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Loans and Allowance for Credit Losses - Modifications Subsequent Default (Detail) $ in Thousands | 9 Months Ended | 12 Months Ended
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Sep. 30, 2024 USD ($) branch | Dec. 31, 2023 USD ($) branch
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | branch | 3,000 | 0
Financing Receivable, Troubled Debt Restructuring, Subsequent Default | $ | $ 259 | $ 0
Commercial, financial, agricultural and other [Member] |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | branch | 2,000 | 0
Financing Receivable, Troubled Debt Restructuring, Subsequent Default | $ | $ 164 | $ 0
Commercial, financial, agricultural and other [Member] | Equipment Finance |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | branch | 2,000 | 0
Financing Receivable, Troubled Debt Restructuring, Subsequent Default | $ | $ 164 | $ 0
Residential real estate [Member] |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | branch | 1,000 | 0
Financing Receivable, Troubled Debt Restructuring, Subsequent Default | $ | $ 95 | $ 0
Residential real estate [Member] | Senior Lien |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | branch | 1,000 | 0
Financing Receivable, Troubled Debt Restructuring, Subsequent Default | $ | $ 95 | $ 0

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- Definition Amortized cost of financing receivable with payment default in current period and modified within previous 12 months preceding payment default for debtor experiencing financial difficulty. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 34 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-34 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 12A -Publisher FASB -URI https://asc.fasb.org/1943274/2147481933/310-10-55-12A Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 44 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-44 + Details
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