Summary of Stock Option Activity (Details) - Stock Options	12 Months Ended
Dec. 31, 2019 $ / shares shares
Changes in shares granted for stock options for the year
Options outstanding, Beginning Balance \| shares	26,167
Options, Acquisitions \| shares	235,246
Options, Exercised \| shares	(175,161)
Options, forfeited \| shares	(2,787)
Options outstanding, Ending Balance \| shares	83,465
Options, Exercisable \| shares	72,315
Weighted-Average Exercise Price
Options outstanding, Weighted Average Exercise Price, Beginning Balance \| $ / shares	$ 25.84
Options, acquisitions, weighted average exercise price \| $ / shares	16.70
Options, exercised, weighted average exercise price \| $ / shares	16.53
Options, forfeited, weighted average exercise price \| $ / shares	25.84
Options outstanding, Weighted Average Exercise Price, Ending Balance \| $ / shares	19.61
Options exercisable, Weighted Average Exercise Price \| $ / shares	$ 18.65

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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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.

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The addition or reduction in the number of reserved shares that could potentially be issued under the option plan attributable to reasons other than grants, exercises, forfeitures, and expirations during the reporting period.

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

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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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 price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average price at which grantees could acquire or could have acquired the underlying shares with respect to any other type of change in shares reserved for issuance.

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Number of share options (or share units) exercised during the current period.

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