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Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands | Total | Preferred Stock [Member] | Common Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | AOCI Attributable to Parent [Member] | Treasury Stock [Member]
--- | --- | --- | --- | --- | --- | --- | ---
Cumulative effect of new accounting principle in period of adoption | $ (2,285) |  |  |  | $ (2,285) |  |
Total shareholders’ equity at beginning of period at Dec. 31, 2017 | 3,297,863 | $ 144,486 | $ 642 | $ 953,361 | 2,187,069 | $ 79,512 | $ (67,207)
Total shareholders' equity at beginning of period, as adjusted at Dec. 31, 2017 | 3,295,578 | 144,486 | 642 | 953,361 | 2,184,784 | 79,512 | (67,207)
Net income | 335,665 |  |  |  | 335,665 |  |
Other comprehensive income (loss) | (230,282) |  |  |  |  | (230,282) |
Reclassification of certain income tax effects related to U.S. statutory federal income tax rate under the Tax Cuts and Jobs Act |  |  |  |  | (9,535) | 9,535 |
Stock option exercises/stock unit conversions (101,284 shares QTD and 255,184 shares YTD in 2019 and 19,232 shares QTD and 447,831 shares YTD in 2018) | 26,567 |  |  |  | (12,887) |  | 39,454
Stock compensation expense recognized in earnings | 9,556 |  |  | 9,556 |  |  |
Purchase of treasury stock (202,724 shares QTD and 704,382 shares YTD in 2019 and 0 shares QTD and 601 shares YTD in 2018) | (70) |  |  |  |  |  | (70)
Cash dividends – preferred stock (approximately $0.34 per share QTD and $1.01 per share YTD in both 2019 and in 2018) | (6,047) |  |  |  | (6,047) |  |
Cash dividends – common stock ($0.71 per share QTD and $2.09 per share YTD in 2019 and $0.67 per share QTD and $1.91 per share YTD in 2018) | (122,721) |  |  |  | (122,721) |  |
Total shareholders’ equity at end of period at Sep. 30, 2018 | 3,308,246 | 144,486 | 642 | 962,917 | 2,369,259 | (141,235) | (27,823)
Total shareholders’ equity at beginning of period at Jun. 30, 2018 | 3,309,512 | 144,486 | 642 | 960,121 | 2,297,099 | (63,319) | (29,517)
Net income | 117,844 |  |  |  | 117,844 |  |
Other comprehensive income (loss) | (77,916) |  |  |  |  | (77,916) |
Stock option exercises/stock unit conversions (101,284 shares QTD and 255,184 shares YTD in 2019 and 19,232 shares QTD and 447,831 shares YTD in 2018) | 1,119 |  |  |  | (575) |  | 1,694
Stock compensation expense recognized in earnings | 2,796 |  |  | 2,796 |  |  |
Cash dividends – preferred stock (approximately $0.34 per share QTD and $1.01 per share YTD in both 2019 and in 2018) | (2,016) |  |  |  | (2,016) |  |
Cash dividends – common stock ($0.71 per share QTD and $2.09 per share YTD in 2019 and $0.67 per share QTD and $1.91 per share YTD in 2018) | (43,093) |  |  |  | (43,093) |  |
Total shareholders’ equity at end of period at Sep. 30, 2018 | 3,308,246 | 144,486 | 642 | 962,917 | 2,369,259 | (141,235) | (27,823)
Total shareholders’ equity at end of period at Dec. 31, 2018 | 3,368,917 | 144,486 | 642 | 967,304 | 2,440,002 | (63,600) | (119,917)
Cumulative effect of new accounting principle in period of adoption | (14,672) |  |  |  | (14,672) |  |
Total shareholders' equity at beginning of period, as adjusted at Dec. 31, 2018 | 3,354,245 | 144,486 | 642 | 967,304 | 2,425,330 | (63,600) | (119,917)
Net income | 339,918 |  |  |  | 339,918 |  |
Other comprehensive income (loss) | 368,983 |  |  |  |  | 368,983 |
Stock option exercises/stock unit conversions (101,284 shares QTD and 255,184 shares YTD in 2019 and 19,232 shares QTD and 447,831 shares YTD in 2018) | 13,506 |  |  |  | (9,569) |  | 23,075
Stock compensation expense recognized in earnings | 10,693 |  |  | 10,693 |  |  |
Purchase of treasury stock (202,724 shares QTD and 704,382 shares YTD in 2019 and 0 shares QTD and 601 shares YTD in 2018) | (67,709) |  |  |  |  |  | (67,709)
Cash dividends – preferred stock (approximately $0.34 per share QTD and $1.01 per share YTD in both 2019 and in 2018) | (6,047) |  |  |  | (6,047) |  |
Cash dividends – common stock ($0.71 per share QTD and $2.09 per share YTD in 2019 and $0.67 per share QTD and $1.91 per share YTD in 2018) | (132,132) |  |  |  | (132,132) |  |
Total shareholders’ equity at end of period at Sep. 30, 2019 | 3,881,457 | 144,486 | 642 | 977,997 | 2,617,500 | 305,383 | (164,551)
Total shareholders’ equity at beginning of period at Jun. 30, 2019 | 3,739,246 | 144,486 | 642 | 975,322 | 2,556,235 | 219,438 | (156,877)
Net income | 111,836 |  |  |  | 111,836 |  |
Other comprehensive income (loss) | 85,945 |  |  |  |  | 85,945 |
Stock option exercises/stock unit conversions (101,284 shares QTD and 255,184 shares YTD in 2019 and 19,232 shares QTD and 447,831 shares YTD in 2018) | 5,665 |  |  |  | (3,851) |  | 9,516
Stock compensation expense recognized in earnings | 2,675 |  |  | 2,675 |  |  |
Purchase of treasury stock (202,724 shares QTD and 704,382 shares YTD in 2019 and 0 shares QTD and 601 shares YTD in 2018) | (17,190) |  |  |  |  |  | (17,190)
Cash dividends – preferred stock (approximately $0.34 per share QTD and $1.01 per share YTD in both 2019 and in 2018) | (2,016) |  |  |  | (2,016) |  |
Cash dividends – common stock ($0.71 per share QTD and $2.09 per share YTD in 2019 and $0.67 per share QTD and $1.91 per share YTD in 2018) | (44,704) |  |  |  | (44,704) |  |
Total shareholders’ equity at end of period at Sep. 30, 2019 | $ 3,881,457 | $ 144,486 | $ 642 | $ 977,997 | $ 2,617,500 | $ 305,383 | $ (164,551)

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