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Banking Regulatory Ratios (Tables)
3 Months Ended
Dec. 31, 2013
Banking and Thrift [Abstract]  
Schedule of capital adequacy requirements
Based on the Company's calculations, it exceeded the applicable capital adequacy requirements as listed below.
(dollar amounts in millions)
 
December 31,
2013
 
September 30,
2013
 
Capital
Adequacy
Minimum
Tier 1 capital
 
$
7,898.7

 
$
7,449.2

 
N/A

Total risk-based capital
 
7,930.4

 
7,482.6

 
N/A

Tier 1 leverage ratio
 
58
%
 
58
%
 
4
%
Tier 1 risk-based capital ratio
 
59
%
 
58
%
 
4
%
Total risk-based capital ratio
 
59
%
 
58
%
 
8
%