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Stock-Based Compensation Plans - Summary of changes in outstanding options (Details) $ / shares in Units, $ in Thousands | 12 Months Ended |
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Dec. 31, 2018 USD ($) Years $ / shares shares | Dec. 31, 2017 USD ($) Years $ / shares shares | Dec. 31, 2016 USD ($) integer $ / shares shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |  |  |
Options outstanding | shares | 147,538 | 174,510 | 236,385
Options granted | shares | 29,260 | 30,255 |
Options exercised | shares | (56,232) | (92,130) |
Options outstanding weighted average exercise price | $ 33.48 | $ 28.70 | $ 25.35
Options outstanding weighted average exercise price - Granted | 45.97 | 43.45 |
Options outstanding weighted average exercise price - Exercised | $ 25.17 | 24.93 |
Options outstanding weighted average exercise price - modification |  | $ 30.21 |
Options outstanding weighted average remaining term | 6.7 | 6.0 | 6.1
Options outstanding weighted average grant date fair value | $ | $ 1,782 | $ 1,901 | $ 2,440
Options granted weighted average grant date fair value | $ 427 | $ 440 |
Options exercised weighted average grant date fair value | $ | $ (546) | $ (842) |
Options modified weighted average grant date fair value | $ |  | $ (137) |
Options exercisable at December 31, 2018 | shares | 119,714 |  |
Options exercisable weighted average exercise price | $ 31.59 |  |
Options exerciseable weighted average remaining term | Years | 6.1 |  |
Options exercisable weighted average grant date fair value | $ | $ 1,346 |  |
Options vested during twelve months ended December 31, 2018 | shares | 46,030 |  |
Options vested weighted average grant date fair value | $ | $ 669 |  |

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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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