Losses for the Year	0
Commercial Mortgage Loans [Member] | Impaired Loans [Member] | Fair Value, Inputs, Level 1 [Member]
Assets Measured at Fair Value on a Nonrecurring Basis	0
Commercial Mortgage Loans [Member] | Impaired Loans [Member] | Fair Value, Inputs, Level 2 [Member]
Assets Measured at Fair Value on a Nonrecurring Basis	0
Commercial Mortgage Loans [Member] | Impaired Loans [Member] | Fair Value, Inputs, Level 3 [Member]
Assets Measured at Fair Value on a Nonrecurring Basis	11,295
Commercial Mortgage Loans [Member] | Impaired Loans [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Assets Measured at Fair Value on a Nonrecurring Basis	11,295
Construction Residential Member | Current Period [Member] | Impaired Loans [Member]
Total Losses for the Year	0		0
Construction Residential Member | Prior Year [Member] | Impaired Loans [Member]
Total Losses for the Year	0		1,295
Construction Residential Member | Impaired Loans [Member] | Fair Value, Inputs, Level 1 [Member]
Assets Measured at Fair Value on a Nonrecurring Basis	0		0
Construction Residential Member | Impaired Loans [Member] | Fair Value, Inputs, Level 2 [Member]
Assets Measured at Fair Value on a Nonrecurring Basis	0		0
Construction Residential Member | Impaired Loans [Member] | Fair Value, Inputs, Level 3 [Member]
Assets Measured at Fair Value on a Nonrecurring Basis	500		0
Construction Residential Member | Impaired Loans [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Assets Measured at Fair Value on a Nonrecurring Basis	500		0
Construction - Other Loans [Member] | Current Period [Member] | Impaired Loans [Member]
Total Losses for the Year	65
Construction - Other Loans [Member] | Prior Year [Member] | Impaired Loans [Member]
Total Losses for the Year	0
Construction - Other Loans [Member] | Impaired Loans [Member] | Fair Value, Inputs, Level 1 [Member]
Assets Measured at Fair Value on a Nonrecurring Basis	0
Construction - Other Loans [Member] | Impaired Loans [Member] | Fair Value, Inputs, Level 2 [Member]
Assets Measured at Fair Value on a Nonrecurring Basis	0
Construction - Other Loans [Member] | Impaired Loans [Member] | Fair Value, Inputs, Level 3 [Member]
Assets Measured at Fair Value on a Nonrecurring Basis	46,153
Construction - Other Loans [Member] | Impaired Loans [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Assets Measured at Fair Value on a Nonrecurring Basis	46,153
Residential Mortgage And Equity Lines Member | Current Period [Member] | Impaired Loans [Member]
Total Losses for the Year	605
Residential Mortgage And Equity Lines Member | Prior Year [Member] | Impaired Loans [Member]
Total Losses for the Year	820
Residential Mortgage And Equity Lines Member | Impaired Loans [Member] | Fair Value, Inputs, Level 1 [Member]
Assets Measured at Fair Value on a Nonrecurring Basis	0
Residential Mortgage And Equity Lines Member | Impaired Loans [Member] | Fair Value, Inputs, Level 2 [Member]
Assets Measured at Fair Value on a Nonrecurring Basis	0
Residential Mortgage And Equity Lines Member | Impaired Loans [Member] | Fair Value, Inputs, Level 3 [Member]
Assets Measured at Fair Value on a Nonrecurring Basis	11,206
Residential Mortgage And Equity Lines Member | Impaired Loans [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Assets Measured at Fair Value on a Nonrecurring Basis	11,206
Land Loans Member | Current Period [Member] | Impaired Loans [Member]
Total Losses for the Year	162		46
Land Loans Member | Prior Year [Member] | Impaired Loans [Member]
Total Losses for the Year	46		1,003
Land Loans Member | Impaired Loans [Member] | Fair Value, Inputs, Level 1 [Member]
Assets Measured at Fair Value on a Nonrecurring Basis	0		0
Land Loans Member | Impaired Loans [Member] | Fair Value, Inputs, Level 2 [Member]
Assets Measured at Fair Value on a Nonrecurring Basis	0		0
Land Loans Member | Impaired Loans [Member] | Fair Value, Inputs, Level 3 [Member]
Assets Measured at Fair Value on a Nonrecurring Basis	297		611
Land Loans Member | Impaired Loans [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Assets Measured at Fair Value on a Nonrecurring Basis	297		611
Real Estate Loans [Member] | Current Period [Member] | Impaired Loans [Member]
Total Losses for the Year			820
Real Estate Loans [Member] | Prior Year [Member] | Impaired Loans [Member]
Total Losses for the Year			1,407
Real Estate Loans [Member] | Impaired Loans [Member] | Fair Value, Inputs, Level 1 [Member]
Assets Measured at Fair Value on a Nonrecurring Basis			0
Real Estate Loans [Member] | Impaired Loans [Member] | Fair Value, Inputs, Level 2 [Member]
Assets Measured at Fair Value on a Nonrecurring Basis			0
Real Estate Loans [Member] | Impaired Loans [Member] | Fair Value, Inputs, Level 3 [Member]
Assets Measured at Fair Value on a Nonrecurring Basis			35,576
Real Estate Loans [Member] | Impaired Loans [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Assets Measured at Fair Value on a Nonrecurring Basis			35,576
Current Period [Member] | Impaired Loans [Member]
Total Losses for the Year	1,272		1,743
Current Period [Member] | Other Real Estate Owned [Member]
Total Losses for the Year	10,904	[1]	7,003	[2]
Current Period [Member] | Investments in Venture Capital [Member]
Total Losses for the Year	309		379
Current Period [Member] | Equity Investments [Member]
Total Losses for the Year	181		200
Current Period [Member] | Loans Held-for-Sale [Member]
Total Losses for the Year			0
Current Period [Member]
Total Losses for the Year	12,666		9,325
Prior Year [Member] | Impaired Loans [Member]
Total Losses for the Year	1,743		7,116
Prior Year [Member] | Other Real Estate Owned [Member]
Total Losses for the Year	7,003	[1]	20,139	[2]
Prior Year [Member] | Investments in Venture Capital [Member]
Total Losses for the Year	379		760
Prior Year [Member] | Equity Investments [Member]
Total Losses for the Year	200		304
Prior Year [Member] | Loans Held-for-Sale [Member]
Total Losses for the Year			3,160
Prior Year [Member]
Total Losses for the Year	9,325		31,479
Impaired Loans [Member] | Fair Value, Inputs, Level 1 [Member]
Assets Measured at Fair Value on a Nonrecurring Basis	0		0
Impaired Loans [Member] | Fair Value, Inputs, Level 2 [Member]
Assets Measured at Fair Value on a Nonrecurring Basis	0		0
Impaired Loans [Member] | Fair Value, Inputs, Level 3 [Member]
Assets Measured at Fair Value on a Nonrecurring Basis	72,943		40,438
Impaired Loans [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Assets Measured at Fair Value on a Nonrecurring Basis	72,943		40,438
Other Real Estate Owned [Member] | Fair Value, Inputs, Level 1 [Member]
Assets Measured at Fair Value on a Nonrecurring Basis	0	[1]	0	[2]
Other Real Estate Owned [Member] | Fair Value, Inputs, Level 2 [Member]
Assets Measured at Fair Value on a Nonrecurring Basis	27,149	[1]	79,029	[2]
Other Real Estate Owned [Member] | Fair Value, Inputs, Level 3 [Member]
Assets Measured at Fair Value on a Nonrecurring Basis	4,841	[1]	1,093	[2]
Other Real Estate Owned [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Assets Measured at Fair Value on a Nonrecurring Basis	31,990	[1]	80,122	[2]
Investments in Venture Capital [Member] | Fair Value, Inputs, Level 1 [Member]
Assets Measured at Fair Value on a Nonrecurring Basis	0		0
Investments in Venture Capital [Member] | Fair Value, Inputs, Level 2 [Member]
Assets Measured at Fair Value on a Nonrecurring Basis	0		0
Investments in Venture Capital [Member] | Fair Value, Inputs, Level 3 [Member]
Assets Measured at Fair Value on a Nonrecurring Basis	9,001		8,693
Investments in Venture Capital [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Assets Measured at Fair Value on a Nonrecurring Basis	9,001		8,693
Equity Investments [Member] | Fair Value, Inputs, Level 1 [Member]
Assets Measured at Fair Value on a Nonrecurring Basis	142		323
Equity Investments [Member] | Fair Value, Inputs, Level 2 [Member]
Assets Measured at Fair Value on a Nonrecurring Basis	0		0
Equity Investments [Member] | Fair Value, Inputs, Level 3 [Member]
Assets Measured at Fair Value on a Nonrecurring Basis	0		0
Equity Investments [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Assets Measured at Fair Value on a Nonrecurring Basis	142		323
Loans Held-for-Sale [Member] | Fair Value, Inputs, Level 1 [Member]
Assets Measured at Fair Value on a Nonrecurring Basis			0
Loans Held-for-Sale [Member] | Fair Value, Inputs, Level 2 [Member]
Assets Measured at Fair Value on a Nonrecurring Basis			0
Loans Held-for-Sale [Member] | Fair Value, Inputs, Level 3 [Member]
Assets Measured at Fair Value on a Nonrecurring Basis			760
Loans Held-for-Sale [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Assets Measured at Fair Value on a Nonrecurring Basis			760
Fair Value, Inputs, Level 1 [Member]
Assets Measured at Fair Value on a Nonrecurring Basis	142		323
Fair Value, Inputs, Level 2 [Member]
Assets Measured at Fair Value on a Nonrecurring Basis	27,149		79,029
Fair Value, Inputs, Level 3 [Member]
Assets Measured at Fair Value on a Nonrecurring Basis	86,785		50,984
Estimate of Fair Value, Fair Value Disclosure [Member]
Assets Measured at Fair Value on a Nonrecurring Basis	$ 114,076		$ 130,336

[1] Other real estate owned balance of $46.4 million in the consolidated balance sheet is net of estimated disposal costs.

[2] Other real estate owned balance of $71.0 million in the consolidated balance sheet is net of estimated disposal costs.