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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.

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- 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.

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+ References

No definition available.

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X

- 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

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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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
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-Section 45
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-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
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-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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X

- 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

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