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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) $ in Thousands | Common stock amount | Additional paid-in capital | Retained earnings | Accumulated other comprehensive income (loss) | Treasury stock | Total
--- | --- | --- | --- | --- | --- | ---
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Modified retrospective basis adoption of Revenue Recognition Accounting Codification Standard 606 |  |  | $ (184) |  |  | $ (184)
Balance at beginning of period at Dec. 31, 2017 | $ 32,857 | $ 186,702 | 144,977 | $ (4,554) | $ (5,341) | 354,641
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income |  |  | 32,937 |  |  | 32,937
Other comprehensive income |  |  |  | (6,268) |  | (6,268)
Cash dividends declared |  |  | (12,184) |  |  | (12,184)
Treasury stock purchased |  |  |  |  | (324) | (324)
Net issuance to employee stock plans, including related tax effects |  | (395) |  |  | 1,010 | 615
Reclassification of the income tax effects of the Tax Cuts and Jobs Act from accumulated other comprehensive income for adoption of ASU 2018-02 |  |  | 980 | (980) |  |
Recognition of stock based compensation |  | 1,346 |  |  |  | 1,346
Balance at end of period at Dec. 31, 2018 | 32,857 | 187,653 | 166,526 | (11,802) | (4,655) | 370,579
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income |  |  | 22,620 |  |  | 22,620
Other comprehensive income |  |  |  | 15,713 |  | 15,713
Cash dividends declared |  |  | (13,366) |  |  | (13,366)
Treasury stock purchased |  |  |  |  | (239) | (239)
Net issuance to employee stock plans, including related tax effects |  | (490) |  |  | 217 | (273)
Recognition of stock based compensation |  | 1,373 |  |  |  | 1,373
Balance at end of period at Dec. 31, 2019 | 32,857 | 188,536 | 175,780 | 3,911 | (4,677) | 396,407
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income |  |  | 33,244 |  |  | 33,244
Other comprehensive income |  |  |  | 7,105 |  | 7,105
Cash dividends declared |  |  | (13,417) |  |  | (13,417)
Treasury stock purchased |  |  |  |  | (14,188) | (14,188)
Net issuance to employee stock plans, including related tax effects |  | (22) |  |  | 642 | 620
Recognition of stock based compensation |  | 1,570 |  |  |  | 1,570
Balance at end of period at Dec. 31, 2020 | $ 32,857 | $ 190,084 | $ 195,607 | $ 11,016 | $ (18,223) | $ 411,341

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