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	68,816
Other comprehensive income (loss)	65,456
Stock option exercises/stock unit conversions (442,054 shares in 2017 and 1,875 shares in 2016)	97
Stock compensation expense recognized in earnings	2,482
Purchase of treasury stock (469 shares in 2017)	0
Cash dividends – preferred stock (approximately $0.34 per share in both 2017 and in 2016)	(2,016)
Cash dividends – common stock ($0.54 per share in 2017 and $0.53 per share in 2016)	(32,938)
Total shareholders’ equity at end of period at Mar. 31, 2016	2,992,240
Total shareholders’ equity at beginning of period at Dec. 31, 2016	3,002,528
Net income	84,941
Other comprehensive income (loss)	18,773
Stock option exercises/stock unit conversions (442,054 shares in 2017 and 1,875 shares in 2016)	24,747
Stock compensation expense recognized in earnings	3,103
Purchase of treasury stock (469 shares in 2017)	(42)
Cash dividends – preferred stock (approximately $0.34 per share in both 2017 and in 2016)	(2,016)
Cash dividends – common stock ($0.54 per share in 2017 and $0.53 per share in 2016)	(34,656)
Total shareholders’ equity at end of period at Mar. 31, 2017	$ 3,097,378