Summary of Significant Accounting Policies - Premises and Equipment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Transfers and Servicing of Financial Assets
Mortgage loans serviced for others	$ 771.4	$ 801.9
Buildings | Minimum
Premises and equipment
Useful lives	25 years
Buildings | Maximum
Premises and equipment
Useful lives	40 years
Building Improvements | Minimum
Premises and equipment
Useful lives	3 years
Building Improvements | Maximum
Premises and equipment
Useful lives	15 years
Furniture and equipment | Minimum
Premises and equipment
Useful lives	3 years
Furniture and equipment | Maximum
Premises and equipment
Useful lives	10 years