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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS’ EQUITY - USD ($)
$ in Thousands
Voting
Common Stock
Series A Nonvoting
Common Stock
Surplus
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Treasury Stock
Total
Balance at Dec. 31, 2017 $ 3 $ 178 $ 32,288 $ 293,934 $ (375) $ (2,112) $ 323,916
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income       51,879     51,879
Other comprehensive income (loss)         (13,262)   (13,262)
Repurchase of common stock -Series A (43,180 shares)           (907) (907)
Cash dividends       (31,769)     (31,769)
Balance at Sep. 30, 2018 3 178 32,288 314,166 (13,759) (3,019) 329,857
Balance at Jun. 30, 2018 3 178 32,288 305,730 (10,150) (3,019) 325,030
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income       17,592     17,592
Other comprehensive income (loss)         (3,609)   (3,609)
Cash dividends       (9,156)     (9,156)
Balance at Sep. 30, 2018 3 178 32,288 314,166 (13,759) (3,019) 329,857
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Adoption of ASU 2016-01       122 (122)   (122)
Balance at Dec. 31, 2018 3 178 32,288 315,234 (4,288) (3,019) 340,396
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income       50,778     50,778
Other comprehensive income (loss)         12,719   12,719
Cash dividends       (54,957)     (54,957)
Balance at Sep. 30, 2019 3 178 32,288 311,055 8,431 (3,019) 348,936
Balance at Jun. 30, 2019 3 178 32,288 302,984 7,436 (3,019) 339,870
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income       17,437     17,437
Other comprehensive income (loss)         995   995
Cash dividends       (9,366)     (9,366)
Balance at Sep. 30, 2019 $ 3 $ 178 $ 32,288 $ 311,055 $ 8,431 $ (3,019) $ 348,936