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Stock-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2012
Stock-Based Compensation [Abstract] |
Summary of the activity under stock option plan |
|  | Options |  |  | Wgtd. Avg. Exercise Price |  |  | Wgtd. Avg. Remaining Contractual Term |  |  | Aggregate Intrinsic Value |
|  | (Dollars in thousands, except per share data) |
Nine Months Ended September 30, 2012 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2011 |  |  | 1,298,431 |  |  | $ | 30.14 |  |  |  |  |  |  |  |  |
Options granted |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Options exercised |  |  | (88,610 | ) |  |  | 17.11 |  |  |  |  |  |  |  |  |
Options canceled, forfeited or expired |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Outstanding at September 30, 2012 |  |  | 1,209,821 |  |  |  | 31.10 |  |  |  | 8.40 | Yrs |  | $ | 14,354 |
Exercisable at September 30, 2012 |  |  | 655,871 |  |  |  | 25.03 |  |  |  | 5.27 | Yrs |  | $ | 11,764 |
Non-vested options and changes |
|  | Options |
Non-vested at December 31, 2011 |  |  | 591,700 |
Options granted |  |  | — |
Options vested |  |  | (37,750 | )
Options forfeited |  |  | — |
Non-vested at September 30, 2012 |  |  | 553,950 |
Options granted and options exercised under stock option plan |
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2012 |  |  | 2011 |  |  | 2012 |  |  | 2011 |
|  | (Dollars in thousands, except per share data) |
Weighted average grant-date fair value per share of options granted |  | $ | — |  |  | $ | 12.11 |  |  | $ | — |  |  | $ | 12.46 |
Total intrinsic value of options exercised |  |  | 1,947 |  |  |  | 264 |  |  |  | 3,696 |  |  |  | 669 |
Cash received from options exercised |  |  | 794 |  |  |  | 263 |  |  |  | 1,516 |  |  |  | 701 |
Tax benefit realized from options exercised |  |  | 753 |  |  |  | 102 |  |  |  | 1,430 |  |  |  | 259 |
Stock-based employee compensation expense |
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2012 |  |  | 2011 |  |  | 2012 |  |  | 2011 |
|  | (Dollars in thousands) |
Stock-based compensation expense |  | $ | 391 |  |  | $ | 371 |  |  | $ | 1,189 |  |  | $ | 1,017 |
Tax |  |  | (151 | ) |  |  | (144 | ) |  |  | (460 | ) |  |  | (394 | )
Stock-based compensation expense, net of tax |  | $ | 240 |  |  | $ | 227 |  |  | $ | 729 |  |  | $ | 623 |
Remaining fair value of stock options |
|  | September 30, 2012 |
|  | (Dollars in thousands) |
Fair value of stock options |  | $ | 5,340 |
Assumptions used for computing stock-based employee compensation expense |
|  | Nine Months Ended September 30, |
|  | 2012 |  |  | 2011 |
Risk-free interest rate |  |  | 1.74 | % |  |  | 3.32 | %
Dividend yield |  |  | 2.00 | % |  |  | 2.00 | %
Stock price volatility |  |  | 32.88 | % |  |  | 28.86 | %
Expected term |  |  | 10 | Yrs |  |  | 10 | Yrs

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- Definition Tabular disclosure of the changes in outstanding nonvested performance-based 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 share-based compensation plans that may be presented in a single table for outstanding, vested and expected to vest, and exercisable awards. The information that may be disclosed in this table may include, but is not limited to, number of shares, weighted average exercise price, weighted average remaining contractual life, and aggregate intrinsic value. + References No definition available. + Details
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- Definition Tabular disclosure of the total intrinsic value of options exercised (or share units converted), share-based liabilities paid, and the total fair value of shares vested 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 (d)(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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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the weighted-average grant-date fair value of equity options or other equity instruments granted 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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