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Loans and Allowance for Credit Losses - Outstanding Balances of Loan (Detail) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021 | Sep. 30, 2021
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income | $ (7,348,917) | $ (6,839,230) | $ (6,732,580)
Commercial, financial, agricultural and other [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income | (1,169,206) | (1,173,452) | (1,224,591)
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 | (1,012,169) | (1,159,524) | (1,210,694)
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 | (13,368) | (13,928) | (13,897)
Commercial, financial, agricultural and other [Member] | Equipment Finance |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income | (43,777) |  |
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 | (99,892) |  |
Real estate construction [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income | (422,690) | (494,456) | (424,016)
Real estate construction [Member] | Construction Other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income | (326,539) |  |
Real estate construction [Member] | Construction Residential |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income | (96,151) |  |
Residential real estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income | (2,153,904) | (1,920,250) | (1,875,375)
Residential real estate [Member] | Senior Lien |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income | (1,510,570) | (1,299,534) | (1,254,142)
Residential real estate [Member] | Junior Lien |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income | (643,334) | (620,716) | (621,233)
Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income | (2,393,276) | (2,251,097) | (2,231,890)
Commercial Real Estate [Member] | Multifamily |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income | (404,328) | (385,432) | (405,720)
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 | (1,516,255) | (1,465,247) | (1,442,845)
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 | (472,693) | (400,418) | (383,325)
Loans to individuals [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income | (1,209,841) | (999,975) | (976,708)
Loans to individuals [Member] | Automobiles |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income | (1,120,838) | (901,280) | (886,367)
Loans to individuals [Member] | Consumer Credit Cards |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income | (10,274) | (11,151) | (10,617)
Loans to individuals [Member] | Other Consumer Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income | $ (78,729) | $ (87,544) | $ (79,724)

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