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Note 7 - Loans (Details Textual) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2016 USD ($) | Dec. 31, 2015 USD ($)
Commercial Portfolio Segment [Member] |  |
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | 0 |
Nonaccrual Loans [Member] |  |
Impaired Financing Receivable, Recorded Investment | $ 44,400,000 | $ 52,100,000
Accruing Troubled Debt Restructuring [Member] |  |
Impaired Financing Receivable, Recorded Investment | 86,600,000 | 81,700,000
Financing Receivable, Modifications, Recorded Investment | 86,600,000 | 81,700,000
Allowance for Credit Losses, Change in Method of Calculating Impairment | 1,300,000 | 2,000,000
Non-accruing Troubled Debt Restructuring [Member] |  |
Financing Receivable, Modifications, Recorded Investment | 20,900,000 | 39,900,000
Allowance for Credit Losses, Change in Method of Calculating Impairment | $ 300,000 | 5,400,000
Rate Reduction [Member] | Maximum [Member] |  |
Troubled Debt Restructurings Length Of Modifications | 90 days |
Rate Reduction [Member] | Minimum [Member] |  |
Troubled Debt Restructurings Length Of Modifications | 300 days |
Maximum [Member] |  |
Period Loan Is In Payment Default | 90 days |
Minimum [Member] |  |
Period Loan Is In Payment Default | 60 days |
Loans and Leases Receivable, Impaired, Commitment to Lend | $ 0 |
Impaired Financing Receivable, Recorded Investment | $ 130,914,000 | $ 133,810,000
Percentage Of Charge Off To Contractual Balances For Impaired Loans | 7.70% | 22.40%

X
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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=25495931&loc=d3e18845-111554 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Recorded Investment -URI http://asc.fasb.org/extlink&oid=65880944 + Details
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