Stock Compensation Plans and Other Employee Benefit Plans - Narrative (Details) - USD ($)	12 Months Ended				108 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2020	Dec. 31, 2024	May 31, 2022	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares approved for issuance (in shares)						1,200,000
Shares available for future grants (in shares)	680,538				680,538
Number of stock options granted (in shares)					0
Stock-based compensation expense	$ 38,900,000	$ 33,500,000	$ 31,700,000
Tax benefit (expense) from stock-based compensation arrangements	8,300,000	7,400,000	7,000,000.0
Aggregate intrinsic value of options exercised	179,664	2,500,000	6,700,000
Actual tax benefit realized from option exercises	30,000	540,000	1,800,000
Excess tax benefits from stock-based compensation arrangements	86,457	2,200,000	5,200,000
Excess (deficit) tax benefit over estimate	4,400,000	1,800,000	580,000
Unrecognized compensation cost	$ 47,200,000				$ 47,200,000
Unrecognized compensation cost, period for recognition	2 years
Fair value of shares vested	$ 34,700,000	22,100,000	4,500,000
Expense for employer contribution to plan	19,700,000	19,200,000	16,200,000
Cash Incentive and Retention Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expense related to plan	0	0	0
Cash awards paid	0	$ 0	$ 0
Cash awards outstanding	$ 0				$ 0
Directors Deferred Fee and Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Increase in shares authorized (in shares)				200,000
Issued to directors (in shares)	14,927	63,001	59,174
Obligation to issue (in shares)	304,092				304,092
Available for future issuance under DDFS Plan (in shares)	52,508				52,508
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Term	10 years
Stock Options | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
Stock Options | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	5 years
Restricted Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares outstanding (in shares)	880,866	746,123	610,155		880,866		476,813
Restricted Shares | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	1 year
Restricted Shares | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	5 years
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
Performance period	3 years
Shares outstanding (in shares)	454,017	553,026	545,379		454,017		557,255
Performance Shares | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares outstanding (in shares)	670,000				670,000
LTIP Awards | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of performance based award payouts	0.00%
LTIP Awards | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of performance based award payouts	150.00%
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of purchase price of shares	95.00%
Employee stock purchase plan issuance (in shares)	32,942	46,034	40,421
Compensation expense employee stock purchase plan	$ 0	$ 0	$ 0
Increase in shares authorized (in shares)		200,000
Common stock obligation to issue (in shares)	6,540				6,540
Available for future grants under ESPP (in shares)	133,496				133,496