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Borrowings - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Jun. 30, 2020 | Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2021
Debt Instrument [Line Items] |  |  |  |  |  |  |
FHLB borrowings | $ 150,100 |  |  | $ 150,100 |  | $ 10,111 | [1]
Federal home loan bank stock | 7,000 |  |  | 7,000 |  | 1,700 |
Subordinated notes, net outstanding | 39,937 |  |  | 39,937 |  | 39,986 | [1]
Subordinated Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Subordinated notes, net outstanding | 39,900 |  |  | $ 39,900 |  | 40,000 |
Subordinated Notes [Member] | 2029 Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Subordinated debt instrument maturity date |  |  |  | Oct. 15, 2029 |  |  |
Debt instrument carrying amount | 25,200 |  |  | $ 25,200 |  |  |
Debt instrument, unamortized premium | $ 704 |  |  | $ 704 |  |  |
Effective interest rate | 5.30% | 4.60% |  | 5.10% | 4.60% |  |
Subordinated Notes [Member] | 2030 Note [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Subordinated debt instrument maturity date |  |  |  | Jun. 01, 2030 |  |  |
Effective interest rate | 6.10% | 6.10% |  | 6.10% | 6.10% |  |
Unamortized debt issuance cost | $ 14,700 |  |  | $ 14,700 |  |  |
Unsecured Lines of Credit [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum overnight line of credit facilities available | 34,000 |  |  | 34,000 |  | 44,000 |
Overnight line of credit facilities outstanding | 0 |  |  | 0 |  | 0 |
Federal Reserve Paycheck Protection Program Liquidity [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Percentage of advances on PPP loan value and term |  |  | 100.00% |  |  |  |
Fixed annual cost basis points |  |  | 0.35% |  |  |  |
Total advances | 55 |  |  | $ 55 |  |  |
Maturity date of FRB borrowings |  |  |  | Jun. 06, 2025 |  |  |
FHLB [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Loans outstanding | $ 434,300 |  |  | $ 434,300 |  | 358,100 |
Federal home loan bank advances, maximum borrowing capacity percentage on assets |  |  |  | 30.00% |  |  |
Federal home loan bank, advances, interest Rate | 3.32% |  |  | 3.32% |  |  |
FHLB borrowings | $ 150,100 |  |  | $ 150,100 |  | 10,000 |
Subordinated debt instrument maturity date |  |  |  | May 08, 2023 |  |  |
FHLB [Member] | Restricted Equity Investments [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Federal home loan bank stock | 7,000 |  |  | $ 7,000 |  | $ 1,700 |
FHLB [Member] | Line of Credit [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
FHLB borrowings | 199,100 |  |  | 199,100 |  |  |
FHLB [Member] | Line of Credit [Member] | Public Deposits with Treasury Board of Virginia [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Assets pledged with federal home loan bank against credit facilities | $ 85,100 |  |  | $ 85,100 |  |  |
[1] | Derived from audited December 31, 2021 Consolidated Financial Statements.

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- Definition Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + Details
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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI https://asc.fasb.org/extlink&oid=123466204&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910 + Details
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