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Consolidated Statements of Stockholders' Equity (Parentheticals) - $ / shares | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Additional Paid-in Capital [Member] | Citizens National Bank [Member] |  |  |
Stock issued for acquisition, shares (in shares) | 835,741 |  |
Additional Paid-in Capital [Member] |  |  |
Stock issued for employee stock purchase plan, shares (in shares) | 15,735 | 6,528 | 4,897
Stock issued for employee stock purchase plan, shares (in shares) | 15,735 | 6,528 | 4,897
Common Stock [Member] | Delta Trust [Member] |  |  |
Stock issued for acquisition, shares (in shares) |  |  | 1,629,515
Common Stock [Member] | Community First Bancshares Inc [Member] |  |  |
Stock issued for acquisition, shares (in shares) |  | 6,552,915 |
Common Stock [Member] | Liberty Bancshares, Inc. [Member] |  |  |
Stock issued for acquisition, shares (in shares) |  | 5,181,337 |
Common Stock [Member] | Ozark Trust [Member] |  |  |
Stock issued for acquisition, shares (in shares) |  | 339,290 |
Common Stock [Member] |  |  |
Stock issued for compensation plans, shares (in shares) |  | 145,874 | 191,820
Stock issued for compensation plans, shares (in shares) |  | 145,874 | 191,820
Retained Earnings [Member] |  |  |
Cash dividends, per share (in dollars per share) | $ 0.96 | $ 0.92 | $ 0.88
Cash dividends, per share (in dollars per share) | $ 0.96 | $ 0.92 | $ 0.88
Preferred Stock [Member] | Community First Bancshares Inc [Member] |  |  |
Stock issued for acquisition, shares (in shares) |  | 30,852 |
Stock issued for compensation plans, shares (in shares) | 147,815 |  |
Stock issued for acquisition, shares (in shares) |  | 66,000 |
Stock issued for compensation plans, shares (in shares) | 147,815 |  |

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