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Note 6 - Goodwill and Other Intangible Assets (Details Textual) - USD ($) | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Sep. 09, 2016 | Feb. 27, 2015
Goodwill |  | $ 327,686,000 |  |  | $ 348,505,000 | $ 327,686,000 |  |  |
Amortization of Intangible Assets |  |  |  |  | 5,945,000 | 4,889,000 | $ 1,979,000 |  |
Core Deposit Premium [Member] |  |  |  |  |  |  |  |  |
Amortization of Intangible Assets |  |  |  |  | $ 4,400,000 | 3,900,000 | 1,400,000 |  |
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 | 528,000 | 151,000 |  |
Books of Business Intangible [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  |  |  | 10 years |  |  |  |
Books of Business Intangible [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  |  |  | 15 years |  |  |  |
Purchased Credit Card Relationships [Member] |  |  |  |  |  |  |  |  |
Amortization of Intangible Assets |  |  |  |  | $ 414,000 | 414,000 | $ 414,000 |  |
Citizens National Bank [Member] |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  | $ 21,495,000 |
Goodwill, Acquired During Period |  |  |  |  | 21,500,000 |  |  |  |
Citizens National Bank [Member] | Core Deposit Premium [Member] |  |  |  |  |  |  |  |  |
Finite-lived Intangible Assets Acquired |  |  |  |  | $ 5,100,000 |  |  |  |
Citizens National Bank [Member] | Books of Business Intangible [Member] |  |  |  |  |  |  |  |  |
Finite-lived Intangible Assets Acquired | $ 591,000 |  |  |  |  |  |  |  |
Liberty Bancshares, Inc. [Member] |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  | $ 95,207,000
Goodwill, Acquired During Period |  |  |  |  |  | 95,200,000 |  |  |
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
Goodwill, Acquired During Period |  |  |  |  |  | 110,400,000 |  |  |
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, Acquired During Period |  |  |  |  |  | $ 13,300,000 |  |  |
Ozark Trust [Member] | Books of Business Intangible [Member] |  |  |  |  |  |  |  |  |
Finite-lived Intangible Assets Acquired |  | $ 9,700,000 |  |  |  |  |  |  |

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