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Note 8 - Loans (Details) | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Dec. 31, 2014 USD ($) | Sep. 30, 2014 USD ($) | Jun. 30, 2014 USD ($) | Dec. 31, 2013 USD ($)
Note 8 - Loans (Details) [Line Items] |  |  |  |  |  |
Impaired Financing Receivable, Recorded Investment | $ 161,122,000 |  | $ 174,519,000 |  |  |
Percentage of Charge-off to Contractual Balances for Impaired Loans | 18.90% |  | 17.10% |  |  |
Loans and Leases Receivable, Impaired, Commitment to Lend | $ 0 |  |  |  |  |
Loans Receivable Held-for-sale, Net, Not Part of Disposal Group | 0 |  | $ 973,000 |  |  |
Nonaccrual Loans [Member] |  |  |  |  |  |
Note 8 - Loans (Details) [Line Items] |  |  |  |  |  |
Impaired Financing Receivable, Recorded Investment | 71,200,000 |  | 70,200,000 |  |  |
Financing Receivable, Modifications, Recorded Investment | 41,800,000 |  | 41,600,000 |  |  |
Allowance for Credit Losses, Change in Method of Calculating Impairment | 5,500,000 |  | 4,900,000 |  |  |
Accruing Troubled Debt Restructuring [Member] |  |  |  |  |  |
Note 8 - Loans (Details) [Line Items] |  |  |  |  |  |
Impaired Financing Receivable, Recorded Investment | 89,900,000 |  | 104,300,000 |  |  |
Financing Receivable, Modifications, Recorded Investment | 89,881,000 | $ 100,011,000 | 104,356,000 | $ 123,089,000 | $ 111,136,000 | $ 117,597,000
Allowance for Credit Losses, Change in Method of Calculating Impairment | $ 1,100,000 |  | 6,500,000 |  |  |
Commercial Portfolio Segment [Member] |  |  |  |  |  |
Note 8 - Loans (Details) [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | 0 |  |  |  |  |
Commercial Portfolio Segment [Member] | Accruing Troubled Debt Restructuring [Member] |  |  |  |  |  |
Note 8 - Loans (Details) [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | $ 12,872,000 |  | $ 16,506,000 |  |  |
Minimum [Member] |  |  |  |  |  |
Note 8 - Loans (Details) [Line Items] |  |  |  |  |  |
Period Loan is in Payment Default | 60 days |  |  |  |  |
Minimum [Member] | Reduction of Interest Rate and Change in Payment Terms [Member] |  |  |  |  |  |
Note 8 - Loans (Details) [Line Items] |  |  |  |  |  |
Troubled Debt Restructurings Length of Modifications | 6 months |  |  |  |  |
Maximum [Member] |  |  |  |  |  |
Note 8 - Loans (Details) [Line Items] |  |  |  |  |  |
Period Loan is in Payment Default | 90 days |  |  |  |  |
Maximum [Member] | Reduction of Interest Rate and Change in Payment Terms [Member] |  |  |  |  |  |
Note 8 - Loans (Details) [Line Items] |  |  |  |  |  |
Troubled Debt Restructurings Length of Modifications | 3 years |  |  |  |  |

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