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Borrowings - Additional Information (Detail) - USD ($)
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Oct. 31, 2019
May 31, 2015
Debt Instrument [Line Items]          
Federal home loan bank advance $ 150,000,000   $ 150,000,000 [1]    
Federal home loan bank stock 9,100,000   9,400,000    
Subordinated notes, net $ 39,773,000   39,789,000 [1]    
2030 Notes [Member]          
Debt Instrument [Line Items]          
Stated Interest Rate 6.00%        
2029 Notes [Member]          
Debt Instrument [Line Items]          
Effective interest rate 8.64%        
Subordinated debt [Member]          
Debt Instrument [Line Items]          
Subordinated notes, net $ 39,800,000   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
Stated Interest Rate 6.00%        
Debt instrument, frequency of periodic payment semi-annually        
Subordinated debt instrument variable interest rate spread 5.87%        
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate [Member]        
Effective interest rate 6.31% 6.32%      
Unamortized debt issuance cost $ 14,800,000        
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       $ 25,000,000  
Debt instrument carrying amount $ 25,000,000        
Debt instrument, unamortized premium $ 453,000        
Effective interest rate 8.05% 5.22%      
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]          
Borrowings available through discount window 68,500,000   105,700,000    
Advance from federal reserve bank 0   0    
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 $ 68,500,000        
FHLB [Member]          
Debt Instrument [Line Items]          
Federal home loan bank advances, maximum borrowing capacity percentage on assets 30.00%        
Secured facility totaled $ 588,500,000        
Line of credit     696,000,000    
Federal home loan bank advance 150,000,000   150,000,000    
Assets pledged with federal home loan bank against credit facilities 422,800,000        
FHLB [Member] | Securities [Member]          
Debt Instrument [Line Items]          
Assets pledged with federal home loan bank against credit facilities 165,700,000        
FHLB [Member] | Public Deposits with Treasury Board of Virginia [Member]          
Debt Instrument [Line Items]          
Line of credit 51,200,000        
FHLB [Member] | Restricted Equity Investments [Member]          
Debt Instrument [Line Items]          
Federal home loan bank stock 9,100,000   9,400,000    
FHLB [Member] | Line of Credit [Member]          
Debt Instrument [Line Items]          
Federal home loan bank advance $ 387,300,000   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     $ 50,000,000    
[1] Derived from audited December 31, 2024 Consolidated Financial Statements.