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Investment Securities and Other Investments - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2019 USD ($) Security | Dec. 31, 2018 USD ($) 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 | $ 44,400,000 | $ 5,300,000
Realized gain on sales, calls and maturities of available-for-sale | 451,000 | 5,000
Proceeds from sale and maturity of held-to-maturity securities | 3,300,000 | 1,900,000
Unrealized gain (loss) on held-to-maturity securities | 0 | 0
Federal home loan bank stock | 6,012,000 |
Federal reserve bank stock | 963,000 |
Community bankers bank stock | 248,000 |
Other investments | 911,000 |
Restricted investments | 8,100,000 |
Federal Home Loan Bank of Atlanta [Member] |  |
Schedule Of Investments [Line Items] |  |
Securities pledged | 55,700,000 | 9,800,000
Treasury Board of Virginia [Member] |  |
Schedule Of Investments [Line Items] |  |
Securities pledged | $ 11,800,000 | $ 16,200,000

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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=118939692&loc=d3e27357-111563 + 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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