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Borrowings - Additional Information (Detail) - USD ($) $ in Thousands |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
May 28, 2020 | Nov. 20, 2015 | Sep. 30, 2021 | Sep. 30, 2021 | Dec. 31, 2020 | Jan. 31, 2021
Debt Instrument [Line Items] |  |  |  |  |  |  |
FHLB borrowings |  |  | $ 125,115 | $ 125,115 | $ 115,000 | [1] |
Federal home loan bank stock |  |  | 6,000 | 6,000 | 5,800 |  |
Subordinated notes, net outstanding |  |  | 40,503 | 40,503 | 24,506 | [1] |
Subordinated Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Subordinated notes, net outstanding |  |  | $ 40,500 | $ 40,500 | 24,500 |  |
Subordinated Notes [Member] | 2029 Bay Banks Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Subordinated debt instrument maturity date |  |  |  | Oct. 15, 2029 |  |  |
Debt instrument interest rate stated percentage |  |  | 5.625% | 5.625% |  |  |
Debt Instrument, frequency of periodic payment |  |  |  | semi-annually |  |  |
Debt instrument carrying amount |  |  | $ 25,800 | $ 25,800 |  |  |
Debt instrument, unamortized premium |  |  | $ 830 | $ 830 |  |  |
Effective interest rate |  |  | 4.63% | 4.64% |  |  |
Subordinated Notes [Member] | 2029 Bay Banks Notes [Member] | SOFR [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument basis spread on variable rate1 |  |  |  | 433.50% |  |  |
Subordinated Notes [Member] | 2025 Bay Banks Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Subordinated debt instrument maturity date |  |  |  | May 28, 2025 |  |  |
Debt instrument interest rate stated percentage |  |  | 6.50% | 6.50% |  |  |
Subordinated Notes [Member] | 2030 Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Subordinated debt instrument face value | $ 15,000 |  |  |  |  |  |
Maturity Date | Jun. 01, 2030 |  |  |  |  |  |
Effective interest rate |  |  | 6.12% | 6.12% |  |  |
Unamortized debt issuance cost |  |  | $ 14,700 | $ 14,700 |  |  |
Subordinated Notes [Member] | 2025 Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Subordinated debt instrument face value |  | $ 10,000 |  |  |  |  |
Maturity Date |  | Dec. 01, 2025 |  |  |  |  |
Unsecured Lines of Credit [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum overnight line of credit facilities available |  |  | 64,000 | 64,000 | 38,000 |  |
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 |  |  |  | 35.00% |  |  |
Total advances |  |  | 33,900 | $ 33,900 | $ 281,600 |  |
Federal Reserve Paycheck Protection Program Liquidity [Member] | Minimum [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Borrowing maturity |  |  |  | 6 months | 1 year 2 months 12 days |  |
Federal Reserve Paycheck Protection Program Liquidity [Member] | Maximum [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Borrowing maturity |  |  |  | 3 years 25 days | 4 years 6 months |  |
Bay Banks [Member] | Subordinated Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Subordinated notes, net outstanding |  |  |  |  |  |  | $ 30,900
Subordinated debt instrument face value |  |  |  |  |  |  | 31,900
Bay Banks [Member] | Federal Reserve Paycheck Protection Program Liquidity [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Total advances |  |  |  |  |  |  | 24,800
FHLB [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Federal home loan bank advances, maximum borrowing capacity percentage on assets |  |  |  | 30.00% |  |  |
FHLB borrowings |  |  | 125,100 | $ 125,100 | $ 115,000 |  |
FHLB [Member] | Bay Banks [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Federal home loan, advances assumed |  |  |  |  |  |  | $ 10,100
FHLB [Member] | Restricted Equity Investments [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Federal home loan bank stock |  |  | 6,000 | 6,000 | $ 5,800 |  |
FHLB [Member] | Line of Credit [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Federal home loan bank, advances, general debt obligations, amount available |  |  | 392,200 | 392,200 |  |  |
FHLB borrowings |  |  | 210,200 | 210,200 |  |  |
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 |  |  | 185,500 | 185,500 |  |  |
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 |  |  | 35,000 | 35,000 |  |  |
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 |  |  | 117,300 | 117,300 |  |  |
FHLB [Member] | Line of Credit [Member] | 1-4 Family Residential Loans Held for Sale [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Assets pledged with federal home loan bank against credit facilities |  |  | 27,900 | 27,900 |  |  |
FHLB [Member] | Line of Credit [Member] | Securities [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Assets pledged with federal home loan bank against credit facilities |  |  | 26,500 | 26,500 |  |  |
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 |  |  | $ 57,000 | $ 57,000 |  |  |
[1] | Derived from audited December 31, 2020 Consolidated Financial Statements.

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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 http://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 http://asc.fasb.org/extlink&oid=120400017&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 http://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 http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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