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v3.21.1

Borrowings - Additional Information (Detail) | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2021 USD ($) Advance | Jun. 30, 2020 | Dec. 31, 2020 USD ($) Advance | Jan. 31, 2021 USD ($) Advance | May 28, 2020 USD ($) | Mar. 31, 2020 | Nov. 20, 2015 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
FHLB borrowings | $ 183,122,000 |  | $ 115,000,000 | [1] |  |  |  |
Federal home loan bank stock | 8,200,000 |  | 5,800,000 |  |  |  |  |
Subordinated notes, net outstanding | 54,588,000 |  | 24,506,000 | [1] |  |  |  |
Subordinated Notes [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Subordinated notes, net outstanding | $ 54,600,000 |  | 24,500,000 |  |  |  |  |
Subordinated debt instrument face value |  |  |  |  |  | $ 15,000,000 |  | $ 10,000,000
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% |  |  |  |  |  |  |
Maturity Date | Oct. 14, 2024 |  |  |  |  |  |  |
Debt Instrument, frequency of periodic payment | semi-annually |  |  |  |  |  |  |
Debt instrument carrying amount | $ 25,400,000 |  |  |  |  |  |  |
Debt instrument, unamortized premium | $ 855,000 |  |  |  |  |  |  |
Effective interest rate | 4.74% |  |  |  |  |  |  |
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% |  |  |  |  |  |  |
Debt instrument carrying amount | $ 6,500,000 |  |  |  |  |  |  |
Debt instrument, unamortized premium | $ 60,000 |  |  |  |  |  |  |
Effective interest rate | 4.84% |  |  |  |  |  |  |
Subordinated Notes [Member] | 2030 Notes [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Effective interest rate | 6.13% |  |  |  |  |  |  |
Unamortized debt issuance cost |  |  |  |  |  | $ 14,700,000 |  |
Subordinated Notes [Member] | 2025 Notes [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Effective interest rate | 5.56% |  |  |  |  |  | 6.88% |
Unamortized debt issuance cost |  |  |  |  |  |  |  | $ 8,000,000
Unsecured Lines of Credit [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maximum overnight line of credit facilities available | $ 79,000,000 |  | 38,000,000 |  |  |  |  |
Overnight line of credit facilities outstanding | $ 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% |  |  |  |  |  |
Number of advances | Advance | 77 |  | 23 |  |  |  |  |
Total advances | $ 509,700,000 |  | $ 281,600,000 |  |  |  |  |
Federal Reserve Paycheck Protection Program Liquidity [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Borrowing maturity | 1 year |  | 1 year 2 months 12 days |  |  |  |  |
Federal Reserve Paycheck Protection Program Liquidity [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Borrowing maturity | 4 years 10 months 24 days |  | 4 years 6 months |  |  |  |  |
Bay Banks [Member] | Subordinated Notes [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Subordinated notes, net outstanding |  |  |  |  | $ 30,900,000 |  |  |
Subordinated debt instrument face value |  |  |  |  | $ 31,900,000 |  |  |
Bay Banks [Member] | Federal Reserve Paycheck Protection Program Liquidity [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Number of advances | Advance |  |  |  |  | 6 |  |  |
Total advances |  |  |  |  | $ 24,800,000 |  |  |
FHLB [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Federal home loan bank advances, maximum borrowing capacity percentage on assets | 30.00% |  |  |  |  |  |  |
FHLB borrowings | $ 183,100,000 |  | $ 115,000,000 |  |  |  |  |
FHLB [Member] | Bay Banks [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Federal home loan, advances assumed |  |  |  |  | $ 10,100,000 |  |  |
FHLB [Member] | Restricted Equity Investments [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Federal home loan bank stock | 8,200,000 |  |  |  |  |  |  |
FHLB [Member] | Line of Credit [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Federal home loan bank, advances, general debt obligations, amount available | 426,800,000 |  |  |  |  |  |  |
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 | 229,300,000 |  |  |  |  |  |  |
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 | 34,400,000 |  |  |  |  |  |  |
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 | 117,300,000 |  |  |  |  |  |  |
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 | 23,300,000 |  |  |  |  |  |  |
FHLB [Member] | Line of Credit [Member] | Securities [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Assets pledged with federal home loan bank against credit facilities | 22,600,000 |  |  |  |  |  |  |
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 | $ 59,000,000 |  |  |  |  |  |  |
[1] | Derived from audited December 31, 2020 Consolidated Financial Statements.

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