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Consolidated Statements Of Changes In Shareholders' Equity (Parenthetical) (USD $)
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12 Months Ended | ||
|---|---|---|---|
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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| Common stock cash dividends, per share | $ 0.466 | $ 0.417 | $ 0.347 |
| Common stock dividend rate | 5.00% | 5.00% | 5.00% |
| Common stock dividend, shares | 275,900 | 225,937 | 211,564 |
| Shares under the dividend reinvestment and stock purchase plan | 17,749 | 19,683 | 23,165 |
| Shares under stock option plan | 72,585 | 65,441 | 28,264 |
| Shares under employee stock purchase plan | 7,710 | 8,420 | 10,784 |
| Shares of stock-based compensation awards | 9,830 | 8,480 | 11,290 |
| Private Placement [Member] | |||
| Shares issued through private placement | 650,000 | ||