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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