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Stock - Based Compensation - Summary of Stock Option Activity (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward] |  |  |  |
Outstanding, beginning of year, weighted average exercise price (in dollars per share) | $ 14.16 | $ 12.96 | $ 12.77 |
Exercised, weighted average exercise price (in dollars per share) | 12.61 | 12.09 | 11.55 |
Expired, weighted average exercise price (in dollars per share) |  | 16.01 | 15.26 |
Outstanding, end of year, weighted average exercise price (in dollars per share) | 14.26 | $ 14.16 | $ 12.96 | $ 12.77
Exercisable, weighted average exercise price (in dollars per share) | $ 14.13 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |  |
Outstanding, beginning of year (in shares) | 59,096 | 145,511 | 173,048 |
Exercised (in shares) | (3,628) | (85,440) | (25,632) |
Expired (in shares) |  | (975) | (1,905) |
Outstanding, end of year (in shares) | 55,468 | 59,096 | 145,511 | 173,048
Exercisable (in shares) | 51,745 |  |  |
Options outstanding, weighted average contractual term | 3 years 9 months 18 days | 4 years 9 months 18 days | 4 years 7 months 6 days | 5 years 4 months 24 days
Options exercisable, weighted average contractual term | 3 years 8 months 12 days |  |  |
Options expired, intrinsic value |  | $ 842,742 | $ 78,818 | $ 0
Options outstanding, intrinsic value | $ 18,331 | $ 143,737 | $ 156,445 |
Options exercisable, intrinsic value | $ 18,331 |  |  |
Options available (in shares) | 215,823 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest [Roll Forward] |  |  |  |
Expected to vest, beginning of the year, weighted average exercise price (in dollars per share) | $ 15.83 | $ 14.72 |  |
Vested, weighted average exercise price (in dollars per share) | 15.72 | 14.78 |  |
Forfeited, weighted average exercise price (in dollars per share) |  | 16.01 |  |
Expected to vest, end of the year, weighted average exercise price (in dollars per share) | $ 16.01 | $ 15.83 | $ 14.72 |
Expected to vest (in shares) | 9,969 | 25,650 |  |
Vested (in shares) | (6,246) | (15,380) |  |
Forfeited unvested options (in shares) |  | (301) |  |
Expected to vest (in shares) | 3,723 | 9,969 | 25,650 |
Options expected to vest, weighted average contractual term (years) | 5 years 1 month 6 days | 6 years | 6 years 6 months |
Options granted, weighted average fair value (in dollars per share) | $ 6.11 | $ 6.44 | $ 6.41 |
Options expected to vest, vested, grant date fair value (dollars per share) | 6.46 | 6.38 |  |
Stock Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward] |  |  |  |
Exercisable, weighted average exercise price (in dollars per share) | $ 14.13 | $ 13.82 | $ 12.45 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |  |
Exercised (in shares) | (3,628) | (85,440) |  |
Exercisable (in shares) | 51,745 | 49,127 | 119,861 |
Options available, expired |  | 975 | 1,905 |
Options available (in shares) | 155,845 | 155,845 | 154,870 | 152,965

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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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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=116856206&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock 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=116856206&loc=d3e5070-113901 + Details
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- Definition For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. + 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)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Weighted average price of options that were either forfeited or expired. + 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)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock 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)(iv)(3) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + 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 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + 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 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=116856206&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://fasb.org/us-gaap/role/ref/legacyRef -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=116856206&loc=d3e5070-113901 + Details
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- Definition Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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