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Note 11 - Derivative Financial Instruments - Derivative Financial Instruments (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Interest rate swaps, notional amount |  | $ 739,262 | $ 739,726 |
Interest rate swaps, net carrying value | [1] | 26,270 | 3,630 |
Designated as Hedging Instrument [Member] |  |  |  |
Interest rate swaps, notional amount |  | 261,400 | 261,900 |
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] |  |  |  |
Interest rate swaps, notional amount |  | 441,500 | 441,500 | $ 0
Not Designated as Hedging Instrument [Member] |  |  |  |
Interest rate swaps, notional amount |  | 36,300 | 36,300 |
Interest Rate Swaps 1 [Member] | Designated as Hedging Instrument [Member] | Fair Value Hedging [Member] |  |  |  |
Interest rate swaps, notional amount |  | 259,747 | 199,341 |
Interest rate swaps, net carrying value | [1] | 15,677 | 6,971 |
Interest Rate Swaps 1 [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] |  |  |  |
Interest rate swaps, notional amount |  | 441,500 | 250,000 |
Interest rate swaps, net carrying value | [1] | 11,721 | 417 |
Interest Rate Swaps 2 [Member] | Designated as Hedging Instrument [Member] | Fair Value Hedging [Member] |  |  |  |
Interest rate swaps, notional amount |  | 1,694 | 62,564 |
Interest rate swaps, net carrying value | [1] | (12) | (921) |
Interest Rate Swaps 2 [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] |  |  |  |
Interest rate swaps, notional amount |  |  | 191,500 |
Interest rate swaps, net carrying value | [1] |  | (7) |
Interest Rate Swap [Member] |  |  |  |
Interest rate swaps, notional amount |  | 279,800 | 280,200 |
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] |  |  |  |
Interest rate swaps, notional amount |  | 36,321 | 36,321 |
Interest rate swaps, net carrying value | [1] | $ (1,116) | $ (2,830) |
[1] | Derivatives in a net positive position are recorded as "Other assets" and derivatives in a net negative position are recorded as "Other liabilities" in the Consolidated Statements of Financial Condition.

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- Definition Nominal or face amount used to calculate payments on the derivative asset. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959 + Details
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- Definition Fair value as of the balance sheet date of interest rate derivative assets, net of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized on the balance sheet. + References No definition available. + Details
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