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Note 7 - Goodwill and Other Intangible Assets (Details Textual) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2017 | Jun. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2017 | Dec. 31, 2016 | May 15, 2017 | Sep. 09, 2016
Goodwill | $ 375,731,000 |  | $ 348,505,000 | $ 375,731,000 | $ 348,505,000 |  |
Goodwill, Written off Related to Sale of Business Unit |  |  |  | 4,100,000 |  |  |
Finite-Lived Intangible Assets, Period Increase (Decrease) | $ (1,300,000) |  |  |  |  |  |
Goodwill, Impairment Loss |  |  |  | $ 0 | $ 0 |  |
Minimum [Member] |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  |  | 10 years |  |  |
Maximum [Member] |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  |  | 15 years |  |  |
Core Deposit Premium [Member] | Minimum [Member] |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  |  | 10 years |  |  |
Core Deposit Premium [Member] | Maximum [Member] |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  |  | 15 years |  |  |
Hardeman County Investment Company, Inc. [Member] |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | $ 29,402,000 |
Finite-lived Intangible Assets Acquired |  | $ 830,000 |  |  |  |  |
Hardeman County Investment Company, Inc. [Member] | Core Deposit Premium [Member] |  |  |  |  |  |  |
Finite-lived Intangible Assets Acquired |  | $ 7,800,000 |  |  |  |  |
Citizens National Bank [Member] |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | $ 23,376,000
Finite-lived Intangible Assets Acquired |  |  | 591,000 |  |  |  |
Citizens National Bank [Member] | Core Deposit Premium [Member] |  |  |  |  |  |  |
Finite-lived Intangible Assets Acquired |  |  | $ 5,100,000 |  |  |  |

X
- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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X
- Definition Amount of increase (decrease) in carrying value of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References No definition available. + Details
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- Definition Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition. + References No definition available. + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 + Details
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X
- Definition Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13777-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition Amount of divestiture of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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