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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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