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Loans and Allowance for Credit Losses - Outstanding Balances of Loan (Detail) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2024 | Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Net of Deferred Income | $ (8,965,500) | $ (8,968,761)
Default Status Of TDRs After Number Of Days Past Due | 90 days |
Commercial, financial, agricultural and other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Net of Deferred Income | $ (1,629,535) | (1,543,349)
Commercial, financial, agricultural and other [Member] | Time and Demand Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Net of Deferred Income | (1,141,477) | (1,187,300)
Commercial, financial, agricultural and other [Member] | Commercial Credit Cards |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Net of Deferred Income | (12,405) | (12,906)
Commercial, financial, agricultural and other [Member] | Equipment Finance |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Net of Deferred Income | (366,527) | (232,944)
Commercial, financial, agricultural and other [Member] | Time and Demand Loans Other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Net of Deferred Income | (109,126) | (110,199)
Real estate construction [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Net of Deferred Income | (540,775) | (597,735)
Real estate construction [Member] | Construction Other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Net of Deferred Income | (522,548) | (541,633)
Real estate construction [Member] | Construction Residential |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Net of Deferred Income | (18,227) | (56,102)
Residential real estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Net of Deferred Income | (2,374,376) | (2,416,876)
Residential real estate [Member] | Senior Lien |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Net of Deferred Income | (1,698,863) | (1,739,107)
Residential real estate [Member] | Junior Lien |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Net of Deferred Income | (675,513) | (677,769)
Commercial Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Net of Deferred Income | (3,069,438) | (3,053,152)
Commercial Real Estate [Member] | Multifamily |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Net of Deferred Income | (540,427) | (551,142)
Commercial Real Estate [Member] | Nonowner Occupied Commercial Real Estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Net of Deferred Income | (1,803,084) | (1,772,785)
Commercial Real Estate [Member] | Owner Occupied Commercial Real Estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Net of Deferred Income | (725,927) | (729,225)
Loans to individuals [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Net of Deferred Income | (1,351,376) | (1,357,649)
Loans to individuals [Member] | Automobiles |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Net of Deferred Income | (1,275,765) | (1,277,969)
Loans to individuals [Member] | Consumer Credit Cards |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Net of Deferred Income | (9,610) | (10,291)
Loans to individuals [Member] | Other Consumer Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Net of Deferred Income | $ (66,001) | $ (69,389)

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