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Note 8 - Loans (Details Textual) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Dec. 31, 2016
Impaired Financing Receivable, Recorded Investment | $ 127,671,000 |  | $ 127,671,000 |  | $ 127,671,000 | $ 115,074,000
Percentage Of Charge Off To Contractual Balances For Impaired Loans | 7.10% |  | 7.10% |  | 7.10% | 8.40%
Allowance for Credit Losses, Change in Method of Calculating Impairment | $ 678,000 | $ 208,000 | $ 678,000 | $ 208,000 | $ 678,000 |
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down | 305,000 |  | 305,000 |  |  |
Loans and Leases Receivable, Impaired, Commitment to Lend | 0 |  | 0 |  | 0 |
Commercial Portfolio Segment [Member] |  |  |  |  |  |
Allowance for Credit Losses, Change in Method of Calculating Impairment | 636,000 | 208,000 | 636,000 | 208,000 | 636,000 |
Financing Receivable, Modifications, Subsequent Default, Recorded Investment |  |  | 50,000 |  |  |
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down |  |  |  |  | 2,100,000 |
Minimum [Member] |  |  |  |  |  |
Period Loan Is In Payment Default |  |  | 60 days |  |  |
Maximum [Member] |  |  |  |  |  |
Period Loan Is In Payment Default |  |  | 90 days |  |  |
Rate Reduction [Member] | Minimum [Member] |  |  |  |  |  |
Troubled Debt Restructurings Length Of Modifications |  |  | 90 days |  |  |
Nonaccrual Loans [Member] |  |  |  |  |  |
Impaired Financing Receivable, Recorded Investment | 65,300,000 |  | $ 65,300,000 |  | 65,300,000 | $ 49,700,000
Accruing Troubled Debt Restructuring [Member] |  |  |  |  |  |
Impaired Financing Receivable, Recorded Investment | 62,400,000 |  | 62,400,000 |  | 62,400,000 | 65,400,000
Financing Receivable, Modifications, Recorded Investment | 62,400,000 |  | 62,400,000 |  | 62,400,000 | 65,400,000
Allowance for Credit Losses, Change in Method of Calculating Impairment | 1,100,000 |  | 1,100,000 |  | 1,100,000 | 1,300,000
Non-accruing Troubled Debt Restructuring [Member] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 33,700,000 |  | 33,700,000 |  | 33,700,000 | 29,700,000
Allowance for Credit Losses, Change in Method of Calculating Impairment | $ 143,000 |  | $ 143,000 |  | $ 143,000 | $ 1,100,000

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