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CONDENSED 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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| Statement of Stockholders' Equity [Abstract] | |||
| Cash dividends per share (in dollars per share) | $ 1.62 | $ 1.54 | $ 1.46 |
| Exercise of stock options and related tax benefit, shares | 75,323 | 144,732 | 96,873 |
| Shares issued for dividend reinvestment plan, shares | 46,081 | 92,068 | 48,763 |
| Shares issued for employee stock ownership plan, shares | 31,192 | 17,290 | 25,655 |
| Directors deferred compensation plan, shares | 5,987 | 5,395 | 4,949 |
| Shares issued related to restricted stock awards, shares | 94,137 | 104,206 | 3,985 |
| Common stock repurchased and returned to unissued status, shares | 101,466 | ||
| Stock issued for purchase acquisition, shares | 1,080 | 2,093,689 | |
| Stock issued capital raise, shares | 1,006,250 | ||