Benefit Plans - Stock Options Activity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Shares
Outstanding at beginning of year (in shares)	2,986,347	3,453,516	1,051,787
Acquired in business combinations (in shares)	0	0	3,130,171
Exercised (in shares)	(2,768,792)	(249,308)	(716,920)
Forfeited or expired (in shares)	0	(217,861)	(11,522)
Outstanding at end of year (in shares)	217,555	2,986,347	3,453,516
Exercisable at year-end (in shares)	217,555	2,986,347	3,339,517
Weighted Average Exercise Price
Outstanding at beginning of year (in USD per share)	$ 7	$ 8	$ 7
Acquired in business combinations (in USD per share)	0	0	8
Exercised (in USD per share)	7	8	7
Forfeited or expired (in USD per share)	0	11	8
Outstanding at end of year (in USD per share)	7	7	8
Exercisable at year-end (in USD per share)	$ 7	$ 7	$ 8