Benefit Plans - Stock Options Activity (Details) - $ / shares	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Shares
Outstanding at beginning of year (in shares)	3,453,516	1,051,787	446,980
Acquired in business combinations (in shares)	0	3,130,171	1,803,165
Exercised (in shares)	(249,308)	(716,920)	(975,325)
Forfeited or expired (in shares)	(217,861)	(11,522)	(223,033)
Outstanding at end of year (in shares)	2,986,347	3,453,516	1,051,787
Exercisable at year-end (in shares)	2,986,347	3,339,517	604,003
Weighted Average Exercise Price
Outstanding at beginning of year (in USD per share)	$ 8	$ 7	$ 13
Acquired in business combinations (in USD per share)	0	8	5
Exercised (in USD per share)	8	7	5
Forfeited or expired (in USD per share)	11	8	14
Outstanding at end of year (in USD per share)	7	8	7
Exercisable at year-end (in USD per share)	$ 7	$ 8	$ 7

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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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.

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Weighted average price of options that were either forfeited or expired.

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

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Share-based Compensation Arrangement by Share-based Payment Award, Options, Acquired In Business Combination

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