Summary Of Significant Accounting Policies (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Accounting Policies [Line Items]
Securities sold under agreements to repurchase with original maturities exceeding three months	$ 0	$ 700,000,000
Other real estate owned, excluding covered other real estate owned	9,900,000	4,300,000
Bank-owned life insurance	$ 157,300,000	$ 157,700,000
Minimum
Accounting Policies [Line Items]
Tax benefit realized on settlement	50.00%
Maximum
Accounting Policies [Line Items]
Lease term	7 years
Intangible assets with finite lives, amortization period	20 years
Furniture, fixtures and equipment | Minimum
Accounting Policies [Line Items]
Premises and equipment, useful lives	2 years
Furniture, fixtures and equipment | Maximum
Accounting Policies [Line Items]
Premises and equipment, useful lives	15 years
Software and computer-related equipment | Minimum
Accounting Policies [Line Items]
Premises and equipment, useful lives	2 years
Software and computer-related equipment | Maximum
Accounting Policies [Line Items]
Premises and equipment, useful lives	7 years
Buildings and improvements | Minimum
Accounting Policies [Line Items]
Premises and equipment, useful lives	7 years
Buildings and improvements | Maximum
Accounting Policies [Line Items]
Premises and equipment, useful lives	39 years
Land improvements
Accounting Policies [Line Items]
Premises and equipment, useful lives	15 years