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Regulatory Requirements (Tables)
 3 Months Ended
Mar. 31, 2020
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
March 31, 2020
 
Amount
 
Ratio
 
Amount
 
Ratio
 
Amount
 
Ratio (2)
CSC
 
 
 
 
 
 
 
 
 
 
 
 
Common Equity Tier 1 Risk-Based Capital
 
$
18,197

 
18.4
%
 
N/A

 
 
 
$
4,457

 
4.5
%
Tier 1 Risk-Based Capital
 
20,990

 
21.2
%
 
N/A

 
 
 
5,942

 
6.0
%
Total Risk-Based Capital
 
21,023

 
21.2
%
 
N/A

 
 
 
7,923

 
8.0
%
Tier 1 Leverage
 
20,990

 
6.9
%
 
N/A

 
 
 
12,137

 
4.0
%
Supplementary Leverage Ratio
 
20,990

 
6.8
%
 
N/A

 
 
 
9,309

 
3.0
%
CSB
 
 
 
 
 
 
 
 
 
 
 
 
Common Equity Tier 1 Risk-Based Capital
 
$
15,413

 
19.7
%
 
$
5,075

 
6.5
%
 
$
3,514

 
4.5
%
Tier 1 Risk-Based Capital
 
15,413

 
19.7
%
 
6,247

 
8.0
%
 
4,685

 
6.0
%
Total Risk-Based Capital
 
15,445

 
19.8
%
 
7,808

 
10.0
%
 
6,247

 
8.0
%
Tier 1 Leverage
 
15,413

 
6.9
%
 
11,114

 
5.0
%
 
8,891

 
4.0
%
Supplementary Leverage Ratio
 
15,413

 
6.7
%
 
N/A

 
N/A

 
6,867

 
3.0
%
 
 
 
 
 
 
 
 
 
 
 
 
 
December 31, 2019
 
 
 
 
 
 
 
 
 
 
 
 
CSC
 
 
 
 
 
 
 
 
 
 
 
 
Common Equity Tier 1 Risk-Based Capital
 
$
17,660

 
19.5
%
 
N/A

 
 
 
$
4,073

 
4.5
%
Tier 1 Risk-Based Capital
 
20,453

 
22.6
%
 
N/A

 
 
 
5,431

 
6.0
%
Total Risk-Based Capital
 
20,472

 
22.6
%
 
N/A

 
 
 
7,241

 
8.0
%
Tier 1 Leverage
 
20,453

 
7.3
%
 
N/A

 
 
 
11,189

 
4.0
%
Supplementary Leverage Ratio
 
20,453

 
7.1
%
 
N/A

 
 
 
8,604

 
3.0
%
CSB
 
 
 
 
 
 
 
 
 
 
 
 
Common Equity Tier 1 Risk-Based Capital
 
$
14,819

 
20.7
%
 
$
4,649

 
6.5
%
 
$
3,218

 
4.5
%
Tier 1 Risk-Based Capital
 
14,819

 
20.7
%
 
5,722

 
8.0
%
 
4,291

 
6.0
%
Total Risk-Based Capital
 
14,837

 
20.7
%
 
7,152

 
10.0
%
 
5,722

 
8.0
%
Tier 1 Leverage
 
14,819

 
7.1
%
 
10,486

 
5.0
%
 
8,389

 
4.0
%
Supplementary Leverage Ratio
 
14,819

 
6.8
%
 
N/A

 
N/A

 
6,497

 
3.0
%
(1) In the interagency regulatory capital and liquidity rules adopted in October 2019, Category III banking organizations such as CSC were given the ability to opt-out of the inclusion of AOCI in regulatory capital, and CSC made this opt-out election as of January 1, 2020. Therefore, AOCI is excluded from the amounts and ratios presented as of March 31, 2020. In 2019, CSC and CSB were required to include all components of AOCI in regulatory capital; the amounts and ratios for December 31, 2019 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 a countercyclical capital buffer above the regulatory minimum risk-based capital ratios. The capital conservation buffer and countercyclical capital buffer were 2.5% and zero percent, respectively, for both periods presented. 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 March 31, 2020, 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:
 
 
March 31, 2020
 
December 31, 2019
Net Capital
 
$
3,472

 
$
3,700

Minimum net capital required
 
0.250

 
0.250

2% of aggregate debit balances
 
419

 
446

Net Capital in excess of required net capital
 
$
3,053

 
$
3,254