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Regulatory Requirements (Tables)
 9 Months Ended
Sep. 30, 2019
Banking and Thrift [Abstract]  
Regulatory Capital and Ratios The regulatory capital and ratios for CSC (consolidated) and CSB are as follows:

 
Actual (1)
 
Minimum to be
Well Capitalized
 
Minimum Capital Requirement
September 30, 2019
 
Amount
 
Ratio
 
Amount
 
Ratio
 
Amount
 
Ratio (2)
CSC
 
 
 
 
 
 
 
 
 
 
 
 
Common Equity Tier 1 Risk-Based Capital
 
$
17,264

 
20.0
%
 
N/A

 
 
 
$
3,877

 
4.5
%
Tier 1 Risk-Based Capital
 
20,057

 
23.3
%
 
N/A

 
 
 
5,170

 
6.0
%
Total Risk-Based Capital
 
20,075

 
23.3
%
 
N/A

 
 
 
6,893

 
8.0
%
Tier 1 Leverage
 
20,057

 
7.3
%
 
N/A

 
 
 
10,945

 
4.0
%
Supplementary Leverage Ratio (1)
 
20,057

 
7.1
%
 
N/A

 
 
 
8,418

 
3.0
%
CSB
 
 
 
 
 
 
 
 
 
 
 
 
Common Equity Tier 1 Risk-Based Capital
 
$
15,577

 
22.9
%
 
$
4,430

 
6.5
%
 
$
3,067

 
4.5
%
Tier 1 Risk-Based Capital
 
15,577

 
22.9
%
 
5,452

 
8.0
%
 
4,089

 
6.0
%
Total Risk-Based Capital
 
15,594

 
22.9
%
 
6,815

 
10.0
%
 
5,452

 
8.0
%
Tier 1 Leverage
 
15,577

 
7.4
%
 
10,537

 
5.0
%
 
8,429

 
4.0
%
Supplementary Leverage Ratio (1)
 
15,577

 
7.2
%
 
N/A

 
N/A

 
6,524

 
3.0
%
 
 
 
 
 
 
 
 
 
 
 
 
 
December 31, 2018
 
 
 
 
 
 
 
 
 
 
 
 
CSC
 
 
 
 
 
 
 
 
 
 
 
 
Common Equity Tier 1 Risk-Based Capital
 
$
16,813

 
17.6
%
 
N/A

 
 
 
$
4,295

 
4.5
%
Tier 1 Risk-Based Capital
 
19,606

 
20.5
%
 
N/A

 
 
 
5,726

 
6.0
%
Total Risk-Based Capital
 
19,628

 
20.6
%
 
N/A

 
 
 
7,635

 
8.0
%
Tier 1 Leverage
 
19,606

 
7.1
%
 
N/A

 
 
 
11,058

 
4.0
%
CSB
 
 
 
 
 
 
 
 
 
 
 
 
Common Equity Tier 1 Risk-Based Capital
 
$
15,832

 
19.7
%
 
$
5,233

 
6.5
%
 
$
3,623

 
4.5
%
Tier 1 Risk-Based Capital
 
15,832

 
19.7
%
 
6,441

 
8.0
%
 
4,831

 
6.0
%
Total Risk-Based Capital
 
15,853

 
19.7
%
 
8,051

 
10.0
%
 
6,441

 
8.0
%
Tier 1 Leverage
 
15,832

 
7.2
%
 
11,044

 
5.0
%
 
8,836

 
4.0
%
(1) Beginning in 2019, CSC and CSB are subject to the “advanced approaches” framework under the Basel III capital rule. As a result, we are now required to include all components of AOCI in regulatory capital and report our supplementary leverage ratio, which is calculated as Tier 1 capital divided by total leverage exposure. Total leverage exposure includes all on-balance sheet assets and certain off-balance sheet exposures, including unused commitments. Prior to 2019, CSC and CSB elected to opt-out of the requirement to include most components of AOCI in Common Equity Tier 1 Capital; the amounts and ratios for December 31, 2018 are presented on this basis.
(2) Under the Basel III capital rule, CSC and CSB are also required to maintain a capital conservation buffer and, beginning in 2019, a countercyclical capital buffer above the regulatory minimum risk-based capital ratios. The capital conservation buffer became 2.5% on January 1, 2019 (1.875% at December 31, 2018). At September 30, 2019, the countercyclical capital buffer was zero percent. If either buffer falls below the minimum requirement, the Company would be subject to limits on capital distributions and discretionary bonus payments to executive officers. At September 30, 2019 the minimum capital requirement plus capital conservation buffer and countercyclical capital buffer for Common Equity Tier 1 Risk-Based Capital, Tier 1 Risk-Based Capital, and Total Risk-Based Capital ratios were 7.0%, 8.5%, and 10.5%, respectively.
N/A Not applicable.
Net Capital and Net Capital Requirements
Net capital and net capital requirements for CS&Co are as follows:
 
 
September 30, 2019
 
December 31, 2018
Net Capital
 
$
2,235

 
$
2,304

Minimum net capital required
 
0.250

 
0.250

2% of aggregate debit balances
 
440

 
436

Net Capital in excess of required net capital
 
$
1,795

 
$
1,868