XML 28 R8.htm IDEA: XBRL DOCUMENT v3.8.0.1
Consolidated Statements of Stockholders' Equity (Parentheticals) - $ / shares
 12 Months Ended
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.