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Note 7 - Loans (Detail) (USD $) | 12 Months Ended |  |  |  |  |  |  |  | 3 Months Ended |  |  | 3 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2013 Nonaccrual Loans [Member] | Dec. 31, 2012 Nonaccrual Loans [Member] | Mar. 31, 2013 Accruing Troubled Debt Restructuring Member | Dec. 31, 2012 Accruing Troubled Debt Restructuring Member | Mar. 31, 2013 Accruing Troubled Debt Restructuring Member | Dec. 31, 2012 Accruing Troubled Debt Restructuring Member | Mar. 31, 2013 Non Accruing Troubled Debt Restructuring Member | Mar. 31, 2012 Non Accruing Troubled Debt Restructuring Member | Dec. 31, 2012 Non Accruing Troubled Debt Restructuring Member | Mar. 31, 2013 Reduction Of Stated Interest Rate Member Minimum [Member] | Mar. 31, 2013 Reduction Of Stated Interest Rate Member Maximum [Member] | Mar. 31, 2013 Extension of Maturity Date [Member] Minimum [Member] | Mar. 31, 2013 Extension of Maturity Date [Member] Maximum [Member] | Mar. 31, 2013 Land Loan Member | Mar. 31, 2013 Commercial Real Estate Loans [Member] | Mar. 31, 2013 Minimum [Member] | Mar. 31, 2013 Maximum [Member]
Impaired Financing Receivable, Recorded Investment | $ 230,544,000 | $ 248,597,000 | $ 100,300,000 | $ 103,900,000 | $ 130,200,000 | $ 144,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage Of Charge-Off To Contractual Balances For Impaired Loans | 22.10% | 23.20% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Troubled Debt Restructurings, Total |  |  |  |  |  |  | 130,200,000 | 144,700,000 | 49,900,000 |  | 47,700,000 |  |  |  |  |  |  |  |
Impaired Financing Receivable, Modifications, Related Allowance |  |  |  |  |  |  | 4,700,000 | 1,100,000 | 7,600,000 |  | 7,800,000 |  |  |  |  |  |  |  |
Troubled Debt Restructurings Length of Modifications |  |  |  |  |  |  |  |  |  |  |  | 6 months | 12 months | 3 years | 25 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000,000 | 111,000,000,000 |  |
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down | $ 0 |  |  |  |  |  |  |  | $ (679,000) | $ (4,018,000) |  |  |  |  |  |  |  |  |

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- Definition Financing receivable modifications recorded investment defaulted within 12 months. + References No definition available. + Details
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- Definition Amount of allowance for credit losses related to recorded investment on modified loans. + References No definition available. + Details
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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=6951948&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=7512638&loc=SL6953550-111524 + Details
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