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Stock-based Compensation - Award Status (Details) - Stock option awards - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Shares
Outstanding at beginning of year (in shares)	53,185
Exercised (in shares)	(12,956)
Expired (in shares)	(1,144)
Outstanding at end of year (in shares)	39,085	53,185
Exercisable at end of year (in shares)	39,085
Weighted-Average Exercise Price
Outstanding at beginning of year (in dollars per share)	$ 22.00
Exercised (in dollars per share)	17.45
Expired (in dollars per share)	21.35
Outstanding at end of year (in dollars per share)	23.53	$ 22.00
Exercisable at end of year (in dollars per share)	$ 23.53
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term	5 years 10 months 17 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted-Average Remaining Contractual Life, Outstanding at end of year	5 years 10 months 17 days	5 years 10 months 24 days
Intrinsic Value, Outstanding at end of year (in dollars)		$ 292
Weighted-Average Remaining Contractual Life, Exercisable at end of year	5 years 10 months 17 days

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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.

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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.

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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.

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