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Note 7 - Goodwill and Other Intangible Assets (Details Textual) - USD ($)	3 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Oct. 19, 2017	May 15, 2017	Sep. 09, 2016	Oct. 29, 2015	Feb. 27, 2015
Goodwill			$ 842,651,000	$ 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)
Amortization of Intangible Assets			$ 7,668,000	5,945,000	$ 4,889,000
Minimum [Member]
Finite-Lived Intangible Asset, Useful Life			10 years
Maximum [Member]
Finite-Lived Intangible Asset, Useful Life			15 years
Core Deposit Premium [Member]
Amortization of Intangible Assets			$ 6,000,000	4,400,000	3,900,000
Core Deposit Premium [Member] | Salina Banking Operations [Member]
Decrease in Intangible Assets from The Sale of Business		$ 382,000
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
Books of Business Intangible [Member]
Amortization of Intangible Assets			$ 1,100,000	1,100,000	528,000
Purchased Credit Card Relationships [Member]
Amortization of Intangible Assets			414,000	414,000	414,000
OKSB Merger [Member]
Goodwill						$ 228,932,000
OKSB Merger [Member] | Core Deposit Premium [Member]
Finite-lived Intangible Assets Acquired			42,100,000
OKSB Merger [Member] | Other Intangible Assets [Member]
Finite-lived Intangible Assets Acquired			3,800,000
First Texas BHC, Inc. [Member]
Goodwill						$ 238,000,000
First Texas BHC, Inc. [Member] | Core Deposit Premium [Member]
Finite-lived Intangible Assets Acquired			7,300,000
Hardeman County Investment Company, Inc. [Member]
Goodwill							$ 29,371,000
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
Liberty Bancshares, Inc. [Member]
Goodwill										$ 95,207,000
Liberty Bancshares, Inc. [Member] | Core Deposit Premium [Member]
Finite-lived Intangible Assets Acquired					14,600,000
Community First Bancshares Inc [Member]
Goodwill										$ 110,440,000
Community First Bancshares Inc [Member] | Core Deposit Premium [Member]
Finite-lived Intangible Assets Acquired					11,300,000
Community First Bancshares Inc [Member] | Books of Business Intangible [Member]
Finite-lived Intangible Assets Acquired					420,000
Ozark Trust [Member]
Goodwill									$ 13,300,000
Ozark Trust [Member] | Books of Business Intangible [Member]
Finite-lived Intangible Assets Acquired					$ 9,700,000

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- Definition

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+ References

No definition available.

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 45
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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

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Amount of increase (decrease) in carrying value of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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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

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