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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands | Common Stock | Retained Earnings Adoption of ASU 2017-08 | Retained Earnings | Accumulated Other Comprehensive Income (Loss) | Treasury Stock | Total Stockholders' Equity Adoption of ASU 2017-08 | Total Stockholders' Equity | Noncontrolling Interest | Adoption of ASU 2017-08 | Total
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2017 | $ 108,862 |  | $ 363,794 | $ (670) | $ (3,408) |  | $ 468,578 | $ 89 |  | $ 468,667
Balance (in shares) at Dec. 31, 2017 | 25,025,933 |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |
Net income |  |  | 80,411 |  |  |  | 80,411 |  |  | 80,411
Other comprehensive income (loss), net of tax |  |  |  | (5,280) |  |  | (5,280) |  |  | (5,280)
Cash dividends declared |  |  | (25,291) |  |  |  | (25,291) |  |  | (25,291)
Treasury shares purchased under deferred directors' plan | $ (463) |  |  |  | 463 |  | 0 |  |  |
Treasury shares purchased under deferred directors' plan (in shares) | (9,625) |  |  |  |  |  |  |  |  |
Treasury shares sold and distributed under deferred directors' plan | $ (115) |  |  |  | 115 |  | 0 |  |  |
Treasury shares sold and distributed under deferred directors' plan (in shares) | 5,636 |  |  |  |  |  |  |  |  |
Stock activity under equity compensation plans | $ 2,435 |  |  |  |  |  | 2,435 |  |  | 2,435
Stock activity under equity compensation plans (in shares) | 106,829 |  |  |  |  |  |  |  |  |
Stock based compensation expense | $ 5,608 |  |  |  |  |  | 5,608 |  |  | 5,608
Balance (Accounting Standards Update 2018-02) at Dec. 31, 2018 |  |  | 173 | (173) |  |  | 0 |  |  |
Balance (Accounting Standards Update 2014-09) at Dec. 31, 2018 |  |  | 24 |  |  |  | 24 |  |  | 24
Balance (Accounting Standards Update 2016-01) at Dec. 31, 2018 |  |  | 68 | (68) |  |  | 0 |  |  |
Balance at Dec. 31, 2018 | $ 112,383 |  | 419,179 | (6,191) | (3,756) |  | 521,615 | 89 |  | 521,704
Balance (in shares) at Dec. 31, 2018 | 25,128,773 |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |
Net income |  |  | 87,047 |  |  |  | 87,047 |  |  | 87,047
Other comprehensive income (loss), net of tax |  |  |  | 18,250 |  |  | 18,250 |  |  | 18,250
Cash dividends declared |  |  | (29,652) |  |  |  | (29,652) |  |  | (29,652)
Cashless exercise of warrants |  |  |  |  |  |  | 0 |  |  |
Cashless exercise of warrants (in shares) | 224,066 |  |  |  |  |  |  |  |  |
Treasury shares purchased under deferred directors' plan | $ (515) |  |  |  | 515 |  | 0 |  |  |
Treasury shares purchased under deferred directors' plan (in shares) | (11,481) |  |  |  |  |  |  |  |  |
Treasury shares sold and distributed under deferred directors' plan | $ (118) |  |  |  | 118 |  | 0 |  |  |
Treasury shares sold and distributed under deferred directors' plan (in shares) | 5,699 |  |  |  |  |  |  |  |  |
Stock activity under equity compensation plans | $ 2,109 |  |  |  |  |  | 2,109 |  |  | 2,109
Stock activity under equity compensation plans (in shares) | 97,218 |  |  |  |  |  |  |  |  |
Stock based compensation expense | $ 4,187 |  |  |  |  |  | 4,187 |  |  | 4,187
Balance (Accounting Standards Update 2016-01) at Dec. 31, 2019 |  | $ (1,327) |  |  |  | $ (1,327) |  |  | $ (1,327) |
Balance at Dec. 31, 2019 | $ 114,858 |  | 475,247 | 12,059 | (4,153) |  | 598,011 | 89 |  | 598,100
Balance (in shares) at Dec. 31, 2019 | 25,444,275 |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |
Cumulative period adjustment made to retained earnings |  |  |  |  |  |  |  |  |  | 475,247
Net income |  |  | 84,337 |  |  |  | 84,337 |  |  | 84,337
Other comprehensive income (loss), net of tax |  |  |  | 15,685 |  |  | 15,685 |  |  | 15,685
Cash dividends declared |  |  | (30,579) |  |  |  | (30,579) |  |  | (30,579)
Treasury shares purchased under share repurchase plan | $ 0 |  |  |  | (10,012) |  | (10,012) |  |  | (10,012)
Treasury shares purchased under share repurchase plan (in shares) | (289,101) |  |  |  |  |  |  |  |  |
Treasury shares purchased under deferred directors' plan | $ (535) |  |  |  | 535 |  | 0 |  |  |
Treasury shares purchased under deferred directors' plan (in shares) | (11,566) |  |  |  |  |  |  |  |  |
Treasury shares sold and distributed under deferred directors' plan | $ (119) |  |  |  | 119 |  | 0 |  |  |
Treasury shares sold and distributed under deferred directors' plan (in shares) | 5,748 |  |  |  |  |  |  |  |  |
Stock activity under equity compensation plans | $ 2,137 |  |  |  |  |  | 2,137 |  |  | 2,137
Stock activity under equity compensation plans (in shares) | 90,392 |  |  |  |  |  |  |  |  |
Stock based compensation expense | $ 1,790 |  |  |  |  |  | 1,790 |  |  | 1,790
Balance at Dec. 31, 2020 | $ 114,927 |  | $ 529,005 | $ 27,744 | $ (14,581) |  | $ 657,095 | $ 89 |  | 657,184
Balance (in shares) at Dec. 31, 2020 | 25,239,748 |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |
Cumulative period adjustment made to retained earnings |  |  |  |  |  |  |  |  |  | $ 529,005

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