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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] | Following is a summary of stock option activity for the three-year period ending December 31, 2017:
|  | Options |  | Weighted- Average Exercise Price |  | Weighted- Average Remaining Contractual Term |  | Aggregate Intrinsic Value (in thousands)
Outstanding at January 1, 2015 |  |  | 1,008,781 |  |  | $ | 13.87 |  |  |  |  |  |  |  |  |
Exercised |  |  | (267,440 | ) |  | $ | 7.19 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (1,290 | ) |  | $ | 23.14 |  |  |  |  |  |  |  |  |
Expired |  |  | (9,446 | ) |  | $ | 5.92 |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2015 |  |  | 730,605 |  |  | $ | 16.40 |  |  |  | 3.6 years |  |  | $ | 3,722 |
Exercised |  |  | (443,283 | ) |  | $ | 14.03 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (933 | ) |  | $ | 24.68 |  |  |  |  |  |  |  |  |
Expired |  |  | (40,672 | ) |  | $ | 21.40 |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2016 |  |  | 245,717 |  |  | $ | 19.82 |  |  |  | 4.4 years |  |  | $ | 4,396 |
Exercised |  |  | (79,797 | ) |  | $ | 15.43 |  |  |  |  |  |  |  |  |
Outstanding and Exercisable at December 31, 2017 |  |  | 165,920 |  |  | $ | 21.92 |  |  |  | 4.2 years |  |  | $ | 2,292 |
Cash Proceeds Received and Tax Benefit from Share-based Payment Awards [Table Text Block] | Other data relating to option activity for the years ended December 31 are as follows:
(dollars in thousands) |  | 2017 |  | 2016 |  | 2015
Intrinsic value of options exercised |  | $ | 1,721 |  |  | $ | 7,832 |  |  | $ | 5,857 |
Fair value of options vested |  |  | — |  |  |  | 372 |  |  |  | 948 |
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] | The following table summarizes information with respect to stock options outstanding and exercisable under the Company’s plans at December 31, 2017:
|  | Options Outstanding and Exercisable
Exercise Price |  | Number Of Options |  | Weighted- Average Exercise Price |  | Weighted- Average Remaining Contractual Term
$17.18 – $17.48 |  |  | 60,267 |  |  | $ | 17.44 |  |  |  | 3.9 years |
$24.18 – $24.18 |  |  | 44,151 |  |  | $ | 24.18 |  |  |  | 3.2 years |
$24.68 – $24.68 |  |  | 61,502 |  |  | $ | 24.68 |  |  |  | 5.2 years |
|  |  | 165,920 |  |  | $ | 21.92 |  |  |  | 4.2 years |
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] | Following is a summary of time-vested stock awards activity for the three-year period ending December 31, 2017:
|  | Shares |  | Per Share Weighted- Average Grant Date Fair Value
Outstanding unvested at January 1, 2015 |  |  | 220,337 |  |  | $ | 22.64 |
Granted |  |  | 87,040 |  |  | $ | 29.23 |
Vested |  |  | (102,297 | ) |  | $ | 22.42 |
Forfeited |  |  | (3,131 | ) |  | $ | 24.10 |
Outstanding unvested at December 31, 2015 |  |  | 201,949 |  |  | $ | 24.58 |
Granted |  |  | 112,912 |  |  | $ | 24.66 |
Vested |  |  | (88,301 | ) |  | $ | 25.18 |
Forfeited |  |  | (3,144 | ) |  | $ | 26.09 |
Outstanding unvested at December 31, 2016 |  |  | 223,416 |  |  | $ | 25.26 |
Granted |  |  | 66,352 |  |  | $ | 37.49 |
Vested |  |  | (99,774 | ) |  | $ | 25.19 |
Forfeited |  |  | (1,346 | ) |  | $ | 31.22 |
Outstanding unvested at December 31, 2017 |  |  | 188,648 |  |  | $ | 29.55 |
Schedule of Nonvested Performance-based Units Activity [Table Text Block] | Following is a summary of performance share award activity for the three-year period ending December 31, 2017:
|  | Shares |  | Per Share Weighted- Average Grant Date Fair Value
Outstanding at January 1, 2015 |  |  | 126,803 |  |  | $ | 26.63 |
Granted at target |  |  | 69,978 |  |  | $ | 38.70 |
Vested |  |  | (40,474 | ) |  | $ | 24.68 |
Forfeited for performance below target |  |  | (3,810 | ) |  | $ | 24.68 |
Forfeited |  |  | (8,889 | ) |  | $ | 30.87 |
Outstanding at December 31, 2015 |  |  | 143,608 |  |  | $ | 32.68 |
Granted at target |  |  | 79,661 |  |  | $ | 28.25 |
Earned for performance above target |  |  | 20,650 |  |  | $ | 31.01 |
Vested |  |  | (98,270 | ) |  | $ | 27.74 |
Forfeited |  |  | (1,626 | ) |  | $ | 32.96 |
Outstanding at December 31, 2016 |  |  | 144,023 |  |  | $ | 32.92 |
Granted at target |  |  | 47,454 |  |  | $ | 47.12 |
Forfeited for performance below target |  |  | (24,873) |  |  | $ | 36.40 |
Vested |  |  | (39,407 | ) |  | $ | 40.15 |
Forfeited |  |  | (222 | ) |  | $ | 37.22 |
Outstanding at December 31, 2017 |  |  | 126,975 |  |  | $ | 35.29 |

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- Definition Tabular disclosure of cash received from exercise of stock options and similar instruments granted under share-based payment arrangements and tax benefit from exercise of stock options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=96867065&loc=SL79508275-113901 + Details
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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=96867065&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=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: 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=96867065&loc=d3e5070-113901 + Details
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