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Borrowings - Additional Information (Detail) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Debt Instrument [Line Items] |  |  |  |
Federal home loan bank advance | $ 280,000,000 |  | $ 210,000,000 | [1]
Federal home loan bank stock | 15,600,000 |  | 12,300,000 |
Subordinated notes, net | 39,838,000 |  | 39,855,000 | [1]
Subordinated Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Subordinated notes, net | $ 39,800,000 |  | 39,900,000 |
Subordinated Notes [Member] | 2030 Note [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Subordinated debt instrument maturity date | Jun. 01, 2030 |  |  |
Effective interest rate | 6.09% | 6.10% |  |
Unamortized debt issuance cost | $ 14,800,000 |  |  |
Subordinated Notes [Member] | 2029 Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Subordinated debt instrument maturity date | Oct. 15, 2029 |  |  |
Debt instrument carrying amount | $ 25,100,000 |  |  |
Debt instrument, unamortized premium | $ 553,000 |  |  |
Effective interest rate | 5.22% | 5.09% |  |
Unsecured Lines of Credit [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum overnight line of credit facilities available | $ 10,000,000 |  | 10,000,000 |
Federal Reserve Board Bank Term Funding Program [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity | 101,800,000 |  | 161,000,000 |
Advance from federal reserve bank | 0 |  | 0 |
Borrowings avalible through BTFP | 69,000,000 |  |  |
FRB Borrowings one advance | $ 65,000,000 |  |  |
Maturity date of FRB borrowings | May 10, 2024 |  |  |
Debt instrument interest rate stated percentage | 4.74% |  |  |
FHLB [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Federal home loan bank advances, maximum borrowing capacity percentage on assets | 30.00% |  |  |
Line of creidt | $ 656,500,000 |  | 455,600,000 |
Federal home loan bank advance | 280,000,000 |  | 210,000,000 |
FHLB [Member] | Public Deposits with Treasury Board of Virginia [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of creidt | 111,200,000 |  | 110,100,000 |
FHLB [Member] | Restricted Equity Investments [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Federal home loan bank stock | 15,600,000 | $ 12,300,000 |  |
FHLB [Member] | Line of Credit [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Federal home loan bank advance | 265,400,000 |  | $ 135,500,000 |
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 | $ 110,000,000 |  |  |
[1] | Derived from audited December 31, 2023 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 -Topic 942 -SubTopic 470 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480876/942-470-45-1 + 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://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//1943274/2147479440/944-210-S99-1 Reference 3: 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//1943274/2147479853/942-210-S99-1 + Details
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