Regulatory Capital Requirements - Additional Information (Detail)	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Capital conservation buffer, percentage of common equity Tier 1 capital to risk-weighted assets	2.50%
FDIC
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 leverage capital, minimum capital adequacy requirements, Ratio	4.00%	4.00%
Common equity Tier 1 capital to risk-based assets ratio	4.50%	4.50%
Tier 1 risk-based capital, minimum capital adequacy requirements, Ratio	6.00%	6.00%
Total risk-based capital, minimum capital adequacy requirements, Ratio	8.00%	8.00%
Tier 1 leverage capital, To be well-capitalized under prompt corrective action provisions, Ratio	5.00%	5.00%
Common equity Tier 1 risk-based capital ratio	6.50%	6.50%
Tier 1 risk-based capital, To be well-capitalized under prompt corrective action provisions, Ratio	8.00%	8.00%
Total risk-based capital, to be well-capitalized under prompt corrective action provisions, Ratio	10.00%	10.00%

Capital Conservation Buffer, Percentage of Common equity Tier 1 Capital to Risk-Weighted Assets

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- Definition

Common Equity Tier One Capital to Average Assets for Capital Adequacy

+ References

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- Definition

Common Equity Tier One Capital to Average Assets to be Well Capitalized

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- Definition

The minimum Total risk based capital ratio (total capital divided by risk weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
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The Total risk based capital ratio (total capital divided by risk weighted assets) required to be categorized as "well capitalized", in the regulatory framework for prompt corrective action.

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The minimum amount of Tier 1 Leverage Capital for capital adequacy purposes divided by average assets as defined in the regulations.

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The amount of Tier 1 Leverage Capital required to be categorized as well capitalized divided by average assets as defined in the regulatory framework for prompt corrective action.

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

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The Tier 1 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.

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