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Note 6 - Loans Acquired (Details Textual) - USD ($) |  | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 15, 2015 | Sep. 30, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Jun. 30, 2017 | Sep. 30, 2016 | Mar. 31, 2015
FDIC Indemnification Asset, Cash Payments Received | $ 2,368,000 | $ 2,368,000 |  |  |  |  |  |
Gain (Loss) on Contract Termination | $ (7,476,000) | $ (7,476,000) |  |  | $ (7,476,000) |  |  |
Non Covered Impaired Loans Allowance Reclassified |  |  |  |  | 954,000 |  |  |
Covered Purchased Impaired Loans Allowance |  |  | 418,000 | 954,000 | $ 954,000 |  |  |
FDIC Indemnification Asset, Accretion of Discount |  |  | 0 | 0 |  |  |  |
Acquired Loans [Member] |  |  |  |  |  |  |  |
Non Covered Impaired Loans Allowance Reclassified |  |  | 418,000 | $ 954,000 |  |  |  |
OKSB Merger [Member] |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans, Net |  |  | 1,985,000,000 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans, Gross |  |  | 2,021,000,000 |  |  |  |  |
Loans Acquired Discount |  |  | 36,300,000 |  |  |  |  |
OKSB Merger [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans, Net |  |  | 11,400,000 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans, Gross |  |  | 18,100,000 |  |  |  |  |
Loans Acquired Discount |  |  | 6,700,000 |  |  |  |  |
First Texas Merger [Member] |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans, Net |  |  | 2,208,000,000 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans, Gross |  |  | 2,246,000,000 |  |  |  |  |
Loans Acquired Discount |  |  | $ 37,800,000 |  |  |  |  |
Hardeman County Investment Company, Inc. [Member] |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans, Net |  |  |  |  |  | $ 249,200,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans, Gross |  |  |  |  |  | 254,200,000 |  |
Loans Acquired Discount |  |  |  |  |  | 5,000,000 |  |
Hardeman County Investment Company, Inc. [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans, Net |  |  |  |  |  | 2,400,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans, Gross |  |  |  |  |  | 3,400,000 |  |
Loans Acquired Discount |  |  |  |  |  | $ 990,000 |  |
Citizens National Bank [Member] |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans, Net |  |  |  |  |  |  | $ 340,100,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans, Gross |  |  |  |  |  |  | 348,800,000 |
Loans Acquired Discount |  |  |  |  |  |  | 8,700,000 |
Citizens National Bank [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans, Net |  |  |  |  |  |  | 757,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans, Gross |  |  |  |  |  |  | 1,600,000 |
Loans Acquired Discount |  |  |  |  |  |  | $ 848,000 |
Liberty Bancshares, Inc. [Member] |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans, Net |  |  |  |  |  |  |  | $ 769,900,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans, Gross |  |  |  |  |  |  |  | 774,800,000
Loans Acquired Discount |  |  |  |  |  |  |  | 4,900,000
Liberty Bancshares, Inc. [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans, Net |  |  |  |  |  |  |  | 10,700,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans, Gross |  |  |  |  |  |  |  | 15,700,000
Loans Acquired Discount |  |  |  |  |  |  |  | 5,000,000
Community First Bancshares Inc [Member] |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans, Net |  |  |  |  |  |  |  | 1,130,000,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans, Gross |  |  |  |  |  |  |  | 1,150,000,000
Loans Acquired Discount |  |  |  |  |  |  |  | 23,700,000
Community First Bancshares Inc [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans, Net |  |  |  |  |  |  |  | 7,000,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans, Gross |  |  |  |  |  |  |  | 10,100,000
Loans Acquired Discount |  |  |  |  |  |  |  | $ 3,100,000

X
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