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Borrowings - Additional Information (Detail) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Oct. 31, 2019 | May 31, 2015
Debt Instrument [Line Items] |  |  |  |  |
Federal home loan bank advance | $ 311,700,000 | $ 10,111,000 |  |  |
Federal home loan bank stock | 14,700,000 | 1,700,000 |  |  |
Subordinated notes, net | 39,920,000 | 39,986,000 |  |  |
Subordinated debt [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Subordinated notes, net | $ 39,900,000 | $ 40,000,000.0 |  |  |
Subordinated debt [Member] | 2030 Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Subordinated debt instrument maturity date | Jun. 01, 2030 |  |  |  |
Subordinated notes, net |  |  |  |  | $ 15,000,000
Stated Interest Rate | 6.00% |  |  |  |
Debt Instrument, Frequency of Periodic Payment | semi-annually |  |  |  |
Effective interest rate | 6.11% | 6.12% | 6.12% |  |
Unamortized debt issuance cost | $ 14,700,000 | $ 14,700,000 |  |  |
Subordinated debt [Member] | 2030 Notes [Member] | SOFR [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Subordinated debt instrument variable interest rate spread | 5.87% |  |  |  |
Subordinated debt [Member] | 2029 Bay Banks Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated Interest Rate | 5.625% |  |  |  |
Debt Instrument, Frequency of Periodic Payment | semi-annually |  |  |  |
Subordinated debt [Member] | 2029 Bay Banks Notes [Member] | SOFR [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Subordinated debt instrument variable interest rate spread | 4.335% |  |  |  |
Subordinated debt [Member] | 2029 Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Subordinated debt instrument maturity date | Oct. 15, 2029 |  |  |  |
Subordinated notes, net |  |  |  | $ 25,000,000 |
Debt instrument carrying amount | $ 25,200,000 |  |  |  |
Debt Instrument, Unamortized Premium | $ 678,000 |  |  |  |
Effective interest rate | 5.08% | 4.73% |  |  |
Unsecured Lines of Credit [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maximum overnight line of credit facilities available | $ 28,000,000.0 | $ 44,000,000.0 |  |  |
Overnight line of credit facilities outstanding | $ 0 | 0 |  |  |
FHLB [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Federal home loan bank advances, maximum borrowing capacity percentage on assets | 30.00% |  |  |  |
Line of creidt | $ 525,100,000 |  |  |  |
Federal home loan bank advance | $ 311,700,000 | $ 10,100,000 |  |  |
Federal home loan bank, advances, interest Rate | 4.57% | 0.56% |  |  |
Subordinated debt instrument maturity date | May 08, 2023 | Feb. 28, 2030 |  |  |
FHLB [Member] | Restricted Equity Investments [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Federal home loan bank stock | $ 14,700,000 | $ 1,700,000 |  |  |
FHLB [Member] | Line of Credit [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Federal home loan bank advance | 128,300,000 |  |  |  |
FHLB [Member] | Line of Credit [Member] | 1-4 Family Residential Loans [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Assets pledged with federal home loan bank against credit facilities | 104,600,000 |  |  |  |
FHLB [Member] | Line of Credit [Member] | Multi-Family Residential Loans [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Assets pledged with federal home loan bank against credit facilities | 42,200,000 |  |  |  |
FHLB [Member] | Line of Credit [Member] | Commercial Real Estate Loans [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Assets pledged with federal home loan bank against credit facilities | 147,100,000 |  |  |  |
FHLB [Member] | Line of Credit [Member] | Securities [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Assets pledged with federal home loan bank against credit facilities | 231,200,000 |  |  |  |
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 | $ 85,100,000 |  |  |  |

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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 Discloses the single interest rate [if] applicable to the advances from the Federal Home Loan Bank, by branch, as of the Balance Sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=123599511&loc=d3e64711-112823 Reference 2: 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 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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