CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Parenthetical) - $ / shares |
3 Months Ended | 6 Months Ended | 12 Months Ended | ||||||
|---|---|---|---|---|---|---|---|---|---|
Mar. 31, 2016 |
Sep. 30, 2015 |
Jun. 30, 2015 |
Mar. 31, 2015 |
Dec. 31, 2014 |
Jun. 30, 2014 |
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Statement Of Stockholders Equity [Abstract] | |||||||||
| Cash dividends declared per share | $ 0.07 | $ 0.06 | $ 0.06 | $ 0.06 | $ 0.14 | $ 0.08 | $ 0.29 | $ 0.18 | $ 0.22 |