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Investment Securities and Other Investments - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2020 USD ($) Security | Dec. 31, 2019 USD ($) Security
Schedule Of Investments [Line Items] |  |
Securities pledged with Federal Reserve Bank of Richmond | Security | 0 | 0
Proceeds from sales, calls and maturities of available-for-sale | $ 53,595,000 | $ 44,397,000
Realized gain on sales, calls and maturities of available-for-sale | 211,000 | 451,000
Proceeds from calls, maturities, sales, paydowns and maturities of securities held to maturity | 1,212,000 | 3,280,000
Unrealized gain (loss) on held-to-maturity securities | 0 | 0
Held-to-maturity securities transferred to available for sale | 11,000,000 |
Federal home loan bank stock | 5,800,000 | 6,000,000
Federal reserve bank stock | 2,200,000 | 963,000
Correspondent bank stock | 248,000 | 248,000
Other investments | 3,000,000 | 911,000
Restricted investments | 11,200,000 | 8,100,000
Federal Home Loan Bank of Atlanta [Member] |  |
Schedule Of Investments [Line Items] |  |
Securities pledged | 29,400,000 | 55,700,000
Treasury Board Commonwealth of Virginia [Member] |  |
Schedule Of Investments [Line Items] |  |
Securities pledged | $ 12,500,000 | $ 12,000,000

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- Definition Amount of realized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27357-111563 + Details
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- Definition Amount of investment in debt security, measured at amortized cost, transferred to investment in debt security, measured at fair value, with change in fair value recognized in other comprehensive income (available-for-sale) and net income (trading). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27405-111563 + Details
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- Definition Federal Home Loan Bank (FHLB) stock represents an equity interest in a FHLB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 325 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=75031641&loc=d3e63345-112809 + Details
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- Definition Federal Reserve Bank stock represents an equity interest in the Federal Reserve Bank. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 325 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=75031641&loc=d3e63345-112809 + Details
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