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Note 7 - Loans (Details Textual) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Impaired Financing Receivable, Recorded Investment | $ 143,863,000 |  | $ 143,863,000 |  | $ 115,074,000
Percentage Of Charge Off To Contractual Balances For Impaired Loans | 10.00% |  | 10.00% |  | 8.40%
Allowance for Credit Losses, Change in Method of Calculating Impairment |  | $ 171,000 |  | $ 171,000 |
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down |  |  |  |  |
Loans and Leases Receivable, Impaired, Commitment to Lend | 0 |  | 0 |  |
Commercial Portfolio Segment [Member] |  |  |  |  |
Allowance for Credit Losses, Change in Method of Calculating Impairment |  | 148,000 |  | 148,000 |
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 |  |
Rate Reduction [Member] | Maximum [Member] |  |  |  |  |
Troubled Debt Restructurings Length Of Modifications |  |  | 300 days |  |
Nonaccrual Loans [Member] |  |  |  |  |
Impaired Financing Receivable, Recorded Investment | 64,000,000 |  | $ 64,000,000 |  | $ 49,700,000
Accruing Troubled Debt Restructuring [Member] |  |  |  |  |
Impaired Financing Receivable, Recorded Investment | 79,800,000 |  | 79,800,000 |  | 65,400,000
Financing Receivable, Modifications, Recorded Investment | 79,800,000 |  | 79,800,000 |  | 65,400,000
Allowance for Credit Losses, Change in Method of Calculating Impairment | 523,000 |  | 523,000 |  | 1,300,000
Non-accruing Troubled Debt Restructuring [Member] |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 30,000,000 |  | 30,000,000 |  | 29,700,000
Allowance for Credit Losses, Change in Method of Calculating Impairment | $ 681,000 |  | $ 681,000 |  | $ 1,100,000

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- Definition The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings. + 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=82895541&loc=d3e18845-111554 + Details
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