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Loans and Allowance for Credit Losses - Outstanding Balances of Loan (Detail) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021 | Jun. 30, 2021
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income | $ (7,119,754) | $ (6,839,230) | $ (6,740,535)
Commercial, financial, agricultural and other [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income | (1,170,583) | (1,173,452) | (1,374,177)
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 | (1,031,930) | (1,159,524) | (1,360,065)
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 | (16,329) | (13,928) | (14,112)
Commercial, financial, agricultural and other [Member] | Equipment Finance |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income | (21,062) |  |
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 | (101,262) |  |
Real estate construction [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income | (392,992) | (494,456) | (414,816)
Real estate construction [Member] | Construction Other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income | (292,400) |  |
Real estate construction [Member] | Construction Residential |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income | (100,592) |  |
Residential real estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income | (2,100,201) | (1,920,250) | (1,828,783)
Residential real estate [Member] | Senior Lien |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income | (1,459,861) | (1,299,534) | (1,218,300)
Residential real estate [Member] | Junior Lien |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income | (640,340) | (620,716) | (610,483)
Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income | (2,319,094) | (2,251,097) | (2,205,758)
Commercial Real Estate [Member] | Multifamily |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income | (360,335) | (385,432) | (385,905)
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 | (1,510,804) | (1,465,247) | (1,429,192)
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 | (447,955) | (400,418) | (390,661)
Loans to individuals [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income | (1,136,884) | (999,975) | (917,001)
Loans to individuals [Member] | Automobiles |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income | (1,047,104) | (901,280) | (829,150)
Loans to individuals [Member] | Consumer Credit Cards |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income | (8,717) | (11,151) | (10,834)
Loans to individuals [Member] | Other Consumer Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income | $ (81,063) | $ (87,544) | $ (77,017)

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