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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | $ 35,811 | $ 28,533
Available For Sale Securities Debt Securities | 13,378,280 | 7,774,334
Derivative Assets, Fair Value | 299,164 | 234,443
Derivative Liabilities, Fair Value | 144,029 | 107,442
Securities sold not yet purchased | 13,000 | 7,100
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 | 11,825 | 8,695
Available For Sale Securities Debt Securities | 2,420,287 | 1,643,243
Significant Other Observable Inputs (Level 2) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 23,986 | 19,838
Available For Sale Securities Debt Securities | 10,957,993 | 6,131,091
U.S. Treasury [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available For Sale Securities Debt Securities | 2,197,751 | 1,326,073
U.S. Agencies [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available For Sale Securities Debt Securities | 81,426 | 129,047
Mortgage-backed [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available For Sale Securities Debt Securities | 7,842,275 | 4,420,930
State and political subdivisions [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available For Sale Securities Debt Securities | 2,479,502 | 1,218,569
Corporates [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available For Sale Securities Debt Securities | 222,536 | 317,170
Fair Value Measurement, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 35,811 | 28,533
Available For Sale Securities Debt Securities | 13,378,280 | 7,774,334
Equity securities with readily determinable fair values | 41,150 | 11,596
Derivative Assets, Fair Value | 299,164 | 234,443
Total | 13,754,405 | 8,048,906
Derivative Liabilities, Fair Value | 144,029 | 107,442
Securities sold not yet purchased | 12,997 | 7,100
Total | 157,026 | 114,542
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 Debt Securities | 554,790 | 362,545
Fair Value Measurement, Recurring [Member] | Trading - other [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 96 | 140
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 | 11,825 | 8,695
Available For Sale Securities Debt Securities | 2,420,287 | 1,643,243
Equity securities with readily determinable fair values | 41,150 | 11,596
Total | 2,473,262 | 1,663,534
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 | 96 | 140
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 | 23,986 | 19,838
Available For Sale Securities Debt Securities | 10,957,993 | 6,131,091
Derivative Assets, Fair Value | 299,164 | 234,443
Total | 11,281,143 | 6,385,372
Derivative Liabilities, Fair Value | 144,029 | 107,442
Securities sold not yet purchased | 12,997 | 7,100
Total | 157,026 | 114,542
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 Debt Securities | 554,790 | 362,545
Fair Value Measurement, Recurring [Member] | U.S. Treasury [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 1,634 | 1,620
Available For Sale Securities Debt Securities | 2,197,751 | 1,326,073
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 | 1,634 | 1,620
Available For Sale Securities Debt Securities | 2,197,751 | 1,326,073
Fair Value Measurement, Recurring [Member] | U.S. Agencies [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 3,417 | 8,369
Available For Sale Securities Debt Securities | 81,426 | 129,047
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 | 3,417 | 8,369
Available For Sale Securities Debt Securities | 81,426 | 129,047
Fair Value Measurement, Recurring [Member] | Mortgage-backed [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available For Sale Securities Debt Securities | 7,842,275 | 4,420,930
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] |  |
Available For Sale Securities Debt Securities | 7,842,275 | 4,420,930
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 | 20,569 | 11,469
Available For Sale Securities Debt Securities | 2,479,502 | 1,218,569
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 | 20,569 | 11,469
Available For Sale Securities Debt Securities | 2,479,502 | 1,218,569
Fair Value Measurement, Recurring [Member] | Corporates [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 10,095 | 6,935
Available For Sale Securities Debt Securities | 222,536 | 317,170
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 | 10,095 | 6,935
Available For Sale Securities Debt Securities | $ 222,536 | $ 317,170

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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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