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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Community First Bancshares Inc [Member]
Preferred Stock [Member]
Community First Bancshares Inc [Member]
Common Stock [Member]
Community First Bancshares Inc [Member]
Additional Paid-in Capital [Member]
Community First Bancshares Inc [Member]
Liberty Bancshares, Inc. [Member]
Common Stock [Member]
Liberty Bancshares, Inc. [Member]
Additional Paid-in Capital [Member]
Liberty Bancshares, Inc. [Member]
Ozark Trust [Member]
Common Stock [Member]
Ozark Trust [Member]
Additional Paid-in Capital [Member]
Ozark Trust [Member]
Citizens National Bank [Member]
Common Stock [Member]
Citizens National Bank [Member]
Additional Paid-in Capital [Member]
Citizens National Bank [Member]
Hardeman County Investment Company, Inc. [Member]
Common Stock [Member]
Hardeman County Investment Company, Inc. [Member]
Additional Paid-in Capital [Member]
Hardeman County Investment Company, Inc. [Member]
OKSB Merger [Member]
Common Stock [Member]
OKSB Merger [Member]
Additional Paid-in Capital [Member]
OKSB Merger [Member]
First Texas Merger [Member]
Common Stock [Member]
First Texas Merger [Member]
Additional Paid-in Capital [Member]
First Texas Merger [Member]
Preferred Stock [Member]
Common Stock [Member]
Additional Paid-in Capital [Member]
AOCI Attributable to Parent [Member]
Retained Earnings [Member]
Total
Balance at Dec. 31, 2014                                               $ 361 $ 156,388 $ (1,336) $ 338,906 $ 494,319
Comprehensive income                                                   (1,329) 74,364 73,035
Stock issued for employee stock purchase plan                                                 226     226
Stock-based compensation plans, net                                               3 7,318     7,321
Stock issued for acquisition $ 30,852 $ 131 $ 268,211 $ 299,194 $ 104 $ 212,072 $ 212,176 $ 7 $ 17,860 $ 17,867                                    
Dividends on preferred stock                                                     (257) (257)
Cash dividends                                                     (27,026) (27,026)
Balance at Dec. 31, 2015                                             $ 30,852 606 662,075 (2,665) 385,987 1,076,855
Comprehensive income                                                   (12,547) 96,814 84,267
Stock issued for employee stock purchase plan                                                 586     586
Stock-based compensation plans, net                                               3 7,767     7,770
Stock issued for acquisition                     $ 17 $ 41,235 $ 41,252                              
Dividends on preferred stock                                                     (24) (24)
Preferred stock redeemed                                             $ (30,852)         (30,852)
Dividends on common stock                                                     (28,743) (28,743)
Balance at Dec. 31, 2016                                               626 711,663 (15,212) 454,034 1,151,111
Comprehensive income                                                   964 92,940 93,904
Stock issued for employee stock purchase plan                                                 618     618
Stock-based compensation plans, net                                               3 12,938     12,941
Stock issued for acquisition                           $ 16 $ 42,622 $ 42,638 $ 145 $ 431,253 $ 431,398 $ 130 $ 386,940 $ 387,070            
Dividends on common stock                                                     (35,116) (35,116)
Reclassify stranded tax effects due to 2017 tax law changes                                                   (3,016) 3,016
Balance at Dec. 31, 2017                                               $ 920 $ 1,586,034 $ (17,264) $ 514,874 $ 2,084,564