Loans And Allowance For Credit Losses (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Loans and Leases Receivable Disclosure [Line Items]
Interest Receivable	$ 71,900,000	$ 55,500,000
Loans To Principal Holders (over 10% ownership in the Company's stock)	0
Unfunded Loan Commitments	14,500,000,000
Unused Approved Credit Card Lines of Credit	5,400,000,000
Pledged Financial Instruments, Not Separately Reported, Loans Receivable, for Federal Home Loan Bank Debt	3,500,000,000
Loans pledged at the Federal Reserve Bank as collateral for discount window borrowings	3,100,000,000
Lease Receivable, net of deferred origination costs	867,020,000	779,888,000
Loans and Leases Receivable, Deferred Income	98,600,000	73,200,000
Financing Receivable, Nonaccrual, No Allowance	4,300,000	3,800,000
Commitments to lend additional funds to customers with restructured loans	$ 28,400,000	12,600,000
Period after which loans are deemed in default	90 days
Decrease in interest income resulting from modification to credit card loans		(661,000)
Mortgages Held-for-sale, Fair Value Disclosure	$ 1,585,000	0
Unpaid Principal Balance on Personal Real Estate Loans Held for Sale	1,500,000
Student Loans Held for Sale, Lower of Cost or Fair Value	2,200,000
Personal Real Estate Loans HFS Past Due	0
HFS Student Loans Past Due	0
HFS Student Loans on Non-Accrual Status	0
Personal Real Estate Loans HFS on Non-Accrual Status	0
Foreclosed real estate	270,000	96,000
Residential Real Estate Acquired Through Foreclosure through Obtaining Physical Possession	270,000	96,000
Personal property acquired in repossession	1,800,000	1,600,000
Commercial Portfolio Segment [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Accrued Interest, Writeoff	460,000	145,000
Personal Banking Portfolio Segment [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Accrued Interest, Writeoff	4,800,000	$ 3,200,000
Business [Member] | Commercial Portfolio Segment [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Modified, Writeoff	2,200,000
Consumer Loan [Member] | Personal Banking Portfolio Segment [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Modified, Writeoff	$ 729,000