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Other Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Defined Benefit Plans And Other Postretirement Benefit Plans Disclosures [Abstract] |  |
Schedule of Employees Eligible to Participate in Employee Stock Purchase Plan | A summary of shares purchased and average purchase price for the years ended December 31, 2020, 2019, and 208 is presented below.
|  | 2020 |  |  | 2019 |  |  | 2018 |
ESPP shares purchased |  |  | 8,005 |  |  |  | 5,151 |  |  |  | 4,132 |
Average purchase price per share |  | $ | 19.324 |  |  | $ | 26.015 |  |  | $ | 28.716 |
Schedule of Directors Stock Purchase Plan |
|  | 2020 |  |  | 2019 |  |  | 2018 |
DSPP shares purchased |  |  | 8,121 |  |  |  | 5,232 |  |  |  | 4,296 |
Average purchase price per share |  | $ | 19.217 |  |  | $ | 25.852 |  |  | $ | 28.940 |
| A summary of shares purchased and average purchase price for the years ended December 31, 2020, 2019, and 2018 is presented below.

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- Definition Tabular disclosure of employee stock purchase plan activity. + 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 (g) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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