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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Mar. 31, 2026 | Dec. 31, 2025
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | $ 24,205 | $ 22,331
Available-for-sale securities | 13,660,886 | 13,709,141
Derivative Assets, Fair Value | 266,599 | 281,329
Derivative Liabilities, Fair Value | 146,429 | 136,452
Securities sold not yet purchased | 8,300 | 4,100
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 7,513 | 5,145
Available-for-sale securities | 2,397,394 | 2,497,930
Significant Other Observable Inputs (Level 2) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 16,692 | 17,186
Available-for-sale securities | 11,263,492 | 11,211,211
U.S. Treasury [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities | 2,257,713 | 2,320,815
U.S. Agencies [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities | 49,968 | 62,370
Mortgage-backed [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities | 8,287,873 | 8,167,873
State and political subdivisions [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities | 2,371,456 | 2,446,588
Corporates [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities | 139,681 | 177,115
Fair Value Measurement, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 24,205 | 22,331
Available-for-sale securities | 13,660,886 | 13,709,141
Equity securities with readily determinable fair values | 12,604 | 14,690
Derivative Assets, Fair Value | 266,599 | 281,329
Total | 13,964,294 | 14,027,491
Derivative Liabilities, Fair Value | 146,429 | 136,452
Securities sold not yet purchased | 8,290 | 4,052
Total | 154,719 | 140,504
Fair Value Measurement, Recurring [Member] | Collateralized loan obligations [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities | 554,195 | 534,380
Fair Value Measurement, Recurring [Member] | Trading - other [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 427 | 317
Fair Value Measurement, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 7,513 | 5,145
Available-for-sale securities | 2,397,394 | 2,497,930
Equity securities with readily determinable fair values | 12,604 | 14,690
Total | 2,417,511 | 2,517,765
Fair Value Measurement, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Trading - other [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 427 | 317
Fair Value Measurement, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 16,692 | 17,186
Available-for-sale securities | 11,263,492 | 11,211,211
Derivative Assets, Fair Value | 266,599 | 281,329
Total | 11,546,783 | 11,509,726
Derivative Liabilities, Fair Value | 146,429 | 136,452
Securities sold not yet purchased | 8,290 | 4,052
Total | 154,719 | 140,504
Fair Value Measurement, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Collateralized loan obligations [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities | 554,195 | 534,380
Fair Value Measurement, Recurring [Member] | U.S. Treasury [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities |  | 2,636
Available-for-sale securities | 2,257,713 | 2,320,815
Fair Value Measurement, Recurring [Member] | U.S. Treasury [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities |  | 2,636
Available-for-sale securities | 2,257,713 | 2,320,815
Fair Value Measurement, Recurring [Member] | U.S. Agencies [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 5,397 | 62,370
Available-for-sale securities | 49,968 | 13,489
Fair Value Measurement, Recurring [Member] | U.S. Agencies [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 5,397 | 62,370
Available-for-sale securities | 49,968 | 13,489
Fair Value Measurement, Recurring [Member] | Mortgage-backed [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 5,172 |
Available-for-sale securities | 8,287,873 | 8,167,873
Fair Value Measurement, Recurring [Member] | Mortgage-backed [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 5,172 |
Available-for-sale securities | 8,287,873 | 8,167,873
Fair Value Measurement, Recurring [Member] | State and political subdivisions [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 6,123 | 3,697
Available-for-sale securities | 2,371,456 | 2,446,588
Fair Value Measurement, Recurring [Member] | State and political subdivisions [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 6,123 | 3,697
Available-for-sale securities | 2,371,456 | 2,446,588
Fair Value Measurement, Recurring [Member] | Corporates [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 7,086 | 2,192
Available-for-sale securities | 139,681 | 177,115
Fair Value Measurement, Recurring [Member] | Corporates [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 7,086 | 2,192
Available-for-sale securities | $ 139,681 | $ 177,115

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- Definition Fair value portion of arrangements with third parties, including, but not limited to, operating lease arrangement and arrangement in which the entity has agreed to expend funds to procure goods or services, or has agreed to commit resources to supply goods or services. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2E -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2E Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(25)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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