Consolidated Statements of Changes in Shareholders' Equity $ in Thousands	USD ($)
Total shareholders’ equity at beginning of period at Dec. 31, 2014	$ 2,851,403
Net income	72,163
Other comprehensive income (loss)	18,305
Stock option exercises (1,875 shares in 2016 and 14,350 shares in 2015)	728
Stock compensation expense recognized in earnings	2,562
Tax benefits related to stock compensation	74
Cash dividends – preferred stock (approximately $0.34 per share in both 2016 and in 2015)	(2,016)
Cash dividends – common stock ($0.53 per share in 2016 and $0.51 per share in 2015)	(32,288)
Total shareholders’ equity at end of period at Mar. 31, 2015	2,910,931
Total shareholders’ equity at beginning of period at Dec. 31, 2015	2,890,343
Net income	68,779
Other comprehensive income (loss)	65,456
Stock option exercises (1,875 shares in 2016 and 14,350 shares in 2015)	96
Stock compensation expense recognized in earnings	2,482
Tax benefits related to stock compensation	38
Cash dividends – preferred stock (approximately $0.34 per share in both 2016 and in 2015)	(2,016)
Cash dividends – common stock ($0.53 per share in 2016 and $0.51 per share in 2015)	(32,938)
Total shareholders’ equity at end of period at Mar. 31, 2016	$ 2,992,240