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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
Cumulative Effect, Period of Adoption, Adjustment [Member]
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Cumulative Effect, Period of Adoption, Adjustment [Member]
Accumulated Other Comprehensive Income (Loss)
Treasury Stock
Total
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Adoption of ASU 2016-01 $ 3 $ 178 $ 32,288   $ 293,934   $ (375) $ (2,112) $ 323,916
Balance at Dec. 31, 2017 3 178 32,288   293,934   (375) (2,112) 323,916
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Adoption of ASU 2016-01 3 178 32,288 $ 122 315,234 $ (122) (4,288) (3,019) 340,396
Net income         63,799       63,799
Other comprehensive income             (3,791)   (3,791)
Cash dividends         (42,621)       (42,621)
Repurchase of common stock -Series A (43,180 shares)               (907) (907)
Balance at Dec. 31, 2018 3 178 32,288 122 315,234 (122) (4,288) (3,019) 340,396
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Adoption of ASU 2016-01 3 178 32,288 122 315,234 (122) (4,288) (3,019) 340,396
Adoption of ASU 2016-01 275 178 190,524 $ 122 134,287 $ (122) 7,832 (3,019) 332,918
Net income         66,865       66,865
Other comprehensive income             12,120   12,120
Cash dividends         (224,956)       (224,956)
Reclassification of undistributed S-Corp earnings     20,472   (20,472)        
Issuance of common stock, net of issuance costs 95   138,398           138,493
Conversion of common stock 178 $ (178)              
Cancelation of treasury stock (1)   (634)   (2,384)     $ 3,019  
Balance at Dec. 31, 2019 275   190,524   134,287   7,832   332,918
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Adoption of ASU 2016-01 275   190,524   134,287   7,832   332,918
Adoption of ASU 2016-01 275   190,875   154,614   18,153   363,917
Net income         36,845       36,845
Other comprehensive income             10,321   10,321
Cash dividends         (16,474)       (16,474)
Reclassification of undistributed S-Corp earnings     351           351
Restricted stock unit cash dividend equivalents         (44)       (44)
Balance at Dec. 31, 2020 275   190,875   154,614   18,153   363,917
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Adoption of ASU 2016-01 $ 275   $ 190,875   $ 154,614   $ 18,153   $ 363,917