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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
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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

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