CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Parenthetical) - $ / shares |
6 Months Ended | |
|---|---|---|
Jun. 30, 2017 |
Jun. 30, 2016 |
|
| Statement of Stockholders' Equity [Abstract] | ||
| Cash dividends (in dollars per share) | $ 0.90 | $ 0.88 |
| Net exercise of stock options and related tax benefit, shares | 10,035 | 12,168 |
| Common stock repurchased and returned to unissued status, shares | 22,356 | |
| Shares issued for dividend reinvestment plan (in shares) | 24,075 | 15,516 |
| Shares issued for employee stock ownership plan, shares | 27,412 | 31,435 |
| Directors deferred compensation plan, shares | 695 | 2,016 |
| Restricted stock activity, shares | 7,975 | 13,631 |
| Shares issued for purchase acquisition, shares | 32,553 | |