Other Borrowings - Narrative (Details) $ in Millions		1 Months Ended	12 Months Ended	120 Months Ended
	Dec. 12, 2022 USD ($)	Dec. 31, 2014 CAD ($)	Dec. 31, 2024 USD ($) officeBuilding	Dec. 31, 2024 CAD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Debt Instrument [Line Items]
Credit agreement balances			$ 142,763,000		$ 171,282,000
Secured borrowings			334,934,000		401,897,000
Other borrowings			57,106,000		59,204,000
Revolving Credit Facility
Debt Instrument [Line Items]
Commitment fee	0.30%
Securities sold under repurchase agreements | Maturity Overnight
Debt Instrument [Line Items]
Securities sold under agreements to repurchase			0		13,400,000
Secured Debt
Debt Instrument [Line Items]
Secured borrowings			11,700,000
Fixed Rate Promissory Note
Debt Instrument [Line Items]
Principal amount of debt			$ 66,400,000
Fixed interest rate			1.70%
Number of office buildings secured by debt | officeBuilding			3
Other borrowings			$ 57,100,000			$ 59,200,000
Term Loan Facility
Debt Instrument [Line Items]
Credit agreement balances	$ 200,000,000
Amount outstanding			142,800,000
Revolving Credit Facility
Debt Instrument [Line Items]
Credit agreement balances	$ 100,000,000
Amount outstanding			0
Credit Agreement | Base rate | Base Rate Loan
Debt Instrument [Line Items]
Basis spread on variable rate	0.75%
Credit Agreement | Base rate | Term SOFR Loans
Debt Instrument [Line Items]
Basis spread on variable rate	1.60%
Credit Agreement | Federal funds rate | Base Rate Loan
Debt Instrument [Line Items]
Basis spread on variable rate	0.50%
Credit Agreement | Secured Overnight Financing Rate (SOFR) | Base Rate Loan
Debt Instrument [Line Items]
Basis spread on variable rate	1.10%
Receivables Purchase Agreement | Secured Debt
Debt Instrument [Line Items]
Proceeds from debt issuance		$ 150		$ 650
Secured borrowings			$ 323,200,000		$ 392,500,000
Receivables Purchase Agreement | Canadian Commercial Paper Rate | Secured Debt
Debt Instrument [Line Items]
Basis spread on variable rate			0.825%