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Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands | 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] | Preferred Stock [Member] | Common Stock [Member] | Additional Paid-in Capital [Member] | AOCI Attributable to Parent [Member] | Retained Earnings [Member] | Total
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2015 |  |  |  |  |  |  | $ 30,852 | $ 303 | $ 662,378 | $ (2,665) | $ 385,987 | $ 1,076,855
Comprehensive income |  |  |  |  |  |  |  |  |  | 4,782 | 69,843 | 74,625
Stock issued for employee stock purchase plan |  |  |  |  |  |  |  |  | 586 |  |  | 586
Stock-based compensation plans, net |  |  |  |  |  |  |  | 2 | 5,924 |  |  | 5,926
Stock issued for acquisition | $ 8 | $ 41,244 | $ 41,252 |  |  |  |  |  |  |  |  |
Preferred stock redeemed |  |  |  |  |  |  | $ (30,852) |  |  |  |  | (30,852)
Dividends on preferred stock |  |  |  |  |  |  |  |  |  |  | (24) | (24)
Dividends on common stock |  |  |  |  |  |  |  |  |  |  | (21,227) | (21,227)
Balance at Sep. 30, 2016 |  |  |  |  |  |  |  | 313 | 710,132 | 2,117 | 434,579 | 1,147,141
Comprehensive income |  |  |  |  |  |  |  |  |  | (17,329) | 26,971 | 9,642
Stock-based compensation plans, net |  |  |  |  |  |  |  |  | 1,844 |  |  | 1,844
Cash dividends |  |  |  |  |  |  |  |  |  |  | (7,516) | (7,516)
Balance at Dec. 31, 2016 |  |  |  |  |  |  |  | 313 | 711,976 | (15,212) | 454,034 | 1,151,111
Comprehensive income |  |  |  |  |  |  |  |  |  | 4,561 | 74,037 | 78,598
Stock issued for employee stock purchase plan |  |  |  |  |  |  |  |  | 618 |  |  | 618
Stock-based compensation plans, net |  |  |  |  |  |  |  | 1 | 8,219 |  |  | 8,220
Stock issued for acquisition |  |  |  | $ 8 | $ 42,630 | $ 42,638 |  |  |  |  |  |
Dividends on common stock |  |  |  |  |  |  |  |  |  |  | (23,986) | (23,986)
Balance at Sep. 30, 2017 |  |  |  |  |  |  |  | $ 322 | $ 763,443 | $ (10,651) | $ 504,085 | $ 1,257,199

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