Mortgage Servicing Rights - Narrative (Details) - Mortgage loans - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value [Abstract]
Mortgage servicing rights, fair value	$ 35.4	$ 38.8
Servicing asset at fair value, assumptions used to estimate fair value, weighted average life	7 years 7 months 6 days	7 years 9 months 18 days
Impairment reversals	$ 0.0		$ (3.4)
Permanent impairment charged against carrying value	$ 0.0
Minimum
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value [Abstract]
Servicing assets at fair value, assumptions used to estimate fair value, discount rate	11.10%	11.90%
Servicing assets at fair value, assumptions used to estimate fair value, prepayment speed	0.20%	0.40%
Maximum [Member]
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value [Abstract]
Servicing assets at fair value, assumptions used to estimate fair value, discount rate	12.40%	12.80%
Servicing assets at fair value, assumptions used to estimate fair value, prepayment speed	2.20%	1.60%