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Regulatory Capital (Narrative) (Details)
Sep. 30, 2019
Jan. 01, 2019
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Common equity Tier 1 capital to risk-weighted assets minimum ratio 4.50%  
Total Capital to risk-weighted assets 8.00%  
Tier 1 leverage ratio 4.00%  
Capital conversion buffer percentage   2.50%
Minimum [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Minimum ratio of Tier 1 capital to risk-weighted assets 4.00%  
Maximum [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Minimum ratio of Tier 1 capital to risk-weighted assets 6.00%  
Conservation Buffer Rule Starting January 2016 [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Capital conversion buffer percentage 0.625%  
Conservation Buffer Rule Subsequent to 2016 [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Capital conversion buffer percentage 0.625%