Consolidated Statements of Shareholders' Equity (Parenthetical) - $ / shares |
3 Months Ended | 12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2015 |
Sep. 30, 2015 |
Jun. 30, 2015 |
Mar. 31, 2015 |
Dec. 31, 2014 |
Sep. 30, 2014 |
Jun. 30, 2014 |
Mar. 31, 2014 |
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|
| Cash dividends declared | |||||||||||
| Common stock, dividend per share | $ 0.29 | $ 0.29 | $ 0.29 | $ 0.26 | $ 0.26 | $ 0.26 | $ 0.26 | $ 0.23 | $ 1.13 | $ 1.01 | $ 0.89 |