Consolidated Statements of Changes in Shareholders' Equity $ in Thousands	USD ($)
Total shareholders’ equity at beginning of period at Dec. 31, 2015	$ 2,890,343
Net income	140,323
Other comprehensive income (loss)	167,494
Stock option exercises/stock unit conversions (752,075 shares in 2017 and 67,075 shares in 2016)	3,586
Stock compensation expense recognized in earnings	5,477
Purchase of treasury stock (469 shares in 2017)	0
Cash dividends – preferred stock (approximately $0.67 per share in both 2017 and in 2016)	(4,031)
Cash dividends – common stock ($1.11 per share in 2017 and $1.07 per share in 2016)	(66,524)
Total shareholders’ equity at end of period at Jun. 30, 2016	3,136,668
Total shareholders’ equity at beginning of period at Dec. 31, 2016	3,002,528
Net income	170,494
Other comprehensive income (loss)	75,933
Stock option exercises/stock unit conversions (752,075 shares in 2017 and 67,075 shares in 2016)	44,149
Stock compensation expense recognized in earnings	6,291
Purchase of treasury stock (469 shares in 2017)	(42)
Cash dividends – preferred stock (approximately $0.67 per share in both 2017 and in 2016)	(4,031)
Cash dividends – common stock ($1.11 per share in 2017 and $1.07 per share in 2016)	(71,393)
Total shareholders’ equity at end of period at Jun. 30, 2017	$ 3,223,929