Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) - $ / shares |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2015 |
Sep. 30, 2014 |
Sep. 30, 2015 |
Sep. 30, 2014 |
|
| Proceeds from exercise of options, shares | 0 | 5,000 | 0 | 5,000 |
| Cash dividends, per share | $ 0.4125 | $ 0.4075 | $ 0.4125 | $ 0.4075 |
| Common Stock [Member] | ||||
| Issuance of shares of common stock to the ESPP | 2,418 | |||