Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares |
9 Months Ended | |
|---|---|---|
Sep. 30, 2017 |
Sep. 30, 2016 |
|
| Consolidated Statements of Stockholders' Equity [Abstract] | ||
| Restricted stock compensation, shares | 18,079 | |
| Exercise of stock options, shares | 9,264 | |
| Cash dividends- common stock per share | $ 0.21 | $ 0.21 |
| Sale of treasury shares to 401(k), shares | 8,366 | 7,111 |
| Sale of treasury shares to deferred compensation plan, shares | 4,313 | 4,404 |