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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 (loss) income [Member] | Treasury stock [Member]
--- | --- | --- | --- | --- | --- | ---
Cumulative effect adjustment | Accounting Standards Update 2016-01 [Member] |  |  |  | $ 0 | $ 0 |
Cumulative effect adjustment | Accounting Standards Update 2018-02 [Member] |  |  |  | 0 | 0 |
Cumulative effect adjustment | Accounting Standards Update 2016-02 [Member] |  |  |  | 0 |  |
Balance at beginning of year, as adjusted |  |  |  | 1,568,881 | (15,950) |
Beginning of year at Dec. 31, 2016 |  | $ 203,241 | $ 347,295 | 1,568,881 | (15,950) | $ (572,097)
Dividend reinvestment plan |  | 57 | 1,395 |  |  |
Stock purchase and compensation plans |  | 1,271 | 19,027 |  |  |
Net income | $ 168,826 |  |  | 168,826 |  |
Dividends to stockholders |  |  |  | (39,094) |  |
Other comprehensive income (loss) | $ 36,120 |  |  |  | 36,120 |
Acquisition of treasury stock |  |  |  |  |  | (6,015)
Dividends declared per share to stockholders | $ 0.66 |  |  |  |  |
End of year at Dec. 31, 2017 | $ 1,712,957 | 204,569 | 367,717 | 1,698,613 | 20,170 | (578,112)
Common Stock, shares outstanding, beginning of period at Dec. 31, 2016 | 57,967,199 |  |  |  |  |
Dividend reinvestment plan | 28,607 |  |  |  |  |
Stock purchase and compensation plan | 635,521 |  |  |  |  |
Acquisition of treasury stock | (136,205) |  |  |  |  |
Common Stock, shares outstanding, end of period at Dec. 31, 2017 | 58,495,122 |  |  |  |  |
Cumulative effect adjustment | $ (25,000) |  |  |  | 25,019 |
Cumulative effect adjustment | Accounting Standards Update 2016-01 [Member] | 0 |  |  | 30,726 | (30,726) |
Cumulative effect adjustment | Accounting Standards Update 2018-02 [Member] |  |  |  | (5,707) | 5,707 |
Cumulative effect adjustment | Accounting Standards Update 2016-02 [Member] |  |  |  | 0 |  |
Balance at beginning of year, as adjusted |  |  |  | 1,723,632 | (4,849) |
Dividend reinvestment plan |  | 47 | 1,379 |  |  |
Stock purchase and compensation plans |  | 1,081 | 21,219 |  |  |
Net income | 178,939 |  |  | 178,939 |  |
Dividends to stockholders |  |  |  | (44,157) |  |
Other comprehensive income (loss) | $ (73,107) |  |  |  | (73,107) |
Acquisition of treasury stock |  |  |  |  |  | (6,556)
Dividends declared per share to stockholders | $ 0.74 |  |  |  |  |
End of year at Dec. 31, 2018 | $ 1,791,802 | 205,697 | 390,315 | 1,858,414 | (77,956) | (584,668)
Dividend reinvestment plan | 23,493 |  |  |  |  |
Stock purchase and compensation plan | 540,337 |  |  |  |  |
Acquisition of treasury stock | (110,398) |  |  |  |  |
Common Stock, shares outstanding, end of period at Dec. 31, 2018 | 58,948,554 |  |  |  |  |
Cumulative effect adjustment | Accounting Standards Update 2016-01 [Member] | $ 30,726 |  |  | 0 | 0 |
Cumulative effect adjustment | Accounting Standards Update 2018-02 [Member] |  |  |  | 0 | 0 |
Balance at beginning of year, as adjusted |  |  |  | 1,858,756 | (77,956) |
Dividend reinvestment plan |  | 44 | 1,510 |  |  |
Stock purchase and compensation plans |  | 1,227 | 26,696 |  |  |
Net income | 271,623 |  |  | 271,623 |  |
Dividends to stockholders |  |  |  | (49,850) |  |
Other comprehensive income (loss) | $ 159,706 |  |  |  | 159,706 |
Acquisition of treasury stock |  |  |  |  |  | (8,164)
Dividends declared per share to stockholders | $ 0.83 |  |  |  |  |
End of year at Dec. 31, 2019 | $ 2,194,936 | $ 206,968 | $ 418,521 | $ 2,080,529 | $ 81,750 | $ (592,832)
Dividend reinvestment plan | 22,087 |  |  |  |  |
Stock purchase and compensation plan | 613,678 |  |  |  |  |
Acquisition of treasury stock | (123,166) |  |  |  |  |
Common Stock, shares outstanding, end of period at Dec. 31, 2019 | 59,461,153 |  |  |  |  |
Cumulative effect adjustment | Accounting Standards Update 2016-01 [Member] | $ 0 |  |  |  |  |

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