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Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands | Total | Common Stock [Member] | Additional paid-in capital [Member] | Retained Earnings [Member] | Accumulated other comprehensive income (loss) [Member] | Treasury stock [Member]
--- | --- | --- | --- | --- | --- | ---
Cumulative effect of new accounting principle in period of adoption | Accounting Standards Update 2016-02 [Member] |  |  |  | $ 342 |  |
Cumulative effect of new accounting principle in period of adoption | Accounting Standards Update 2016-13 [Member] |  |  |  | 0 |  |
Balance at beginning of year, as adjusted |  |  |  | 1,858,756 |  |
Beginning of year at Dec. 31, 2018 |  | $ 205,697 | $ 390,315 | 1,858,414 | $ (77,956) | $ (584,668)
Dividend reinvestment plan |  | 11 | 365 |  |  |
Stock purchase and compensation plans |  | 743 | 8,201 |  |  |
Net income | $ 61,348 |  |  | 61,348 |  |
Dividends to stockholders |  |  |  | (11,985) |  |
Other comprehensive (loss) income | 80,980 |  |  |  | 80,980 |
Acquisition of treasury stock |  |  |  |  |  | (6,585)
End of period at Mar. 31, 2019 | $ 1,925,222 | 206,451 | 398,881 | 1,908,119 | 3,024 | (591,253)
Dividends declared per share to stockholders | $ 0.20 |  |  |  |  |
Common stock, shares outstanding, beginning of period at Dec. 31, 2018 | 58,948,554 |  |  |  |  |
Dividend reinvestment plan, shares | 5,694 |  |  |  |  |
Stock purchase and compensation plan, shares | 371,628 |  |  |  |  |
Acquisition of treasury stock, shares | (102,971) |  |  |  |  |
Common stock, shares outstanding, end of period at Mar. 31, 2019 | 59,222,905 |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption | $ 1,435 |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption | Accounting Standards Update 2016-02 [Member] |  |  |  | 0 |  |
Cumulative effect of new accounting principle in period of adoption | Accounting Standards Update 2016-13 [Member] |  |  |  | 1,435 |  |
Balance at beginning of year, as adjusted |  |  |  | 2,081,964 |  |
Beginning of year at Dec. 31, 2019 | 2,194,936 | 206,968 | 418,521 | 2,080,529 | 81,750 | (592,832)
Dividend reinvestment plan |  | 14 | 408 |  |  |
Stock purchase and compensation plans |  | 683 | 8,399 |  |  |
Net income | 15,236 |  |  | 15,236 |  |
Dividends to stockholders |  |  |  | (13,860) |  |
Other comprehensive (loss) income | (103,867) |  |  |  | (103,867) |
Acquisition of treasury stock |  |  |  |  |  | (6,928)
End of period at Mar. 31, 2020 | $ 2,096,456 | $ 207,665 | $ 427,328 | $ 2,083,340 | $ (22,117) | $ (599,760)
Dividends declared per share to stockholders | $ 0.23 |  |  |  |  |
Common stock, shares outstanding, beginning of period at Dec. 31, 2019 | 59,461,153 |  |  |  |  |
Dividend reinvestment plan, shares | 6,975 |  |  |  |  |
Stock purchase and compensation plan, shares | 341,236 |  |  |  |  |
Acquisition of treasury stock, shares | (101,819) |  |  |  |  |
Common stock, shares outstanding, end of period at Mar. 31, 2020 | 59,707,545 |  |  |  |  |

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