Regulatory Capital (Narrative) (Details) $ in Billions	9 Months Ended
Sep. 30, 2020	Jan. 01, 2020 USD ($)	Dec. 31, 2019
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common equity Tier 1 ("CETI") capital ratio	0.045%		0.045%
Minimum Tier 1 capital to risk-weighted assets ratio	0.060		0.060
Minimum total capital to risk-weighted assets ratio	0.080		0.080
Minimum Tier 1 leverage ratio	0.040		0.040
CETI capital ratio	0.065%		0.065%
Tier 1 ratio	0.080		0.080
Total risk based capital ratio	0.10		0.100
Tier 1 leverage ratio	0.05%
Capital conservation buffer above required capital ratios in beginning January 1, 2016	2.50%
Growth Act [Member] \| Minimum [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
CBLR leverage ratio		9.00%
Growth Act [Member] \| Maximum [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
CBLR total consolidated assets		$ 10

Represents capital conservation buffer above the required capital ratios.

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- Definition

The minimum Tier One Common Equity Capital Ratio (Tier one capital divided by risk-weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action.

+ References

No definition available.

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The Tier 1 common equity capital ratio (Tier 1 capital divided by risk weighted assets) required to be categorized as "well capitalized" under the regulatory framework for prompt corrective action.

+ References

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- Definition

Community Bank Leverage Ratio To Be Well Capitalized

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Community Bank Leverage Ratio To Be Well Capitalized To Weighted Assets

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- Definition

Represents tier one Leverage Ratio.

+ References

No definition available.

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- Definition

Ratio of minimum total risk-based capital to risk-weighted assets required for capital adequacy as defined by regulatory framework.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958570-112826

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-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
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- Definition

Ratio of minimum total risk-based capital to risk-weighted assets categorized as well capitalized as defined by regulatory framework for prompt corrective action.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Ratio of minimum Tier 1 leverage capital to average assets required for capital adequacy as defined by regulatory framework.

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Ratio of minimum Tier 1 risk-based capital to risk-weighted assets required for capital adequacy as defined by regulatory framework.

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- Definition

Ratio of minimum Tier 1 risk-based capital to risk-weighted assets categorized as well capitalized as defined by regulatory framework for prompt corrective action.

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