Investment Securities Available for Sale (Narrative) (Details)	Mar. 31, 2023 USD ($) security	Dec. 31, 2022 USD ($)
Financing Receivable, Impaired [Line Items]
Investment securities in a loss position for less than twelve months | security	89
Investment securities in a loss position for twelve months or longer | security	329
Allowance for credit loss | $	$ 0
Collateral Pledged
Financing Receivable, Impaired [Line Items]
Pledged to secure deposits | $	$ 4,850,000,000	$ 4,470,000,000