Loans And Allowance For Credit Losses (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Loans and Leases Receivable Disclosure [Line Items]
Loans To Principal Holders (over 10% ownership in the Company's stock)	$ 0
Unfunded Loan Commitments	15,800,000,000
Unused Approved Credit Card Lines of Credit	6,100,000,000
Pledged Financial Instruments, Not Separately Reported, Loans Receivable, for Federal Home Loan Bank Debt	2,600,000,000
Loans pledged at the Federal Reserve Bank as collateral for discount window borrowings	2,800,000,000
Lease Receivable, net of deferred origination costs	864,888,000	$ 879,641,000
Lease Receivable, Deferred Income	97,100,000	102,500,000
Financing Receivable, Nonaccrual, No Allowance	0	2,000,000.0
Commitments to lend additional funds to customers with restructured loans	$ 11,400,000	14,900,000
Period after which loans are deemed in default	90 days
Mortgages Held-for-sale, Fair Value Disclosure	$ 4,028,000	2,981,000
Unpaid Principal Balance on Personal Real Estate Loans Held for Sale	4,000,000.0
Personal Real Estate Loans HFS Past Due	0
Personal Real Estate Loans HFS on Non-Accrual Status	0
Foreclosed real estate	1,200,000	343,000
Residential Real Estate Acquired Through Foreclosure through Obtaining Physical Possession	1,000,000.0	343,000
Personal property acquired in repossession	2,300,000	2,200,000
Loans Receivable
Loans and Leases Receivable Disclosure [Line Items]
Interest Receivable	74,400,000	70,600,000
Commercial Portfolio Segment [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Accrued Interest, Writeoff	315,000	548,000
Personal Banking Portfolio Segment [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Accrued Interest, Writeoff	$ 6,300,000	$ 6,100,000