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Capital Ratios (Narrative) (Details) - USD ($) $ in Billions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total Risk-based Capital Ratio: Ratio | 15.78% |
Capital Ratios, Basel III, Capital Conservation Buffer, Year Three | 2.50% |
Community Bank Leverage Ratio, Minimum |  | 9.00%
Paycheck Protection Program, Risk-Weight For Risk-Based Capital Rules | 0.00% |
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: Ratio | 14.52% | 14.62%
Tier One Leverage Capital to Average Assets | 9.71% | 9.59%
Common Equity Tier 1 Risk-based Capital Ratio: Well Capitalized Minimum: Ratio | 6.50% |
Tier 1 Risk-based Capital Ratio: Well Capitalized Minimum: Ratio | 8.00% |
Tier 1 Leverage Ratio: Well Capitalized Minimum: Ratio | 5.00% |
Total Risk-based Capital Ratio: Well Capitalized Minimum: Ratio | 10.00% |
Capital ratios, capital conservation buffer | 7.78% |
Total Risk-based Capital Ratio: Ratio | 15.78% | 15.87%

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