v3.26.1
Loans, ACL, and OREO - Additional Information (Detail)
3 Months Ended 12 Months Ended
Jan. 01, 2026
USD ($)
Mar. 31, 2026
USD ($)
Loan
Mar. 31, 2025
USD ($)
Dec. 31, 2025
USD ($)
Loans and Leases Receivable Disclosure [Line Items]        
Interest income from nonaccrual loans   $ 0 $ 200,000  
Accrued interest excluded from ACL   9,300,000   $ 9,100,000
Loans pledged   1,832,676,000   1,864,512,000
Current period gross charge-offs revolving   1,622,000    
Recorded investment of PCD Loans   28,900,000   29,800,000
Recorded investment, estimated allowance for credit loss   200,000   200,000
Recorded investment, PCD Discount (Premium)   1,900,000   2,000,000
Amount of special mention loan   $ 300,000    
Amount of remove the special mention loan $ 1,000,000      
Loan amount evaluated $ 33,900,000      
Number of residential mortgage loans in the process of foreclosure | Loan   8    
Mortgage loans with total amortized cost   $ 2,900,000    
Other liabilities   18,345,000   19,209,000 [1]
Carrying value of the OREO portfolio   $ 1,300,000   1,300,000
Guaranteed Portion of the Loan Owned By U.S. Small Business Administration   90.00%    
Unfunded commitments   $ 0   0
Small Business Administration Loans [Member]        
Loans and Leases Receivable Disclosure [Line Items]        
Other liabilities   1,200,000   1,200,000
Commercial and Residential Mortgages Loans [Member] | Asset Pledged as Collateral without Right [Member] | Federal Home Loan Bank Advances [Member]        
Loans and Leases Receivable Disclosure [Line Items]        
Loans pledged   665,700,000   695,100,000
Commercial and Industrial [Member]        
Loans and Leases Receivable Disclosure [Line Items]        
Loans pledged   264,004,000   271,158,000
Current period gross charge-offs revolving   1,530,000    
Commercial and Industrial [Member] | Asset Pledged as Collateral without Right [Member] | FRB [Member]        
Loans and Leases Receivable Disclosure [Line Items]        
Loans pledged   $ 71,100,000   $ 72,800,000
[1] Derived from audited December 31, 2025 Consolidated Financial Statements.