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Capital Ratios (Narrative) (Details) - USD ($)
$ in Billions
3 Months Ended 12 Months Ended
Mar. 31, 2024
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  
Through September 1, 2025 [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 5.00%  
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 5.77%