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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands | Total | Common Stock [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Treasury Stock [Member]
--- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2015 | $ 392,812 | $ 99,123 | $ 294,002 | $ 2,142 | $ (2,455)
Balance (in shares) at Dec. 31, 2015 |  | 24,819,066 |  |  |
Net income | 52,084 |  | 52,084 |  |
Other comprehensive income (loss), net of tax | (4,529) |  |  | (4,529) |
Comprehensive income (loss) | 47,555 |  |  |  |
Cash dividends declared | (18,213) |  | (18,213) |  |
Treasury shares purchased under deferred directors' plan | 0 | $ 458 |  |  | (458)
Treasury shares purchased under deferred directors' plan (in shares) |  | (14,811) |  |  |
Stock activity under equity incentive plans | 614 | $ 614 |  |  |
Stock activity under equity incentive plans (in shares) |  | 133,646 |  |  |
Stock based compensation expense | 4,210 | $ 4,210 |  |  |
Fractional shares retired due to 3-for-2 stock split (in shares) |  | (36) |  |  |
Balance at Dec. 31, 2016 | 426,978 | $ 104,405 | 327,873 | (2,387) | (2,913)
Balance (in shares) at Dec. 31, 2016 |  | 24,937,865 |  |  |
Net income | 57,330 |  | 57,330 |  |
Other comprehensive income (loss), net of tax | 1,717 |  |  | 1,717 |
Comprehensive income (loss) | 59,047 |  |  |  |
Cash dividends declared | (21,409) |  | (21,409) |  |
Treasury shares purchased under deferred directors' plan | 0 | $ 495 |  |  | (495)
Treasury shares purchased under deferred directors' plan (in shares) |  | (10,748) |  |  |
Stock activity under equity incentive plans | (1,736) | $ (1,736) |  |  |
Stock activity under equity incentive plans (in shares) |  | 98,816 |  |  |
Stock based compensation expense | 5,698 | $ 5,698 |  |  |
Balance at Dec. 31, 2017 | 468,578 | $ 108,862 | 363,794 | (670) | (3,408)
Balance (in shares) at Dec. 31, 2017 |  | 25,025,933 |  |  |
Adoption of ASU | Accounting Standards Update 2018-02 [Member] | 0 |  | 173 | (173) |
Adoption of ASU | Accounting Standards Update 2014-09 [Member] | 24 |  | 24 |  |
Adoption of ASU | Accounting Standards Update 2016-01 [Member] | 0 |  | 68 | (68) |
Net income | 80,411 |  | 80,411 |  |
Other comprehensive income (loss), net of tax | (5,280) |  |  | (5,280) |
Comprehensive income (loss) | 75,131 |  |  |  |
Cash dividends declared | (25,291) |  | (25,291) |  |
Treasury shares purchased under deferred directors' plan | 0 | $ 463 |  |  | (463)
Treasury shares purchased under deferred directors' plan (in shares) |  | (9,625) |  |  |
Treasury shares sold and distributed under deferred directors' plan | 0 | $ (115) |  |  | 115
Treasury shares sold and distributed under deferred directors' plan (in shares) |  | 5,636 |  |  |
Stock activity under equity incentive plans | (2,435) | $ (2,435) |  |  |
Stock activity under equity incentive plans (in shares) |  | 106,829 |  |  |
Stock based compensation expense | 5,608 | $ 5,608 |  |  |
Balance at Dec. 31, 2018 | $ 521,615 | $ 112,383 | $ 419,179 | $ (6,191) | $ (3,756)
Balance (in shares) at Dec. 31, 2018 |  | 25,128,773 |  |  |

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