| **Net Income Per Share**          | 3 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
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| **Earnings Per Share [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
| Net Income Per Share              | NET INCOME PER SHARE Basic net income per share is computed by dividing net income by the weighted-average shares outstanding during the reporting period.  Diluted net income per share is computed by dividing net income by the combination of all dilutive common share equivalents, comprised of shares issuable under the Corporation’s share-based compensation plans, and the weighted-average shares outstanding during the reporting period.Dilutive common share equivalents include the dilutive effect of in-the-money share-based awards, which are calculated based on the average share price for each period using the treasury stock method.  Under the treasury stock method, the exercise price of share-based awards, the amount of compensation expense, if any, for future service that the Corporation has not yet recognized, and the amount of estimated tax benefits that would be recorded in additional paid-in capital when share-based awards are exercised, are assumed to be used to repurchase common stock in the current period. The following table reconciles basic and diluted net income per share for the three months ended March 31, 2016 and 2015. Three Months Ended March 31, 2016 2015 Net Income Weighted-Average Shares Per ShareAmount Net Income Weighted-Average Shares Per ShareAmountNet income available to common stockholders17,693 40,690,573 $0.43 16,172 37,709,883 $0.43Effect of dilutive stock options and warrants  226,399     290,191  Diluted net income per share$17,693 40,916,972 $0.43 $16,172 38,000,074 $0.43            Stock options to purchase 153,721 and 367,576 shares for the three months ended March 31, 2016 and 2015, respectively, were not included in the earnings per share calculation because the exercise price exceeded the average market price. |

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No definition available.
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| - Definition
The entire disclosure for earnings per share.
+ References
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