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Loans and ACL - Summary of Aging Analysis of Amortized Cost of TLMs (Detail) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Modified in Period, Amount	$ 10,997	$ 8,930
Commercial and Industrial [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Modified in Period, Amount	5,247	3,299
Residential [Member] | Real Estate Loan [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Modified in Period, Amount	826	694
Residential Construction [Member] | Real Estate Loan [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Modified in Period, Amount	154	155
Commercial [Member] | Real Estate Loan [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Modified in Period, Amount	4,761	4,772
Consumer loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Modified in Period, Amount	9	10
Current Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Modified in Period, Amount	2,844	2,676
Current Loans [Member] | Commercial and Industrial [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Modified in Period, Amount	734	554
Current Loans [Member] | Residential [Member] | Real Estate Loan [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Modified in Period, Amount	192	194
Current Loans [Member] | Residential Construction [Member] | Real Estate Loan [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Modified in Period, Amount	154	155
Current Loans [Member] | Commercial [Member] | Real Estate Loan [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Modified in Period, Amount	1,764	1,773
Current Loans [Member] | Consumer loans [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	141	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] | Residential [Member] | Real Estate Loan [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Modified in Period, Amount	141	0
30-89 Days Past Due [Member] | Residential Construction [Member] | Real Estate Loan [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 Loan [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Modified in Period, Amount	0	0
30-89 Days Past Due [Member] | Consumer loans [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] | Residential [Member] | Real Estate Loan [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 Construction [Member] | Real Estate Loan [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 Loan [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 loans [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	8,012	6,254
Non Accrual [Member] | Commercial and Industrial [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Modified in Period, Amount	4,513	2,745
Non Accrual [Member] | Residential [Member] | Real Estate Loan [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Modified in Period, Amount	493	500
Non Accrual [Member] | Residential Construction [Member] | Real Estate Loan [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Modified in Period, Amount	0	0
Non Accrual [Member] | Commercial [Member] | Real Estate Loan [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Modified in Period, Amount	2,997	2,999
Non Accrual [Member] | Consumer loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Modified in Period, Amount	$ 9	$ 10

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