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Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands | Delta Trust [Member] Common Stock [Member] | Delta Trust [Member] Additional Paid-in Capital [Member] | Delta Trust [Member] | 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] | Preferred Stock [Member] | Common Stock [Member] | Additional Paid-in Capital [Member] | AOCI Attributable to Parent [Member] | Retained Earnings [Member] | Total
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 162 | $ 88,095 | $ (3,002) | $ 318,577 | $ 403,832
Comprehensive income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,666 | 35,688 | 37,354
Stock issued for employee stock purchase plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 118 |  |  | 118
Stock-based compensation plans, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 | 3,325 |  |  | 3,328
Stock issued for acquisition | $ 16 | $ 65,030 | $ 65,046 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (15,359) | (15,359)
Balance at Dec. 31, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 181 | 156,568 | (1,336) | 338,906 | 494,319
Cash dividends |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (15,359) | (15,359)
Stock issued for employee stock purchase plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 118 |  |  | 118
Stock-based compensation plans, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 | 3,325 |  |  | 3,328
Comprehensive income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,329) | 74,364 | 73,035
Stock issued for employee stock purchase plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 226 |  |  | 226
Stock-based compensation plans, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 | 7,319 |  |  | 7,321
Stock issued for acquisition |  |  |  | $ 30,852 | $ 65 | $ 268,277 | $ 299,194 | $ 52 | $ 212,124 | $ 212,176 | $ 3 | $ 17,864 | $ 17,867 |  |  |  |  |  |  |  |  |
Cash dividends |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (27,026) | (27,026)
Balance at Dec. 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 30,852 | 303 | 662,378 | (2,665) | 385,987 | 1,076,855
Dividends on preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (257) | (257)
Cash dividends |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (27,026) | (27,026)
Stock issued for employee stock purchase plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 226 |  |  | 226
Stock-based compensation plans, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 | 7,319 |  |  | 7,321
Comprehensive income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (12,547) | 96,814 | 84,267
Stock issued for employee stock purchase plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 586 |  |  | 586
Stock-based compensation plans, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 | 7,768 |  |  | 7,770
Stock issued for acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 8 | $ 41,244 | $ 41,252 |  |  |  |  |  |
Balance at Dec. 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 313 | 711,976 | $ (15,212) | 454,034 | 1,151,111
Dividends on preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (24) | (24)
Stock issued for employee stock purchase plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 586 |  |  | 586
Stock-based compensation plans, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2 | $ 7,768 |  |  | 7,770
Preferred stock redeemed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (30,852) |  |  |  |  | (30,852)
Dividends on common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (28,743) | $ (28,743)

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