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Loans and Allowance for Credit Losses - Outstanding Balances of Loan (Detail) - USD ($) $ in Thousands | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2021 | Dec. 31, 2020 | Jun. 30, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | $ 6,740,535 | $ 6,761,183 | $ 6,922,075
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] |  |  |
Total | $ 1,374,177 | 1,555,986 | 1,773,099
Commercial, financial, agricultural and other [Member] | Time and Demand Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 1,360,065 | 1,541,382 |
Commercial, financial, agricultural and other [Member] | Commercial Credit Cards |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 14,112 | 14,604 |
Real estate construction [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 414,816 | 427,221 | 416,329
Residential real estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 1,828,783 | 1,750,592 | 1,723,288
Residential real estate [Member] | Senior Lien |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 1,218,300 | 1,144,323 |
Residential real estate [Member] | Junior Lien |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 610,483 | 606,269 |
Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 2,205,758 | 2,211,569 | 2,224,710
Commercial Real Estate [Member] | Multifamily |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 385,905 | 371,239 |
Commercial Real Estate [Member] | Nonowner Occupied Commercial Real Estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 1,429,192 | 1,421,151 |
Commercial Real Estate [Member] | Owner Occupied Commercial Real Estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 390,661 | 419,179 |
Loans to individuals [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 917,001 | 815,815 | $ 784,649
Loans to individuals [Member] | Automobiles |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 829,150 | 712,800 |
Loans to individuals [Member] | Consumer Credit Cards |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 10,834 | 12,360 |
Loans to individuals [Member] | Other Consumer Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | $ 77,017 | $ 90,655 |

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