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Credit Quality - Schedule of Age Analysis of its Past Due Loans, Segregated by Class of Loans and Leases (Detail) - USD ($) $ in Thousands | Dec. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Loans, Past Due | $ 24,720,620 | $ 21,680,498
Loans, Recorded Investment >90 Days & Accruing | 4,974 | 16,940
30-89 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, Past Due | 55,065 | 83,942
90 Days or more Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, Past Due | 101,466 | 73,400
Total Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, Past Due | 156,531 | 157,342
Current & Other [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, Past Due | 24,564,089 | 21,523,156
Construction & Land Development [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, Past Due | 3,570,902 | 3,509,034
Loans, Recorded Investment >90 Days & Accruing | 0 | 1,677
Construction & Land Development [Member] | 30-89 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, Past Due | 1,508 | 390
Construction & Land Development [Member] | 90 Days or more Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, Past Due | 1,301 | 4,265
Construction & Land Development [Member] | Total Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, Past Due | 2,809 | 4,655
Construction & Land Development [Member] | Current & Other [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, Past Due | 3,568,093 | 3,504,379
Commercial Real Estate [Member] | Owner-Occupied [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, Past Due | 2,145,921 | 1,590,002
Loans, Recorded Investment >90 Days & Accruing | 81 | 0
Commercial Real Estate [Member] | Owner-Occupied [Member] | 30-89 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, Past Due | 4,754 | 3,767
Commercial Real Estate [Member] | Owner-Occupied [Member] | 90 Days or more Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, Past Due | 1,830 | 1,284
Commercial Real Estate [Member] | Owner-Occupied [Member] | Total Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, Past Due | 6,584 | 5,051
Commercial Real Estate [Member] | Owner-Occupied [Member] | Current & Other [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, Past Due | 2,139,337 | 1,584,951
Commercial Real Estate [Member] | Nonowner-Occupied [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, Past Due | 8,343,520 | 6,939,641
Loans, Recorded Investment >90 Days & Accruing | 0 | 0
Commercial Real Estate [Member] | Nonowner-Occupied [Member] | 30-89 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, Past Due | 7,598 | 11,931
Commercial Real Estate [Member] | Nonowner-Occupied [Member] | 90 Days or more Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, Past Due | 71,038 | 23,379
Commercial Real Estate [Member] | Nonowner-Occupied [Member] | Total Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, Past Due | 78,636 | 35,310
Commercial Real Estate [Member] | Nonowner-Occupied [Member] | Current & Other [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, Past Due | 8,264,884 | 6,904,331
Other Commercial [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, Past Due | 3,784,833 | 3,351,362
Loans, Recorded Investment >90 Days & Accruing | 591 | 431
Other Commercial [Member] | 30-89 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, Past Due | 2,490 | 5,594
Other Commercial [Member] | 90 Days or more Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, Past Due | 6,569 | 19,019
Other Commercial [Member] | Total Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, Past Due | 9,059 | 24,613
Other Commercial [Member] | Current & Other [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, Past Due | 3,775,774 | 3,326,749
Residential Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, Past Due | 6,098,262 | 5,507,384
Loans, Recorded Investment >90 Days & Accruing | 3,701 | 12,429
Residential Real Estate [Member] | 30-89 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, Past Due | 25,026 | 33,783
Residential Real Estate [Member] | 90 Days or more Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, Past Due | 19,124 | 20,946
Residential Real Estate [Member] | Total Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, Past Due | 44,150 | 54,729
Residential Real Estate [Member] | Current & Other [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, Past Due | 6,054,112 | 5,452,655
Consumer [Member] | Bankcard [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, Past Due | 9,686 | 9,998
Loans, Recorded Investment >90 Days & Accruing | 54 | 61
Consumer [Member] | Bankcard [Member] | 30-89 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, Past Due | 28 | 63
Consumer [Member] | Bankcard [Member] | 90 Days or more Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, Past Due | 54 | 61
Consumer [Member] | Bankcard [Member] | Total Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, Past Due | 82 | 124
Consumer [Member] | Bankcard [Member] | Current & Other [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, Past Due | 9,604 | 9,874
Consumer [Member] | Other Consumer [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, Past Due | 767,496 | 773,077
Loans, Recorded Investment >90 Days & Accruing | 547 | 2,342
Consumer [Member] | Other Consumer [Member] | 30-89 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, Past Due | 13,661 | 28,414
Consumer [Member] | Other Consumer [Member] | 90 Days or more Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, Past Due | 1,550 | 4,446
Consumer [Member] | Other Consumer [Member] | Total Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, Past Due | 15,211 | 32,860
Consumer [Member] | Other Consumer [Member] | Current & Other [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, Past Due | $ 752,285 | $ 740,217

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