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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 | 12 Months Ended
--- | --- | ---
Mar. 31, 2013 | Dec. 31, 2012
Commercial Loans Member | Current Period [Member] | Impaired Loans [Member] |  |  |  |
Total Losses for the Year | $ 463 |  | $ 0 |
Commercial Loans Member | Prior Year [Member] | Impaired Loans [Member] |  |  |  |
Total Losses for the Year | 859 |  | 877 |
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 | 5,463 |  | 3,492 |
Commercial Loans Member | Impaired Loans [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] |  |  |  |
Assets Measured at Fair Value on a Nonrecurring Basis | 5,463 |  | 3,492 |
Commercial Mortgage Loans [Member] | Current Period [Member] | Impaired Loans [Member] |  |  |  |
Total Losses for the Year | 41 |  | 440 |
Commercial Mortgage Loans [Member] | Prior Year [Member] | Impaired Loans [Member] |  |  |  |
Total Losses for the Year | 0 |  | 0 |
Commercial Mortgage Loans [Member] | Impaired Loans [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Assets Measured at Fair Value on a Nonrecurring Basis | 0 |  | 0 |
Commercial Mortgage Loans [Member] | Impaired Loans [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Assets Measured at Fair Value on a Nonrecurring Basis | 0 |  | 0 |
Commercial Mortgage Loans [Member] | Impaired Loans [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Assets Measured at Fair Value on a Nonrecurring Basis | 23,736 |  | 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 | 23,736 |  | 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 |  | 0 |
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 |  | 500 |
Construction Residential Member | Impaired Loans [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] |  |  |  |
Assets Measured at Fair Value on a Nonrecurring Basis | 500 |  | 500 |
Construction - Other Loans [Member] | Current Period [Member] | Impaired Loans [Member] |  |  |  |
Total Losses for the Year | 0 |  | 65 |
Construction - Other Loans [Member] | Prior Year [Member] | Impaired Loans [Member] |  |  |  |
Total Losses for the Year | 0 |  | 0 |
Construction - Other Loans [Member] | Impaired Loans [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Assets Measured at Fair Value on a Nonrecurring Basis | 0 |  | 0 |
Construction - Other Loans [Member] | Impaired Loans [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Assets Measured at Fair Value on a Nonrecurring Basis | 0 |  | 0 |
Construction - Other Loans [Member] | Impaired Loans [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Assets Measured at Fair Value on a Nonrecurring Basis | 46,162 |  | 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 | 46,162 |  | 46,153 |
Real Estate Loans [Member] | Current Period [Member] | Impaired Loans [Member] |  |  |  |
Total Losses for the Year | 0 |  |  |
Real Estate Loans [Member] | Prior Year [Member] | Impaired Loans [Member] |  |  |  |
Total Losses for the Year | 1,357 |  |  |
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 | 0 |  |  |
Real Estate Loans [Member] | Impaired Loans [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] |  |  |  |
Assets Measured at Fair Value on a Nonrecurring Basis | 0 |  |  |
Residential Mortgage And Equity Lines Member | Current Period [Member] | Impaired Loans [Member] |  |  |  |
Total Losses for the Year | 189 |  | 605 |
Residential Mortgage And Equity Lines Member | Prior Year [Member] | Impaired Loans [Member] |  |  |  |
Total Losses for the Year | 526 |  | 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 |  | 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 |  | 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 | 13,299 |  | 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 | 13,299 |  | 11,206 |
Land Loans Member | Current Period [Member] | Impaired Loans [Member] |  |  |  |
Total Losses for the Year | 48 |  | 162 |
Land Loans Member | Prior Year [Member] | Impaired Loans [Member] |  |  |  |
Total Losses for the Year | 0 |  | 46 |
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 | 208 |  | 297 |
Land Loans Member | Impaired Loans [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] |  |  |  |
Assets Measured at Fair Value on a Nonrecurring Basis | 208 |  | 297 |
Current Period [Member] | Impaired Loans [Member] |  |  |  |
Total Losses for the Year | 741 |  | 1,272 |
Current Period [Member] | Other Real Estate Owned [Member] |  |  |  |
Total Losses for the Year | (66) | [1] | 10,904 | [2]
Current Period [Member] | Investments in Venture Capital [Member] |  |  |  |
Total Losses for the Year | 92 |  | 309 |
Current Period [Member] | Equity Investments [Member] |  |  |  |
Total Losses for the Year | 0 |  | 181 |
Current Period [Member] |  |  |  |
Total Losses for the Year | 767 |  | 12,666 |
Prior Year [Member] | Impaired Loans [Member] |  |  |  |
Total Losses for the Year | 2,742 |  | 1,743 |
Prior Year [Member] | Other Real Estate Owned [Member] |  |  |  |
Total Losses for the Year | 2,824 | [1] | 7,003 | [2]
Prior Year [Member] | Investments in Venture Capital [Member] |  |  |  |
Total Losses for the Year | 137 |  | 379 |
Prior Year [Member] | Equity Investments [Member] |  |  |  |
Total Losses for the Year | 0 |  | 200 |
Prior Year [Member] |  |  |  |
Total Losses for the Year | 5,703 |  | 9,325 |
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 | 89,368 |  | 72,943 |
Impaired Loans [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] |  |  |  |
Assets Measured at Fair Value on a Nonrecurring Basis | 89,368 |  | 72,943 |
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 | 24,892 | [1] | 27,149 | [2]
Other Real Estate Owned [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Assets Measured at Fair Value on a Nonrecurring Basis | 4,515 | [1] | 4,841 | [2]
Other Real Estate Owned [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] |  |  |  |
Assets Measured at Fair Value on a Nonrecurring Basis | 29,407 | [1] | 31,990 | [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 | 9,026 |  | 9,001 |
Investments in Venture Capital [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] |  |  |  |
Assets Measured at Fair Value on a Nonrecurring Basis | 9,026 |  | 9,001 |
Equity Investments [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Assets Measured at Fair Value on a Nonrecurring Basis | 142 |  | 142 |
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 |  | 142 |
Fair Value, Inputs, Level 1 [Member] |  |  |  |
Assets Measured at Fair Value on a Nonrecurring Basis | 142 |  | 142 |
Fair Value, Inputs, Level 2 [Member] |  |  |  |
Assets Measured at Fair Value on a Nonrecurring Basis | 24,892 |  | 27,149 |
Fair Value, Inputs, Level 3 [Member] |  |  |  |
Assets Measured at Fair Value on a Nonrecurring Basis | 102,909 |  | 86,785 |
Estimate of Fair Value, Fair Value Disclosure [Member] |  |  |  |
Assets Measured at Fair Value on a Nonrecurring Basis | $ 127,943 |  | $ 114,076 |
[1] | Other real estate owned balance of $45.3 million in the consolidated balance sheet is net of estimated disposal costs.
[2] | Other real estate owned balance of $46.4 million in the consolidated balance sheet is net of estimated disposal costs.

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- Definition The charge against earnings resulting from the aggregate write down of all assets from their carrying value to their fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 45, 46, 47 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2420-110228 + Details
Name: | us-gaap_AssetImpairmentCharges
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a nonrecurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
Name: | us-gaap_AssetsFairValueDisclosureNonrecurring
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant