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Loans And Allowance For Credit Losses (Narrative) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Loans and Leases Receivable Disclosure [Line Items]    
Loans To Principal Holders (over 10% ownership in the Company's stock) $ 0  
Unfunded Loan Commitments 13,000,000,000.0  
Unused Approved Credit Card Lines of Credit 5,000,000,000.0  
Loans pledged at the Federal Home Loan Bank as collateral for borrowings and letters of credit obtained to secure public deposits 3,900,000,000  
Loans pledged at the Federal Reserve Bank as collateral for discount window borrowings 1,500,000,000  
Net Investment in Direct Financing and Sales Type Leases 797,441,000 $ 795,826,000
Deferred income on direct financing and sales-type leases 66,300,000 71,800,000
Property Subject to or Available for Operating Lease, Net $ 13,700,000 14,700,000
Period after which loans are deemed in default 90 days  
Decrease in interest income resulting from modification to credit card loans $ (965,000)  
Commitments to lend additional funds to customers with restructured loans 10,700,000 4,700,000
Loans Held-for-sale, Fair Value Disclosure 39,400,000  
Unpaid Principal Balance on Personal Real Estate Loans Held for Sale 38,000,000.0  
Student Loans Held for Sale, Lower of Cost or Fair Value 5,700,000  
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 93,000 365,000
Personal property acquired in repossession 1,400,000 $ 5,500,000
Business [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Financing Receivable, Nonaccrual, No Allowance $ 9,400,000