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Stock-Based Compensation Plans (Tables) | 3 Months Ended
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Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] | The following table summarizes the Company’s stock option activity for the three month period ended March 31, 2015:
|  |  |  |  |  |  | Weighted |  |  |  |
|  |  |  | Weighted |  | Average |  |  |  |
|  |  |  | Average |  | Remaining |  | Aggregate |
|  |  |  | Exercise |  | Contractual |  | Intrinsic |
|  | Shares |  | Price |  | Term (Years) |  | Value* |
Outstanding at December 31, 2014 |  | 1,355,416 |  | $ | 25.36 |  |  |  |  |  |
Exercised |  | (115,416) |  | $ | 18.62 |  |  |  |  |  |
Forfeited or expired |  | (4,875) |  | $ | 26.60 |  |  |  |  |  |
Outstanding at March 31, 2015 |  | 1,235,125 |  | $ | 25.99 |  | 3.9 |  | $ | 4,833,000 |
Exercisable at March 31, 2015 |  | 488,418 |  | $ | 24.85 |  | 2.6 |  | $ | 2,469,000 |
* The aggregate intrinsic value of outstanding and exercisable stock options is defined as the difference between the closing price of the Company's stock on March 31, 2015, the last trading day of the quarter, of $29.90 and the exercise price multiplied by the number of in-the-money outstanding and exercisable stock options.
Schedule of Cash Proceeds Received from Share-based Payment Awards [Table Text Block] | The following table summarizes the Company’s stock option exercise activity for the three months ended March 31, 2015 and 2014:
|  | Three Months Ended March 31, |
|  | 2015 |  | 2014 |
|  | (Dollars in thousands) |
Total intrinsic value of stock options exercised |  | $ | 1,057 |  | $ | 37 |
Cash received from stock option exercises |  | $ | 2,149 |  | $ | 165 |
Income tax benefit from the exercise of stock options |  | $ | 412 |  | $ | 14 |
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] | The following table summarizes the Company’s restricted stock award activity for the three month period ended March 31, 2015:
|  |  |  |  |  |  | Weighted |  |  |  |
|  |  |  | Weighted |  | Average |  |  |  |
|  | Shares of |  | Average |  | Remaining |  | Aggregate |
|  | Restricted |  | Grant Date |  | Contractual |  | Intrinsic |
|  | Stock |  | Fair Value |  | Term (Years) |  | Value* |
Non-vested at December 31, 2014 |  | 54,050 |  | $ | 26.58 |  |  |  |  |  |
Issued |  | - |  |  | - |  |  |  |  |  |
Vested |  | - |  |  | - |  |  |  |  |  |
Forfeited |  | - |  |  | - |  |  |  |  |  |
Non-vested at March 31, 2015 |  | 54,050 |  | $ | 26.58 |  | 2.7 |  | $ | 1,616,000 |
| * | The aggregate intrinsic value of non-vested restricted stock was calculated using the closing price of the Company's stock on March 31, 2015, the last trading day of the quarter, of $29.90 multiplied by the number of non-vested restricted shares outstanding.

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- Definition Tabular disclosure of the amount of cash proceeds received from the exercise of stock options and similar instruments granted under share-based payment arrangements and the tax benefit realized from stock options exercised during the period. Disclosure may also include the intrinsic value of stock options exercised during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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