Employee Benefit Plans - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-Based Payment Arrangement [Abstract]
Employer matching contribution, percent of match for first 3% of compensation	100.00%
Employer matching contribution, percent of employees' gross pay, first 3%	3.00%
Employer matching contribution, percent of match for the next 2% of compensation	50.00%
Employer matching contribution, percent of employees' gross pay, next 2%	2.00%
Employer matching contribution, percent of match total	4.00%
Employer matching contribution, percent of employees' gross pay total	5.00%
Employee stock ownership plan, contribution expense	$ 11,900,000	$ 13,000,000	$ 13,900,000
Deferred compensation expense	$ 316,000	2,200,000	2,700,000
Defined Contribution Plan Disclosure [Line Items]
Purchase price of common stock (as percent)	95.00%
Options exercisable, intrinsic value	$ 0
Options outstanding, intrinsic value	0
Allocated stock-based compensation expense	12,200,000	$ 15,300,000	$ 15,900,000
Compensation not yet recognized, stock options	0
Compensation not yet recognized, share-based awards other than options	$ 14,500,000
Compensation cost not yet recognized, period for recognition	1 year 4 months 24 days
Options outstanding, intrinsic value	$ 0
Share price (in dollars per share)	$ 19.84
Options, exercises in period (in shares)	900	2,750	184,888
Options, exercises in period, intrinsic value	$ 8,000	$ 0	$ 1,300,000
Options, grants in period, gross (in shares)	0	0	0
Employee Stock Purchase Plan 2015
Defined Contribution Plan Disclosure [Line Items]
Maximum annual contributions per employee, amount	$ 25,000
Service period	6 months
Special Employee Stock Purchase Plan 2015
Defined Contribution Plan Disclosure [Line Items]
Maximum annual contributions per employee, amount	$ 10,000
Purchase price of common stock (as percent)	85.00%