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

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-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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Amount of dividends that can be declared or paid without approval of regulatory agency.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(e))
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Ratio of Tier 1 risk-based capital to risk-weighted assets as defined by regulatory framework.

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Common Equity Tier 1 capital minimum buffer percent. Under Basel III, a banking organization must hold a capital conservation buffer comprised of common equity Tier 1 capital above its minimum risk-based capital requirements in an amount greater than 2.5% of total risk-weighted asset.

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Percentage extension of credit to affiliates limited to capital and surplus.

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Percentage extension of credit to any one affiliate limited to capital and surplus.

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Regulatory Matters - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2019	Jul. 31, 2013
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 Capital to Risk Weighted Assets	0.1076	0.1103
Total Capital to Risk Weighted Assets	0.1531	0.1378
Amount available for dividend distribution without prior approval from Regulatory Agency	$ 92.1
Percentage of Bank's capital and surplus of which extensions of credit to a single affiliate are limited	10.00%
Percentage of Bank's capital and surplus of which extensions of credit to all affiliates are limited	20.00%
Basel III New Requirements [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common Equity Tier 1 capital minimum buffer percent			2.50%
Minimum [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 Capital to Risk Weighted Assets	0.0850
Total Capital to Risk Weighted Assets	0.1050