| **Net Income Per Share**          | 9 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 September 30, 2013 and 2012. Three Months Ended September 30, 20132012 Net IncomeWeighted-Average SharesPer ShareAmountNet IncomeWeighted-Average SharesPer ShareAmountBasic net income per share:$10,403  $11,236  Less: Preferred Stock dividends and discount accretion(430)  (1,134)  Net income available to common stockholders9,97328,806,809$0.3510,10228,649,996$0.35Effect of dilutive stock options and warrants274,663 238,080 Diluted net income per share:      Net income available to common stockholders$9,97329,081,472$0.35$10,10228,888,076$0.35The following table reconciles basic and diluted net income per share for the nine months ended September 30, 2013 and 2012 . Nine Months Ended September 30, 20132012 Net IncomeWeighted-Average SharesPer ShareAmountNet IncomeWeighted-Average SharesPer ShareAmountBasic net income per share:$33,083  $34,812  Less: Preferred Stock dividends and discount accretion(2,139)  (3,404)  Net income available to common stockholders30,94428,769,206$1.0831,40828,619,186$1.09Effect of dilutive stock options and warrants257,260 200,097 Diluted net income per share:      Net income available to common stockholders$30,94429,026,466$1.07$31,40828,819,283$1.09Stock options to purchase 615,151 and 770,001 shares for the three months ended September 30, 2013, and 2012, respectively, were not included in the earnings per share calculation because the exercise price exceeded the average market price.  Stock options to purchase 667,382 and 846,499 shares for the nine months ended September 30, 2013, and 2012, respectively, were not included in the earnings per share calculation because the exercise price exceeded the average market price. |

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| - Definition
The entire disclosure for earnings per share.
+ References
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