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Note 7 - Investments in Affordable Housing (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Affordable Housing Investments | $ 85,037,000 | $ 78,358,000 |
Number of Limited Partnerships in Housing Investments | 6 |  |
Increase In Total Assets And Liabilities From Consolidating Affordable Housing Equity Interest | 22,900,000 | 22,800,000 |
Other Borrowings From Consolidating Affordable Housing Equity Interest | 18,700,000 | 18,900,000 |
Other Liabilities From Affordable Housing Unfunded Commitments | 10,600,000 | 1,500,000 |
Minimum Compliance Period, Tax Credits, Investments In Affordable Housing | 15 years |  |
Income Tax Reconciliation, Tax Credits, Investment | 9,200,000 | 9,500,000 | 10,500,000
PreTaxLossesInvestmentsInAffordableHousing | 6,300,000 | 8,200,000 | 7,600,000
Federal Tax [Member] | Affordable Housing Limited Partnerships [Member] |  |  |
Tax Credit Carryforward, Amount | 45,300,000 |  |
State and Local Jurisdiction [Member] | Affordable Housing Limited Partnerships [Member] |  |  |
Tax Credit Carryforward, Amount | $ 1,700,000 |  |

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