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Borrowings - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Jun. 30, 2024	Dec. 31, 2024	Dec. 31, 2023	Oct. 31, 2019	May 31, 2015
Debt Instrument [Line Items]
Federal home loan bank advance		$ 150,000	$ 210,000
Federal home loan bank stock		9,400	12,300
Subordinated notes, net		39,789	39,855
Securities available for sale		$ 312,035	321,081
2030 Notes [Member]
Debt Instrument [Line Items]
Stated Interest Rate		6.00%
2029 Notes [Member]
Debt Instrument [Line Items]
Effective interest rate		8.98%
Subordinated debt [Member]
Debt Instrument [Line Items]
Subordinated notes, net		$ 39,800	$ 39,900
Subordinated debt [Member] | 2030 Notes [Member]
Debt Instrument [Line Items]
Subordinated debt instrument maturity date		Jun. 01, 2030
Subordinated notes, net					$ 15,000
Stated Interest Rate		6.00%
Debt instrument, frequency of periodic payment		semi-annually
Effective interest rate		6.08%	6.09%
Subordinated debt instrument variable interest rate spread		5.87%
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]		Secured Overnight Financing Rate [Member]
Unamortized debt issuance cost		$ 14,800	$ 14,800
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 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
Debt instrument carrying amount		$ 25,000
Debt Instrument, Unamortized Premium		$ 478
Effective interest rate		5.92%	5.08%
Federal Reserve Board Bank Term Funding Program [Member]
Debt Instrument [Line Items]
Borrowings available through discount window		$ 105,700	$ 161,000
Repayment of FRB borrowings	$ 65,000
Advance from federal reserve bank		0	0
Amortized cost		18,100
Securities available for sale		16,300
Unsecured Lines of Credit [Member]
Debt Instrument [Line Items]
Maximum overnight line of credit facilities available		10,000	10,000
Securities [Member] | Federal Reserve Board Bank Term Funding Program [Member]
Debt Instrument [Line Items]
Assets pledged with federal home loan bank against credit facilities		14,100
Construction, Commercial and Industrial Loan [Member] | Federal Reserve Board Bank Term Funding Program [Member]
Debt Instrument [Line Items]
Assets pledged with federal home loan bank against credit facilities		$ 91,600
FHLB [Member]
Debt Instrument [Line Items]
Federal home loan bank advances, maximum borrowing capacity percentage on assets		30.00%
Secured facility totaled		$ 696,000
Line of creidt			455,600
Federal home loan bank advance		150,000	210,000
FHLB [Member] | 1-4 Family Residential Loans [Member]
Debt Instrument [Line Items]
Assets pledged with federal home loan bank against credit facilities		276,900
FHLB [Member] | Multi-Family Residential Loans [Member]
Debt Instrument [Line Items]
Assets pledged with federal home loan bank against credit facilities		29,700
FHLB [Member] | Commercial Real Estate Loans [Member]
Debt Instrument [Line Items]
Assets pledged with federal home loan bank against credit facilities		139,900
FHLB [Member] | Securities [Member]
Debt Instrument [Line Items]
Assets pledged with federal home loan bank against credit facilities		249,600
FHLB [Member] | Public Deposits with Treasury Board of Virginia [Member]
Debt Instrument [Line Items]
Line of creidt		51,200	110,100
FHLB [Member] | Restricted Equity Investments [Member]
Debt Instrument [Line Items]
Federal home loan bank stock		9,400	12,300
FHLB [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Federal home loan bank advance		494,900	135,500
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		$ 50,000	$ 110,000

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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.

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