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Note 15 - Financial Derivatives (Details Textual) - USD ($) |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
May 31, 2014 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Junior Subordinated Notes, Total | $ 119,100,000 |  |  |  |  |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax |  | $ 1,666,000 | $ 157,000 | $ 4,595,000 | $ (94,000) |
Cash [Member] |  |  |  |  |  |
Collateral Already Posted, Aggregate Fair Value |  | 0 |  | 0 |  | $ 4,500,000
Interest Rate Swap [Member] | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] |  |  |  |  |  |
Derivative Outstanding, Notional Amount | $ 119,100,000 | $ 119,100,000 |  | $ 119,100,000 |  |
Derivative Original Maturity | 10 years |  |  |  |  |
Derivative, Average Fixed Interest Rate | 2.61% |  |  |  |  |
Derivative, Average Variable Interest Rate |  | 2.35% |  | 2.35% |  |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax |  |  |  | $ 1,900,000 | 2,300,000 |
Net Accrued on Interest Rate Swaps |  | $ 83,000 | 407,000 | 480,000 | 1,300,000 |
Interest Rate Swap [Member] | Fair Value Hedging [Member] | Designated as Hedging Instrument [Member] |  |  |  |  |  |
Derivative Outstanding, Notional Amount |  | $ 637,700,000 | 510,600,000 | $ 637,700,000 | 510,600,000 |
Derivative, Average Fixed Interest Rate |  | 4.71% |  | 4.71% |  |
Derivative, Average Variable Interest Rate |  | 4.78% |  | 4.78% |  |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax |  |  |  | $ 15,700,000 | 1,900,000 |
Net Accrued on Interest Rate Swaps |  | $ 96,000 | $ 514,000 | $ 132,000 | $ 1,900,000 |
Interest Rate Swap [Member] | Fair Value Hedging [Member] | Designated as Hedging Instrument [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |
Derivative, Average Basis Spread on Variable Rate |  | 2.66% |  | 2.66% |  |
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 |  | $ 1,600,000 |  | $ 1,600,000 |  | 1,000,000
Open Option Contracts Fair Value |  | 4,000 |  | 4,000 |  | 9,000
Sum Of Spot And Forward Contract Notional Amount |  | 117,600,000 |  | 117,600,000 |  | 32,100,000
Negative Fair Value |  | 1,600,000 |  | 1,600,000 |  | 453,000
Positive Fair Value [Member] |  |  |  |  |  |
Sum Of Spot And Forward Contract Notional Amount |  | 53,400,000 |  | 53,400,000 |  | 108,500,000
Positive Fair Value |  | $ 400,000 |  | $ 400,000 |  | $ 1,800,000

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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 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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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