Income Taxes - Narrative (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2023	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Examination [Line Items]
Income tax expense (benefit)		$ 36,205,000	$ (63,309,000)	$ 51,719,000
State		(1,942,000)	(5,332,000)	10,021,000
Deferred state and local income tax benefit		(16,855,000)	19,486,000	(6,290,000)
Valuation allowance		2,781,000	0
Unrecognized tax benefits		1,564,000	3,503,000	5,782,000	$ 7,923,000
Unrecognized tax benefits that would impact effective tax rate		1,800,000
Unrecognized tax benefits, income tax penalties and interest accrued		500,000	1,000,000.0
Unrecognized tax benefits, income tax penalties and interest expense		500,000
Reductions as a result of a lapse of the applicable statute of limitations		1,939,000	2,279,000	2,141,000
Tax interest and penalties, reduction resulting from lapse of applicable statute of limitations		700,000
Decrease in unrecognized tax benefits is reasonably possible		1,600,000
Decrease in tax interest and penalties is reasonably possible		600,000
Net operating loss carryforwards		23,800,000	0
Federal pre-1988 reserve with no tax provision		20,800,000
Tax credits and other tax benefits recognized		20,750,000	11,624,000	$ 9,146,000
Market Street Securities Corporation
Income Tax Examination [Line Items]
Deferred state and local income tax benefit	$ 23,700,000		23,700,000
State
Income Tax Examination [Line Items]
Income tax expense (benefit)		(7,400,000)
Unrecognized tax benefits		1,800,000	3,800,000
Release of uncertain tax positions		1,900,000
Tax credits and other tax benefits recognized		300,000	400,000
State | State Of Massachusetts
Income Tax Examination [Line Items]
Tax credits and other tax benefits recognized		3,200,000
Federal
Income Tax Examination [Line Items]
Tax credits and other tax benefits recognized		$ 16,500,000	$ 9,200,000