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Consolidated Statements of Stockholders' Equity (Parentheticals) - $ / shares | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Additional Paid-in Capital [Member] |  |  |  |
Stock issued for employee stock purchase plan, shares (in shares) | [1] | 26,002 | 31,470 | 13,056
Common Stock [Member] | Community First Bancshares Inc [Member] |  |  |  |
Stock issued for acquisition, shares (in shares) | [1] |  |  | 13,105,832
Common Stock [Member] | Liberty Bancshares, Inc. [Member] |  |  |  |
Stock issued for acquisition, shares (in shares) | [1] |  |  | 10,362,674
Common Stock [Member] | Ozark Trust [Member] |  |  |  |
Stock issued for acquisition, shares (in shares) | [1] |  |  | 678,580
Common Stock [Member] | Citizens National Bank [Member] |  |  |  |
Stock issued for acquisition, shares (in shares) | [1] |  | 1,671,482 |
Common Stock [Member] | Hardeman County Investment Company, Inc. [Member] |  |  |  |
Stock issued for acquisition, shares (in shares) | [1] | 1,599,940 |  |
Common Stock [Member] | OKSB Merger [Member] |  |  |  |
Stock issued for acquisition, shares (in shares) | [1] | 14,488,604 |  |
Common Stock [Member] | First Texas Merger [Member] |  |  |  |
Stock issued for acquisition, shares (in shares) | [1] | 12,999,840 |  |
Common Stock [Member] |  |  |  |
Stock issued for compensation plans, shares (in shares) | [1] | 359,286 | 295,630 | 291,746
Preferred Stock [Member] | Community First Bancshares Inc [Member] |  |  |  |
Stock issued for acquisition, shares (in shares) | [1] |  |  | 30,852
Retained Earnings [Member] |  |  |  |
Cash dividends, per share (in dollars per share) | [1] | $ 0.50 | $ 0.48 | $ 0.46
Stock issued for acquisition, shares (in shares) |  |  |  | 132,000
[1] | All share and per share amounts have been restated to reflect the effect of the two-for-one stock split on February 8, 2018.

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