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Note 7 - Loans (Details) (USD $) | 12 Months Ended |  |  |  |  |  |  | 6 Months Ended | 3 Months Ended | 6 Months Ended |  | 3 Months Ended | 6 Months Ended |  | 6 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2013 | Dec. 31, 2012 | Jun. 30, 2013 Nonaccrual Loans [Member] | Dec. 31, 2012 Nonaccrual Loans [Member] | Jun. 30, 2013 Accruing Troubled Debt Restructuring Member | Dec. 31, 2012 Accruing Troubled Debt Restructuring Member | Jun. 30, 2013 Reduction Of Stated Interest Rate Member Minimum [Member] | Jun. 30, 2013 Reduction Of Stated Interest Rate Member Maximum [Member] | Jun. 30, 2013 Land Loan Member | Jun. 30, 2013 Commercial Real Estate Loans [Member] | Jun. 30, 2013 Accruing Troubled Debt Restructuring Member | Jun. 30, 2012 Accruing Troubled Debt Restructuring Member | Jun. 30, 2013 Accruing Troubled Debt Restructuring Member | Jun. 30, 2012 Accruing Troubled Debt Restructuring Member | Dec. 31, 2012 Accruing Troubled Debt Restructuring Member | Jun. 30, 2013 Non Accruing Troubled Debt Restructuring Member | Jun. 30, 2012 Non Accruing Troubled Debt Restructuring Member | Jun. 30, 2013 Non Accruing Troubled Debt Restructuring Member | Jun. 30, 2012 Non Accruing Troubled Debt Restructuring Member | Dec. 31, 2012 Non Accruing Troubled Debt Restructuring Member | Jun. 30, 2013 Minimum [Member] | Jun. 30, 2013 Maximum [Member]
Note 7 - Loans (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impaired Financing Receivable, Recorded Investment | $ 211,077,000 | $ 248,597,000 | $ 95,600,000 | $ 103,900,000 | $ 115,500,000 | $ 144,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage Of Charge-Off To Contractual Balances For Impaired Loans | 23.70% | 23.20% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Troubled Debt Restructurings, Total |  |  |  |  |  |  |  |  |  |  | 115,500,000 |  | 115,500,000 |  | 144,700,000 | 48,500,000 |  | 48,500,000 |  | 47,700,000 |  |
Impaired Financing Receivable, Modifications, Related Allowance |  |  |  |  |  |  |  |  |  |  | 5,200,000 |  | 5,200,000 |  | 1,100,000 | 4,600,000 |  | 4,600,000 |  | 7,800,000 |  |
Troubled Debt Restructurings Length of Modifications |  |  |  |  |  |  | 12 months | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period Loan Is In Payment Default |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 60 days | 90 days
Financing Receivable Modification Number Of Contracts Defaulted Within 12 Months |  |  |  |  |  |  |  |  | 1 | 2 |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable Modifications Recorded Investment Defaulted Within 12 Months |  |  |  |  |  |  |  |  | 1,800,000 | 111,000 |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down | $ 254,000 |  |  |  |  |  |  |  |  |  | $ (78,000) | $ 0 | $ (78,000) | $ 0 |  | $ (254,000) | $ (267,000) | $ (933,000) | $ (4,285,000) |  |  |

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- Definition Reflects the amount of the write-down related to a troubled debt restructuring. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554 + Details
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- Definition Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953550-111524 + Details
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