Note 11 - Fair Value Measurements (Detail) - Financial Asset and Liabilities Measured on a Non-Recurring Basis (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended				12 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2012		Sep. 30, 2011		Dec. 31, 2011		Dec. 31, 2010
Impaired loans by type:
Total Losses	$ 2,234		$ 73		$ 3,931		$ 2,473				$ 3,160
Other real estate owned (1)	2,875	[1]	4,125	[1]	10,602	[1]	6,505	[1]	7,003	[2]	20,139	[2]
Investments in venture capital	39		50		226		337		379		760
Equity investments			199		43		199		200		304
Total assets	5,148		4,447		14,802		9,514		9,325		31,479
Commercial Loans Member | Fair Value, Inputs, Level 3 [Member]
Impaired loans by type:
Fair Value	7,699				7,699				4,251
Commercial Loans Member | Estimate of Fair Value, Fair Value Disclosure [Member]
Impaired loans by type:
Fair Value	7,699				7,699				4,251
Commercial Loans Member
Impaired loans by type:
Total Losses	1,983				2,848		1,868		877		3,411
Construction Residential Member | Fair Value, Inputs, Level 3 [Member]
Impaired loans by type:
Fair Value	500				500
Construction Residential Member | Estimate of Fair Value, Fair Value Disclosure [Member]
Impaired loans by type:
Fair Value	500				500
Construction Residential Member
Impaired loans by type:
Total Losses											1,295
Real Estate Loans [Member] | Fair Value, Inputs, Level 3 [Member]
Impaired loans by type:
Fair Value	10,087				10,087				35,576
Real Estate Loans [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Impaired loans by type:
Fair Value	10,087				10,087				35,576
Real Estate Loans [Member]
Impaired loans by type:
Total Losses					301		532		820		1,407
Land Loans Member | Fair Value, Inputs, Level 3 [Member]
Impaired loans by type:
Fair Value	1,154				1,154				611
Land Loans Member | Estimate of Fair Value, Fair Value Disclosure [Member]
Impaired loans by type:
Fair Value	1,154				1,154				611
Land Loans Member
Impaired loans by type:
Total Losses									46		1,003
Residential Mortgage Loans [Member] | Fair Value, Inputs, Level 3 [Member]
Impaired loans by type:
Fair Value	12,109				12,109				40,438
Residential Mortgage Loans [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Impaired loans by type:
Fair Value	12,109				12,109				40,438
Residential Mortgage Loans [Member]
Impaired loans by type:
Total Losses	251		73		782		73		1,743		7,116
Fair Value, Inputs, Level 1 [Member]
Impaired loans by type:
Other real estate owned (1)		[1]				[1]				[2]
Equity investments	280				280				323
Total assets	280				280				323
Fair Value, Inputs, Level 2 [Member]
Impaired loans by type:
Other real estate owned (1)	36,833	[1]			36,833	[1]			79,029	[2]
Total assets	36,833				36,833				79,029
Fair Value, Inputs, Level 3 [Member]
Impaired loans by type:
Fair Value	31,549				31,549				760
Other real estate owned (1)	7,487	[1]			7,487	[1]			1,093	[2]
Investments in venture capital	9,118				9,118				8,693
Total assets	48,154				48,154				50,984
Estimate of Fair Value, Fair Value Disclosure [Member]
Impaired loans by type:
Fair Value	31,549				31,549				760
Other real estate owned (1)	44,320	[1]			44,320	[1]			80,122	[2]
Investments in venture capital	9,118				9,118				8,693
Equity investments	280				280				323
Total assets	$ 85,267				$ 85,267				$ 130,336

[1] Other real estate owned balance of $60.6 million in the condensed consolidated balance sheets is net of estimated disposal costs.

[2] Other real estate owned balance of $92.7 million in the condensed consolidated balance sheets is net of estimated disposal costs.