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Loans and ACL - Summary of Aging Analysis of Amortized Cost of Loans Designated as TLMs (Detail) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Modified in Period, Amount	$ 9,751	$ 7,194
Commercial and Industrial [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Modified in Period, Amount	5,218	3,299
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	3,505	3,036
Residential [Member] | Real Estate Loan [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Modified in Period, Amount	868	694
Consumer loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Modified in Period, Amount	6	10
Current Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Modified in Period, Amount	1,683	940
Current Loans [Member] | Commercial and Industrial [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Modified in Period, Amount	939	554
Current Loans [Member] | Residential Construction [Member] | Real Estate Loan [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Modified in Period, Amount	0	155
Current Loans [Member] | Commercial [Member] | Real Estate Loan [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Modified in Period, Amount	506	37
Current Loans [Member] | Residential [Member] | Real Estate Loan [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Modified in Period, Amount	238	194
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	154	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 Construction [Member] | Real Estate Loan [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Modified in Period, Amount	154	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] | Residential [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 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] | 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] | 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	7,914	6,254
Non Accrual [Member] | Commercial and Industrial [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Modified in Period, Amount	4,279	2,745
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	2,999	2,999
Non Accrual [Member] | Residential [Member] | Real Estate Loan [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Modified in Period, Amount	630	500
Non Accrual [Member] | Consumer loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Modified in Period, Amount	$ 6	$ 10

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