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Consolidated Statements of Stockholders' Equity (Parentheticals) - $ / shares	12 Months Ended
	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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Aggregate dividends declared during the period for each share of common stock outstanding.

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