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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | $ 9,646 | $ 31,875
Available for sale securities | 7,739,216 | 11,976,514
Derivative Assets, Fair Value | 23,626 | 57,680
Derivative Liabilities, Fair Value | 71,268 | 13,944
Securities sold not yet purchased | 1,300 | 3,200
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 | 3,749 | 5,985
Available for sale securities | 1,134,537 | 387,020
Significant Other Observable Inputs (Level 2) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 5,897 | 25,890
Available for sale securities | 6,604,679 | 11,589,494
U.S. Treasury [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale securities | 750,752 | 69,174
U.S. Agencies [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale securities | 175,247 | 124,932
State and political subdivisions [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale securities | 1,662,375 | 3,422,688
Corporates [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale securities | 383,785 | 317,846
Mortgage-backed [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale securities | 4,486,585 | 7,965,055
Fair Value Measurement, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 9,646 | 31,875
Available for sale securities | 7,739,216 | 11,976,514
Equity securities with readily determinable fair values | 40,639 | 64,149
Company-owned life insurance | 54,413 | 65,245
Bank-owned life insurance | 504,250 | 498,373
Derivative Assets, Fair Value | 23,626 | 57,680
Total | 8,371,790 | 12,693,836
Derivative Liabilities, Fair Value | 71,268 | 13,944
Securities sold not yet purchased | 1,282 | 3,197
Total | 72,550 | 17,141
Fair Value Measurement, Recurring [Member] | Trading - other [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 413 | 360
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 | 280,472 | 76,819
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 | 3,749 | 5,985
Available for sale securities | 1,134,537 | 387,020
Equity securities with readily determinable fair values | 40,639 | 64,149
Total | 1,178,925 | 457,154
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 | 413 | 360
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 | 5,897 | 25,890
Available for sale securities | 6,604,679 | 11,589,494
Company-owned life insurance | 54,413 | 65,245
Bank-owned life insurance | 504,250 | 498,373
Derivative Assets, Fair Value | 23,626 | 57,680
Total | 7,192,865 | 12,236,682
Derivative Liabilities, Fair Value | 71,268 | 13,944
Securities sold not yet purchased | 1,282 | 3,197
Total | 72,550 | 17,141
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 | 280,472 | 76,819
Fair Value Measurement, Recurring [Member] | U.S. Treasury [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 593 | 1,625
Available for sale securities | 750,752 | 69,174
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 | 593 | 1,625
Available for sale securities | 750,752 | 69,174
Fair Value Measurement, Recurring [Member] | U.S. Agencies [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities |  | 2,159
Available for sale securities | 175,247 | 124,932
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 |  | 2,159
Available for sale securities | 175,247 | 124,932
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 | 5,897 | 21,671
Available for sale securities | 1,662,375 | 3,422,688
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 | 5,897 | 21,671
Available for sale securities | 1,662,375 | 3,422,688
Fair Value Measurement, Recurring [Member] | Corporates [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 2,743 | 4,000
Available for sale securities | 383,785 | 317,846
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 | 2,743 | 4,000
Available for sale securities | 383,785 | 317,846
Fair Value Measurement, Recurring [Member] | Mortgage-backed [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities |  | 2,060
Available for sale securities | 4,486,585 | 7,965,055
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 |  | 2,060
Available for sale securities | $ 4,486,585 | $ 7,965,055

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