Employee Benefit Plans (Details) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($) Installment $ / shares shares	Dec. 31, 2020 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares
Defined Benefit Plan Disclosure [Line Items]
Employer contribution for defined contribution plan	$ 4.1	$ 3.9	$ 3.5
Employee Stock Ownership Plan, common stock, fair value	$ 28.1
Employee Stock Ownership Plan, common stock, shares outstanding (shares) | shares	122,582
Nonqualified Deferred Compensation Plan
Defined Benefit Plan Disclosure [Line Items]
Deferred compensation expense	$ 0.1	$ 0.4	$ 0.3
Number of annual installments of deferred compensation (installment) | Installment	2
Number of days after departure from board of directors for payment of deferred compensation (days)	90 days
Outside Directors
Defined Benefit Plan Disclosure [Line Items]
Number of deferred common stock (shares) | shares	6,944	10,593	10,738
Vested | $ / shares	$ 164.23	$ 111.19	$ 117.73