Goodwill and Other Intangible Assets, Mortgage Servicing Rights Roll-Forward (Details) - USD ($) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022	Jan. 01, 2022	Dec. 31, 2021
Summary Of Changes In Balance Of Mortgage Servicing Rights Asset And Mortgage Servicing Rights Valuation Allowance [Abstract]
Servicing Asset at Amortized Cost					$ 54,862
Cumulative effect of accounting methodology change				$ 2,296
Servicing Asset at Fair Value, Amount, Beginning Balance	$ 77,351	$ 57,158	$ 57,158
Additions	2,477	$ 6,316	7,279
Paydowns	(5,354)		(9,350)
Change in fair value model assumptions	8,338		5,715
Changes in fair value of asset	6,320		16,549
Servicing Asset at Fair Value, Amount, Ending Balance	89,131		77,351
Portfolio Of Residential Mortgage Loans Serviced For Others	$ 6,451,969		$ 6,711,820
Mortgage Servicing Rights Net To Servicing Portfolio	1.38%		1.15%