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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 | 217,821 |  |  |  | 217,821 |  |
Other comprehensive income (loss) | (152,366) |  |  |  |  | (152,366) |
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 (53,035 shares QTD and 153,900 shares YTD in 2019 and 110,489 shares QTD and 428,599 shares YTD in 2018) | 25,448 |  |  |  | (12,312) |  | 37,760
Stock compensation expense recognized in earnings | 6,760 |  |  | 6,760 |  |  |
Purchase of treasury stock (496,307 shares QTD and 501,658 shares YTD in 2019 and 601 shares both QTD and YTD in 2018) | (70) |  |  |  |  |  | (70)
Cash dividends – preferred stock (approximately $0.33 per share QTD and $0.67 per share YTD in both 2019 and in 2018) | (4,031) |  |  |  | (4,031) |  |
Cash dividends – common stock ($0.71 per share QTD and $1.38 per share YTD in 2019 and $0.67 per share QTD and $1.24 per share YTD in 2018) | (79,628) |  |  |  | (79,628) |  |
Total shareholders’ equity at end of period at Jun. 30, 2018 | 3,309,512 | 144,486 | 642 | 960,121 | 2,297,099 | (63,319) | (29,517)
Total shareholders’ equity at beginning of period at Mar. 31, 2018 | 3,243,430 | 144,486 | 642 | 956,536 | 2,234,301 | (53,354) | (39,181)
Net income | 111,341 |  |  |  | 111,341 |  |
Other comprehensive income (loss) | (9,965) |  |  |  |  | (9,965) |
Stock option exercises/stock unit conversions (53,035 shares QTD and 153,900 shares YTD in 2019 and 110,489 shares QTD and 428,599 shares YTD in 2018) | 6,283 |  |  |  | (3,451) |  | 9,734
Stock compensation expense recognized in earnings | 3,585 |  |  | 3,585 |  |  |
Purchase of treasury stock (496,307 shares QTD and 501,658 shares YTD in 2019 and 601 shares both QTD and YTD in 2018) | (70) |  |  |  |  |  | (70)
Cash dividends – preferred stock (approximately $0.33 per share QTD and $0.67 per share YTD in both 2019 and in 2018) | (2,015) |  |  |  | (2,015) |  |
Cash dividends – common stock ($0.71 per share QTD and $1.38 per share YTD in 2019 and $0.67 per share QTD and $1.24 per share YTD in 2018) | (43,077) |  |  |  | (43,077) |  |
Total shareholders’ equity at end of period at Jun. 30, 2018 | 3,309,512 | 144,486 | 642 | 960,121 | 2,297,099 | (63,319) | (29,517)
Cumulative effect of new accounting principle in period of adoption | (12,611) |  |  |  | (12,611) |  |
Total shareholders’ equity at beginning of period at Dec. 31, 2018 | 3,368,917 | 144,486 | 642 | 967,304 | 2,440,002 | (63,600) | (119,917)
Total shareholders' equity at beginning of period, as adjusted at Dec. 31, 2018 | 3,356,306 | 144,486 | 642 | 967,304 | 2,427,391 | (63,600) | (119,917)
Net income | 228,082 |  |  |  | 228,082 |  |
Other comprehensive income (loss) | 283,038 |  |  |  |  | 283,038 |
Stock option exercises/stock unit conversions (53,035 shares QTD and 153,900 shares YTD in 2019 and 110,489 shares QTD and 428,599 shares YTD in 2018) | 7,841 |  |  |  | (5,718) |  | 13,559
Stock compensation expense recognized in earnings | 8,018 |  |  | 8,018 |  |  |
Purchase of treasury stock (496,307 shares QTD and 501,658 shares YTD in 2019 and 601 shares both QTD and YTD in 2018) | (50,519) |  |  |  |  |  | (50,519)
Cash dividends – preferred stock (approximately $0.33 per share QTD and $0.67 per share YTD in both 2019 and in 2018) | (4,031) |  |  |  | (4,031) |  |
Cash dividends – common stock ($0.71 per share QTD and $1.38 per share YTD in 2019 and $0.67 per share QTD and $1.24 per share YTD in 2018) | (87,428) |  |  |  | (87,428) |  |
Total shareholders’ equity at end of period at Jun. 30, 2019 | 3,741,307 | 144,486 | 642 | 975,322 | 2,558,296 | 219,438 | (156,877)
Total shareholders’ equity at beginning of period at Mar. 31, 2019 | 3,593,578 | 144,486 | 642 | 970,958 | 2,495,268 | 93,774 | (111,550)
Net income | 111,586 |  |  |  | 111,586 |  |
Other comprehensive income (loss) | 125,664 |  |  |  |  | 125,664 |
Stock option exercises/stock unit conversions (53,035 shares QTD and 153,900 shares YTD in 2019 and 110,489 shares QTD and 428,599 shares YTD in 2018) | 2,956 |  |  |  | (1,717) |  | 4,673
Stock compensation expense recognized in earnings | 4,364 |  |  | 4,364 |  |  |
Purchase of treasury stock (496,307 shares QTD and 501,658 shares YTD in 2019 and 601 shares both QTD and YTD in 2018) | (50,000) |  |  |  |  |  | (50,000)
Cash dividends – preferred stock (approximately $0.33 per share QTD and $0.67 per share YTD in both 2019 and in 2018) | (2,015) |  |  |  | (2,015) |  |
Cash dividends – common stock ($0.71 per share QTD and $1.38 per share YTD in 2019 and $0.67 per share QTD and $1.24 per share YTD in 2018) | (44,826) |  |  |  | (44,826) |  |
Total shareholders’ equity at end of period at Jun. 30, 2019 | $ 3,741,307 | $ 144,486 | $ 642 | $ 975,322 | $ 2,558,296 | $ 219,438 | $ (156,877)

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