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Loans and ACL - Summary of Aging Analysis of Amortized Cost of TLMs (Detail) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Modified in Period, Amount	$ 9,293	$ 44,060
Commercial and Industrial [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Modified in Period, Amount	3,573	37,112
Residential [Member] | Real Estate Loan [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Modified in Period, Amount	700	706
Residential Construction [Member] | Real Estate Loan [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Modified in Period, Amount	155	155
Commercial [Member] | Real Estate Loan [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Modified in Period, Amount	4,854	6,087
Consumer loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Modified in Period, Amount	11
Current Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Modified in Period, Amount	2,467	1,910
Current Loans [Member] | Commercial and Industrial [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Modified in Period, Amount	335	1,626
Current Loans [Member] | Residential [Member] | Real Estate Loan [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Modified in Period, Amount	196	129
Current Loans [Member] | Residential Construction [Member] | Real Estate Loan [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Modified in Period, Amount	155	155
Current Loans [Member] | Commercial [Member] | Real Estate Loan [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Modified in Period, Amount	1,781	0
Current Loans [Member] | Consumer loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Modified in Period, Amount	0
30-89 Days Past Due [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Modified in Period, Amount	0	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	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	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
30-89 Days Past Due [Member] | Consumer loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Modified in Period, Amount	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
Non Accrual [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Modified in Period, Amount	6,826	42,150
Non Accrual [Member] | Commercial and Industrial [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Modified in Period, Amount	3,238	35,486
Non Accrual [Member] | Residential [Member] | Real Estate Loan [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Modified in Period, Amount	504	577
Non Accrual [Member] | Commercial [Member] | Real Estate Loan [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Modified in Period, Amount	3,074	$ 6,087
Non Accrual [Member] | Consumer loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Modified in Period, Amount	$ 11

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