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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 2016-01 [Member] |  |  |  | $ 30,726 | $ (30,726) |
Cumulative effect of new accounting principle in period of adoption | Accounting Standards Update 2018-02 [Member] |  |  |  | (5,707) | 5,707 |
Cumulative effect of new accounting principle in period of adoption | Accounting Standards Update 2016-02 [Member] |  |  |  | 0 |  |
Balance at beginning of year, as adjusted |  |  |  | 1,723,632 | (4,849) |
Beginning of year at Dec. 31, 2017 |  | $ 204,569 | $ 367,717 | 1,698,613 | 20,170 | $ (578,112)
Dividend reinvestment plan |  | 35 | 1,013 |  |  |
Stock purchase and compensation plans |  | 969 | 16,721 |  |  |
Net income | $ 133,179 |  |  | 133,179 |  |
Dividends to stockholders |  |  |  | (32,204) |  |
Other comprehensive income (loss) | (87,727) |  |  |  | (87,727) |
Acquisition of treasury stock |  |  |  |  |  | (6,423)
End of period at Sep. 30, 2018 | $ 1,738,520 | 205,573 | 385,451 | 1,824,607 | (92,576) | (584,535)
Dividends declared per share to stockholders | $ 0.54 |  |  |  |  |
Common stock, shares outstanding, beginning of period at Dec. 31, 2017 | 58,495,122 |  |  |  |  |
Dividend reinvestment plan, shares | 17,683 |  |  |  |  |
Stock purchase and compensation plan, shares | 484,491 |  |  |  |  |
Acquisition of treasury stock, shares | (108,311) |  |  |  |  |
Common stock, shares outstanding, end of period at Sep. 30, 2018 | 58,888,985 |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption | Accounting Standards Update 2016-01 [Member] |  |  |  | 0 | 0 |
Cumulative effect of new accounting principle in period of adoption | Accounting Standards Update 2018-02 [Member] |  |  |  | 0 | 0 |
Cumulative effect of new accounting principle in period of adoption | Accounting Standards Update 2016-02 [Member] |  |  |  | 0 |  |
Balance at beginning of year, as adjusted |  |  |  | 1,779,928 | (84,517) |
Beginning of year at Jun. 30, 2018 |  | 205,460 | 381,641 | 1,779,928 | (84,517) | (584,357)
Dividend reinvestment plan |  | 10 | 327 |  |  |
Stock purchase and compensation plans |  | 103 | 3,483 |  |  |
Net income | $ 55,435 |  |  | 55,435 |  |
Dividends to stockholders |  |  |  | (10,756) |  |
Other comprehensive income (loss) | (8,059) |  |  |  | (8,059) |
Acquisition of treasury stock |  |  |  |  |  | (178)
End of period at Sep. 30, 2018 | $ 1,738,520 | 205,573 | 385,451 | 1,824,607 | (92,576) | (584,535)
Dividends declared per share to stockholders | $ 0.18 |  |  |  |  |
Common stock, shares outstanding, beginning of period at Jun. 30, 2018 | 58,835,052 |  |  |  |  |
Dividend reinvestment plan, shares | 5,310 |  |  |  |  |
Stock purchase and compensation plan, shares | 51,482 |  |  |  |  |
Acquisition of treasury stock, shares | (2,859) |  |  |  |  |
Common stock, shares outstanding, end of period at Sep. 30, 2018 | 58,888,985 |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption | Accounting Standards Update 2016-01 [Member] |  |  |  | 0 | 0 |
Cumulative effect of new accounting principle in period of adoption | Accounting Standards Update 2018-02 [Member] |  |  |  | 0 | 0 |
Cumulative effect of new accounting principle in period of adoption | Accounting Standards Update 2016-02 [Member] |  |  |  | 342 |  |
Balance at beginning of year, as adjusted |  |  |  | 1,858,756 | (77,956) |
Beginning of year at Dec. 31, 2018 | $ 1,791,802 | 205,697 | 390,315 | 1,858,414 | (77,956) | (584,668)
Dividend reinvestment plan |  | 31 | 1,095 |  |  |
Stock purchase and compensation plans |  | 1,115 | 20,937 |  |  |
Net income | 189,764 |  |  | 189,764 |  |
Dividends to stockholders |  |  |  | (36,021) |  |
Other comprehensive income (loss) | 176,382 |  |  |  | 176,382 |
Acquisition of treasury stock |  |  |  |  |  | (8,071)
End of period at Sep. 30, 2019 | $ 2,137,376 | 206,843 | 412,347 | 2,012,499 | 98,426 | (592,739)
Dividends declared per share to stockholders | $ 0.60 |  |  |  |  |
Common stock, shares outstanding, beginning of period at Dec. 31, 2018 | 58,948,554 |  |  |  |  |
Dividend reinvestment plan, shares | 15,650 |  |  |  |  |
Stock purchase and compensation plan, shares | 557,257 |  |  |  |  |
Acquisition of treasury stock, shares | (121,892) |  |  |  |  |
Common stock, shares outstanding, end of period at Sep. 30, 2019 | 59,399,569 |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption | Accounting Standards Update 2016-01 [Member] |  |  |  | 0 | 0 |
Cumulative effect of new accounting principle in period of adoption | Accounting Standards Update 2018-02 [Member] |  |  |  | 0 | 0 |
Balance at beginning of year, as adjusted |  |  |  | 1,968,374 | 68,506 |
Beginning of year at Jun. 30, 2019 |  | 206,665 | 407,382 | 1,968,374 | 68,506 | (591,383)
Dividend reinvestment plan |  | 9 | 366 |  |  |
Stock purchase and compensation plans |  | 169 | 4,599 |  |  |
Net income | $ 56,150 |  |  | 56,150 |  |
Dividends to stockholders |  |  |  | (12,025) |  |
Other comprehensive income (loss) | 29,920 |  |  |  | 29,920 |
Acquisition of treasury stock |  |  |  |  |  | (1,356)
End of period at Sep. 30, 2019 | $ 2,137,376 | $ 206,843 | $ 412,347 | 2,012,499 | $ 98,426 | $ (592,739)
Dividends declared per share to stockholders | $ 0.20 |  |  |  |  |
Common stock, shares outstanding, beginning of period at Jun. 30, 2019 | 59,328,108 |  |  |  |  |
Dividend reinvestment plan, shares | 4,738 |  |  |  |  |
Stock purchase and compensation plan, shares | 83,979 |  |  |  |  |
Acquisition of treasury stock, shares | (17,256) |  |  |  |  |
Common stock, shares outstanding, end of period at Sep. 30, 2019 | 59,399,569 |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption | Accounting Standards Update 2016-02 [Member] |  |  |  | $ 0 |  |

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