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Capital Ratios (Narrative) (Details) $ in Billions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2023 USD ($) | Dec. 31, 2021
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Capital Ratios, Basel III, Capital Conservation Buffer, Year Three | 2.50% |
Community Bank Leverage Ratio, Minimum |  | 9.00%
Consolidated asset limit on small bank holding companies | $ 3 |
Bank [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Common Equity Tier 1 Risk-based Capital Ratio: Well Capitalized Minimum: Ratio | 0.065 |
Tier 1 Risk-based Capital Ratio: Well Capitalized Minimum: Ratio | 0.08 |
Tier 1 Leverage Ratio: Well Capitalized Minimum: Ratio | 0.05 |
Total Risk-based Capital Ratio: Well Capitalized Minimum: Ratio | 0.10 |
Capital ratios, capital conservation buffer | 6.28% |

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