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Note 14 - Financial Derivatives (Details Textual) | 1 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2014 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Junior Subordinated Notes | $ 119,100,000 | $ 119,136,000 |  |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax |  | 825,000 | $ (598,000) | $ (2,397,000)
Cash [Member] |  |  |  |
Collateral Already Posted, Aggregate Fair Value |  | 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 | 0.98% |  |  |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax |  | 2,200,000 | 3,000,000 |
Interest Rate Swap [Member] | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Interest Expense [Member] |  |  |  |
Net Accrued on Interest Rate Swaps |  | 2,300,000 | 2,800,000 |
Interest Rate Swap [Member] | Fair Value Hedging [Member] | Designated as Hedging Instrument [Member] |  |  |  |
Derivative Outstanding, Notional Amount |  | $ 361,500,000 | 340,300,000 |
Derivative Original Maturity |  | 8 years |  |
Derivative, Average Fixed Interest Rate |  | 4.61% |  |
Derivative, Average Variable Interest Rate |  | 3.82% |  |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax |  | $ 938,000 | 1,300,000 |
Derivative, Notional Amount at Origination |  | $ 361,500,000 |  |
Derivative, Average Basis Spread on Variable Rate |  | 3.16% |  |
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] | Interest Expense [Member] |  |  |  |
Net Accrued on Interest Rate Swaps |  | $ 3,600,000 | 3,300,000 |
Negative Fair Value [Member] |  |  |  |
Notional Amount Of Option Contract |  | 12,100,000 | 9,400,000 |
Open OptionContracts Fair Value |  | 121,000 | 28,000 |
Sum Of Spot And Forward Contract Notional Amount |  | 89,500,000 | 115,400,000 |
Negative Fair Value |  | 3,100,000 | 4,100,000 |
Positive Fair Value [Member] |  |  |  |
Sum Of Spot And Forward Contract Notional Amount |  | 82,400,000 | 100,600,000 |
Positive Fair Value |  | $ 1,300,000 | $ 3,300,000 |

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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=64837297&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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