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Employee Benefit Plans - Options Outstanding by Exercise Price Range (Details) - Officer and Employee Plans [Member] - $ / shares | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |
Exercise Prices (in dollars per share) | $ 11.85 | $ 10.57 | $ 10.62
Number Outstanding (in shares) | 187,316 | 717,524 | 817,414
Options Outstanding, Weighted Average Remaining Life | 5 years 1 month 6 days |  |
Options Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 11.85 |  |
Options, Number Exercisable (in shares) | 163,861 |  |
Options Exercisable, Weighted Average Exercise Price (in dollars per share) | $ 11.40 |  |
6.60 [Member] |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |
Exercise Prices (in dollars per share) | $ 6.60 |  |
Number Outstanding (in shares) | 38,250 |  |
Options Outstanding, Weighted Average Remaining Life | 4 years 5 months 12 days |  |
Options Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 6.60 |  |
Options, Number Exercisable (in shares) | 38,250 |  |
Options Exercisable, Weighted Average Exercise Price (in dollars per share) | $ 6.60 |  |
6.80 [Member] |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |
Exercise Prices (in dollars per share) | $ 6.80 |  |
Number Outstanding (in shares) | 16,875 |  |
Options Outstanding, Weighted Average Remaining Life | 3 years 5 months 1 day |  |
Options Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 6.80 |  |
Options, Number Exercisable (in shares) | 16,875 |  |
Options Exercisable, Weighted Average Exercise Price (in dollars per share) | $ 6.80 |  |
9.48 [Member] |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |
Exercise Prices (in dollars per share) | $ 9.48 |  |
Number Outstanding (in shares) | 26,875 |  |
Options Outstanding, Weighted Average Remaining Life | 5 years 5 months 12 days |  |
Options Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 9.48 |  |
Options, Number Exercisable (in shares) | 26,875 |  |
Options Exercisable, Weighted Average Exercise Price (in dollars per share) | $ 9.48 |  |
9.60 [Member] |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |
Exercise Prices (in dollars per share) | $ 9.60 |  |
Number Outstanding (in shares) | 35,625 |  |
Options Outstanding, Weighted Average Remaining Life | 6 years 5 months 1 day |  |
Options Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 9.60 |  |
Options, Number Exercisable (in shares) | 35,625 |  |
Options Exercisable, Weighted Average Exercise Price (in dollars per share) | $ 9.60 |  |
11.67 [Member] |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |
Exercise Prices (in dollars per share) | $ 11.67 |  |
Number Outstanding (in shares) | 2,000 |  |
Options Outstanding, Weighted Average Remaining Life | 3 years 3 months 29 days |  |
Options Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 11.67 |  |
Options, Number Exercisable (in shares) | 2,000 |  |
Options Exercisable, Weighted Average Exercise Price (in dollars per share) | $ 11.67 |  |
14.40 [Member] |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |
Exercise Prices (in dollars per share) | $ 14.40 |  |
Number Outstanding (in shares) | 12,805 |  |
Options Outstanding, Weighted Average Remaining Life | 1 year 5 months 1 day |  |
Options Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 14.40 |  |
Options, Number Exercisable (in shares) | 12,805 |  |
Options Exercisable, Weighted Average Exercise Price (in dollars per share) | $ 14.40 |  |
15.05 [Member] |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |
Exercise Prices (in dollars per share) | $ 15.05 |  |
Number Outstanding (in shares) | 41,720 |  |
Options Outstanding, Weighted Average Remaining Life | 8 years 4 days |  |
Options Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 15.05 |  |
Options, Number Exercisable (in shares) | 18,265 |  |
Options Exercisable, Weighted Average Exercise Price (in dollars per share) | $ 15.05 |  |
31.96 [Member] |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |
Exercise Prices (in dollars per share) | $ 31.96 |  |
Number Outstanding (in shares) | 13,166 |  |
Options Outstanding, Weighted Average Remaining Life | 5 months 1 day |  |
Options Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 31.96 |  |
Options, Number Exercisable (in shares) | 13,166 |  |
Options Exercisable, Weighted Average Exercise Price (in dollars per share) | $ 31.96 |  |

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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://www.xbrl.org/2003/role/presentationRef -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=96867065&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + 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)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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