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v3.25.3

Borrowings - Additional Information (Detail) - USD ($) |  |  | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jul. 15, 2025 | Jun. 01, 2025 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024 | May 31, 2020 | Oct. 31, 2019
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Federal home loan bank advance |  |  | $ 150,000,000 |  | $ 150,000,000 |  | $ 150,000,000 | [1] |  |
Federal home loan bank stock |  |  | 9,100,000 |  | 9,100,000 |  | 9,400,000 |  |  |
Subordinated notes, net |  |  | 14,731,000 |  | 14,731,000 |  | 39,789,000 | [1] |  |
2030 Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Redemption of Notes |  | $ 15,000,000 |  |  |  |  |  |  |  |
Debt Instrument, Redemption Period, End Date |  | Jun. 01, 2025 |  |  |  |  |  |  |  |
Effective interest rate |  | 6.00% |  |  |  |  |  |  |  |
Interest Expense, Debt |  |  | 0 | $ 200,000 | $ 400,000 | $ 700,000 |  |  |  |
2029 Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Effective interest rate |  |  |  |  | 8.65% |  |  |  |  |
Partial redemption end date | Jul. 15, 2025 |  |  |  |  |  |  |  |  |
Partial redemption of notes | $ 10,000,000 |  |  |  |  |  |  |  |  |
Subordinated debt [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Subordinated notes, net |  |  | $ 14,700,000 |  | $ 14,700,000 |  | 39,800,000 |  |  |
Subordinated debt [Member] | 2030 Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Subordinated debt instrument maturity date |  |  |  |  | Jun. 01, 2030 |  |  |  |  |
Subordinated notes, net |  |  |  |  |  |  |  |  | $ 15,000,000 |
Subordinated debt [Member] | 2029 Bay Banks Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Stated Interest Rate |  |  | 5.625% |  | 5.625% |  |  |  |  |
Debt instrument, frequency of periodic payment |  |  |  |  | semi-annually |  |  |  |  |
Subordinated debt instrument variable interest rate spread |  |  |  |  | 4.335% |  |  |  |  |
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] |  |  |  |  | Secured Overnight Financing Rate [Member] |  |  |  |  |
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 |  |  | $ 14,700,000 |  | $ 14,700,000 |  |  |  |  |
Debt instrument, unamortized premium |  |  | $ 300,000 |  | $ 300,000 |  |  |  |  |
Effective interest rate |  |  | 7.49% | 5.30% | 7.84% | 5.21% |  |  |  |
Unsecured Lines of Credit [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum overnight line of credit facilities available |  |  | $ 10,000,000 |  | $ 10,000,000 |  | 10,000,000 |  |  |
Federal Reserve Board Bank Term Funding Program [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Borrowings available through discount window |  |  | 75,400,000 |  | 75,400,000 |  | 105,700,000 |  |  |
Advance from federal reserve bank |  |  | 0 |  | $ 0 |  | 0 |  |  |
FHLB [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Federal home loan bank advances, maximum borrowing capacity percentage on assets |  |  |  |  | 30.00% |  |  |  |  |
Secured facility totaled |  |  | 620,900,000 |  | $ 620,900,000 |  |  |  |  |
Line of credit |  |  |  |  |  |  | 696,000,000 |  |  |
Federal home loan bank advance |  |  | 150,000,000 |  | 150,000,000 |  | 150,000,000 |  |  |
Assets pledged with federal home loan bank against credit facilities |  |  | 453,200,000 |  | 453,200,000 |  |  |  |  |
FHLB [Member] | Securities [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Assets pledged with federal home loan bank against credit facilities |  |  | 167,700,000 |  | 167,700,000 |  |  |  |  |
FHLB [Member] | Public Deposits with Treasury Board of Virginia [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit |  |  | 41,200,000 |  | 41,200,000 |  | 51,200,000 |  |  |
FHLB [Member] | Restricted Equity Investments [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Federal home loan bank stock |  |  | 9,100,000 |  | 9,100,000 |  | 9,400,000 |  |  |
FHLB [Member] | Line of Credit [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Federal home loan bank advance |  |  | 429,700,000 |  | 429,700,000 |  | 494,900,000 |  |  |
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 |  |  | $ 40,000,000 |  | $ 40,000,000 |  | $ 50,000,000 |  |  |
[1] | Derived from audited December 31, 2024 Consolidated Financial Statements.

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- Definition Amount of the cost of borrowed funds accounted for as interest expense for debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(8)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 69E -Publisher FASB -URI https://asc.fasb.org/1943274/2147481568/470-20-55-69E Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 69F -Publisher FASB -URI https://asc.fasb.org/1943274/2147481568/470-20-55-69F Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1F -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-1F Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section 45 -Paragraph 3 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479105/946-220-45-3 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-6 + 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 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481544/470-10-50-6 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 15 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-15 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.6-03(i)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479886/946-10-S99-3 + Details
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- Definition Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
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