Employee Benefit Plans - Stock Based Compensation Narrative (Details) - USD ($)			3 Months Ended	12 Months Ended
	Dec. 16, 2019	Jul. 23, 2019	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Sep. 30, 2017	Jun. 06, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)							7,949,996
Grants in period (in shares)	184,378	3,707,901		3,892,279
Grants in period (in dollars per share)	$ 4.59	$ 4.25
Grants in period (in dollars per share)	$ 17.00	$ 15.60		$ 15.67
Exercises in period (in shares)			0	0	0	0
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)							2,271,427
Equity instruments other than options, grants in period (in shares)	74,673	1,389,570		1,464,243
Equity instruments other than options, grants in period (in dollars per share)	$ 17.00	$ 15.60		$ 15.67
Share-based payment expense			$ 0	$ 2,300,000	$ 0	$ 0
Equity instrument other than options, nonvested (in shares)				1,420,012	0
Nonvested award, excluding option, cost not yet recognized				$ 19,900,000
Cost not yet recognized, period for recognition				4 years 1 month 6 days
Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)							5,678,569
Award vesting period (in years)				5 years
Share-based payment expense			$ 0	$ 1,400,000	$ 0	$ 0
Equity instrument other than options, nonvested (in shares)				3,784,044
Nonvested award, excluding option, cost not yet recognized				$ 14,800,000
Cost not yet recognized, period for recognition				4 years 7 months 6 days
Expiration period (in years)	10 years	10 years
Expected term	6 years 6 months	6 years 6 months
Risk free interest rate	1.79%	1.90%
Expected volatility rate	22.23%	22.12%
Expected dividend rate	0.00%	0.00%
Minimum | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)		3 years
Maximum | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)				5 years
Share-based Payment Arrangement, Tranche One | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)				1 year
Share-based Payment Arrangement, Tranche One | Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)				1 year