Goodwill and Other Intangible Assets, Mortgage Servicing Rights Roll-Forward (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended		12 Months Ended
	Dec. 31, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Summary of Changes in MSR [Line Items]
Servicing Asset at Fair Value, Amount, Beginning Balance		$ 84,390	$ 77,351	$ 77,351
Servicing Asset at Fair Value, Additions		4,458	2,477	3,564
Servicing Asset at Fair Value, Disposals		(5,913)		(7,185)
Servicing Asset at Fair Value, Changes in Fair Value Resulting from Changes in Valuation Inputs or Changes in Assumptions		0		8,881
Servicing Asset at Fair Value, Other Changes in Fair Value		(959)		1,778
Servicing Asset at Fair Value, Amount, Ending Balance	$ 84,390	81,977		84,390
Portfolio Of Residential Mortgage Loans Serviced For Others	$ 7,364,492	$ 6,302,408		$ 7,364,492
Mortgage Servicing Rights Net To Servicing Portfolio	1.15%	1.30%		1.15%
Loan and Lease, Transfer from Held-in-Portfolio to Held-for-Sale		$ (74,737)	$ 6,833
Residential Mortgage [Member]
Summary of Changes in MSR [Line Items]
Loan and Lease, Transfer from Held-in-Portfolio to Held-for-Sale	$ 969,000
Proceeds from Sale, Loan, Held-for-Sale	$ 844,000