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Note 11 - Fair Value of Financial Instruments - Quantitative Information About Recurring Level 3 Fair Value of Financial Instruments (Details) $ in Thousands | Jun. 30, 2019 USD ($) | Dec. 31, 2018 USD ($)
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Securities available for sale, fair value | $ 808,653 | $ 822,655
Valuation Technique, Discounted Cash Flow [Member] | Junior Subordinated Debentures [Member] |  |
Liabilities, Fair Value | $ 43,414 | $ 41,849
Valuation Technique, Discounted Cash Flow [Member] | Weighted Average [Member] | Measurement Input, Discount Rate [Member] | Junior Subordinated Debentures [Member] |  |
Liabilities, Weighted average | 0.044 | 0.049
Trust Preferred Securities [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |
Securities available for sale, fair value | $ 1,303 | $ 1,256
Trust Preferred Securities [Member] | Valuation Technique, Discounted Cash Flow [Member] | Weighted Average [Member] | Measurement Input, Discount Rate [Member] |  |
Assets, Weighted average | 0.044 | 0.049

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118954083&loc=d3e26610-111562 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
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- Definition Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13433-108611 + Details
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- Definition Value of input used to measure debt instrument, including, but not limited to, convertible and non-convertible debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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