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Borrowings - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Debt Instrument [Line Items]      
Federal home loan bank advance $ 239,100   $ 311,700 [1]
Federal home loan bank stock 11,800   14,700
Subordinated notes, net 39,904   39,920 [1]
Subordinated Notes [Member]      
Debt Instrument [Line Items]      
Subordinated notes, net $ 39,900   39,900
Subordinated Notes [Member] | 2030 Note [Member]      
Debt Instrument [Line Items]      
Subordinated debt instrument maturity date Jun. 01, 2030    
Effective interest rate 6.10% 6.10%  
Unamortized debt issuance cost $ 14,800    
Subordinated Notes [Member] | 2029 Notes [Member]      
Debt Instrument [Line Items]      
Subordinated debt instrument maturity date Oct. 15, 2029    
Debt instrument carrying amount $ 25,200    
Debt instrument, unamortized premium $ 654    
Effective interest rate 5.09% 5.09%  
Unsecured Lines of Credit [Member]      
Debt Instrument [Line Items]      
Maximum overnight line of credit facilities available $ 28,000   28,000
Overnight line of credit facilities outstanding $ 0   0
FHLB [Member]      
Debt Instrument [Line Items]      
Federal home loan bank advances, maximum borrowing capacity percentage on assets 30.00%    
Line of creidt $ 576,800   525,100
Federal home loan bank advance 239,100   311,700
FHLB [Member] | Restricted Equity Investments [Member]      
Debt Instrument [Line Items]      
Federal home loan bank stock 11,800   $ 14,700
FHLB [Member] | Line of Credit [Member]      
Debt Instrument [Line Items]      
Federal home loan bank advance 270,100    
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 67,600    
BTFP [Member]      
Debt Instrument [Line Items]      
Line of creidt $ 29,800    
[1] Derived from audited December 31, 2022 Consolidated Financial Statements.