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Note 14 - Financial Derivatives (Details Textual) |  | 12 Months Ended |
--- | --- | --- | ---
May 31, 2014 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Sep. 30, 2017 USD ($)
Junior Subordinated Notes | $ 119,100,000 | $ 119,136,000 |  |  |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax |  | 719,000 | $ 825,000 | $ (598,000) |
Cash [Member] |  |  |  |  |
Collateral Already Posted, Aggregate Fair Value |  | 4,500,000 | 6,900,000 |  |
Interest Rate Swap [Member] | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] |  |  |  |  |
Derivative Asset, Number of Instruments Held | 5 |  |  |  |
Derivative Outstanding, Notional Amount | $ 119,100,000 |  |  |  | $ 119,100,000
Derivative Original Maturity | 10 years |  |  |  |
Derivative, Average Fixed Interest Rate | 2.61% |  |  |  |
Derivative, Average Variable Interest Rate | 1.60% |  |  |  |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax |  | (1,500,000) | (2,200,000) |  |
Net Accrued on Interest Rate Swaps |  | 1,700,000 | 2,300,000 |  |
Interest Rate Swap [Member] | Fair Value Hedging [Member] | Designated as Hedging Instrument [Member] |  |  |  |  |
Derivative Outstanding, Notional Amount |  | $ 540,400,000 | 361,500,000 |  |
Derivative, Average Fixed Interest Rate |  | 4.60% |  |  |
Derivative, Average Variable Interest Rate |  | 4.30% |  |  |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax |  | $ 5,000,000 |  | $ 938,000 |
Net Accrued on Interest Rate Swaps |  | 2,400,000 | 3,600,000 |  |
Derivative, Notional Amount at Origination |  | $ 540,400,000 |  |  |
Derivative, Average Basis Spread on Variable Rate |  | 2.89% |  |  |
Interest Rate Swap [Member] | Fair Value Hedging [Member] | Designated as Hedging Instrument [Member] | Minimum [Member] |  |  |  |  |
Derivative Original Maturity |  | 2 years |  |  |
Interest Rate Swap [Member] | Fair Value Hedging [Member] | Designated as Hedging Instrument [Member] | Maximum [Member] |  |  |  |  |
Derivative Original Maturity |  | 10 years |  |  |
Negative Fair Value [Member] |  |  |  |  |
Notional Amount Of Option Contract |  | $ 1,000,000 | 12,100,000 |  |
Open Option Contracts Fair Value |  | 9,000 | 121,000 |  |
Sum Of Spot And Forward Contract Notional Amount |  | 32,100,000 | 89,500,000 |  |
Negative Fair Value |  | 453,000 | 3,100,000 |  |
Positive Fair Value [Member] |  |  |  |  |
Sum Of Spot And Forward Contract Notional Amount |  | 108,500,000 | 82,400,000 |  |
Positive Fair Value |  | $ 1,800,000 | $ 1,300,000 |  |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References No definition available. + Details
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- Definition Outstanding notional amount specified by the derivative(s). Expressed as an absolute value. + References No definition available. + Details
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- Definition The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624258-113959 + Details
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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of long-term debt (with maturities initially due after one year or beyond the operating cycle if longer) identified as Junior Subordinated Notes, which have a lower priority than senior instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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