v3.26.1
Loans and ACL - Summary of Aging Analysis of Amortized Cost of Loans Designated as TLMs (Detail) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Loans and Leases Receivable Disclosure [Line Items]    
Financing Receivable, Modified in Period, Amount $ 6,020 $ 5,950
Commercial and Industrial [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Financing Receivable, Modified in Period, Amount 3,167 4,580
Commercial [Member] | Real Estate [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Financing Receivable, Modified in Period, Amount 495 501
Residential [Member] | Real Estate [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Financing Receivable, Modified in Period, Amount 2,353 863
Consumer [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Financing Receivable, Modified in Period, Amount 5 6
Current Loans [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Financing Receivable, Modified in Period, Amount 1,762 3,007
Current Loans [Member] | Commercial and Industrial [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Financing Receivable, Modified in Period, Amount 1,035 2,270
Current Loans [Member] | Commercial [Member] | Real Estate [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Financing Receivable, Modified in Period, Amount 495 501
Current Loans [Member] | Residential [Member] | Real Estate [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Financing Receivable, Modified in Period, Amount 232 236
Current Loans [Member] | Consumer [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Financing Receivable, Modified in Period, Amount 0 0
30-89 Days Past Due [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Financing Receivable, Modified in Period, Amount 1,503 0
30-89 Days Past Due [Member] | Commercial and Industrial [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Financing Receivable, Modified in Period, Amount 0 0
30-89 Days Past Due [Member] | Commercial [Member] | Real Estate [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Financing Receivable, Modified in Period, Amount 0 0
30-89 Days Past Due [Member] | Residential [Member] | Real Estate [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Financing Receivable, Modified in Period, Amount 1,503 0
30-89 Days Past Due [Member] | Consumer [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Financing Receivable, Modified in Period, Amount 0 0
Greater than 90 Days Past Due & Accruing [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Financing Receivable, Modified in Period, Amount 0 0
Greater than 90 Days Past Due & Accruing [Member] | Commercial and Industrial [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Financing Receivable, Modified in Period, Amount 0 0
Greater than 90 Days Past Due & Accruing [Member] | Commercial [Member] | Real Estate [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Financing Receivable, Modified in Period, Amount 0 0
Greater than 90 Days Past Due & Accruing [Member] | Residential [Member] | Real Estate [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Financing Receivable, Modified in Period, Amount 0 0
Greater than 90 Days Past Due & Accruing [Member] | Consumer [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Financing Receivable, Modified in Period, Amount 0 0
Non Accrual [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Financing Receivable, Modified in Period, Amount 2,755 2,943
Non Accrual [Member] | Commercial and Industrial [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Financing Receivable, Modified in Period, Amount 2,132 2,310
Non Accrual [Member] | Commercial [Member] | Real Estate [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Financing Receivable, Modified in Period, Amount 0 0
Non Accrual [Member] | Residential [Member] | Real Estate [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Financing Receivable, Modified in Period, Amount 618 627
Non Accrual [Member] | Consumer [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Financing Receivable, Modified in Period, Amount $ 5 $ 6