Consolidated Statement of Changes in Shareholders' Equity (Unaudited) (Parenthetical) - $ / shares shares in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Common stock per share dividend amount	$ 1.50	$ 1.40
Retained Earnings [Member]
Common stock per share dividend amount	$ 1.50	$ 1.40
Series A Warrants [Member] | Common Stock [Member]
Exercise of warrants into shares of common stock	146,157	5,320
Exercise of warrants into shares of common stock	79,470	1,983