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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | $ 14,390 | $ 31,875
Available for sale securities | 7,128,277 | 11,976,514
Derivative Assets, Fair Value | 50,470 | 57,680
Derivative Liabilities, Fair Value | 131,294 | 13,944
Securities sold not yet purchased | 4,000 | 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 | 6,110 | 5,985
Available for sale securities | 1,102,763 | 387,020
Significant Other Observable Inputs (Level 2) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 8,280 | 25,890
Available for sale securities | 6,025,514 | 11,589,494
U.S. Treasury [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale securities | 736,612 | 69,174
U.S. Agencies [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale securities | 171,659 | 124,932
Mortgage-backed [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale securities | 4,109,568 | 7,965,055
State and political subdivisions [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale securities | 1,426,539 | 3,422,688
Corporates [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale securities | 366,151 | 317,846
Fair Value Measurement, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 14,390 | 31,875
Available for sale securities | 7,128,277 | 11,976,514
Equity securities with readily determinable fair values | 28,182 | 64,149
Company-owned life insurance | 56,748 | 65,245
Bank-owned life insurance | 507,241 | 498,373
Derivative Assets, Fair Value | 50,470 | 57,680
Total | 7,785,308 | 12,693,836
Derivative Liabilities, Fair Value | 131,294 | 13,944
Securities sold not yet purchased | 4,018 | 3,197
Total | 135,312 | 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 | 519 | 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 | 317,748 | 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 | 6,110 | 5,985
Available for sale securities | 1,102,763 | 387,020
Equity securities with readily determinable fair values | 28,182 | 64,149
Total | 1,137,055 | 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 | 519 | 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 | 8,280 | 25,890
Available for sale securities | 6,025,514 | 11,589,494
Company-owned life insurance | 56,748 | 65,245
Bank-owned life insurance | 507,241 | 498,373
Derivative Assets, Fair Value | 50,470 | 57,680
Total | 6,648,253 | 12,236,682
Derivative Liabilities, Fair Value | 131,294 | 13,944
Securities sold not yet purchased | 4,018 | 3,197
Total | 135,312 | 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 | 317,748 | 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 | 574 | 1,625
Available for sale securities | 736,612 | 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 | 574 | 1,625
Available for sale securities | 736,612 | 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 | 994 | 2,159
Available for sale securities | 171,659 | 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 | 994 | 2,159
Available for sale securities | 171,659 | 124,932
Fair Value Measurement, Recurring [Member] | Mortgage-backed [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 2,376 | 2,060
Available for sale securities | 4,109,568 | 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 | 2,376 | 2,060
Available for sale securities | 4,109,568 | 7,965,055
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 | 4,910 | 21,671
Available for sale securities | 1,426,539 | 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 | 4,910 | 21,671
Available for sale securities | 1,426,539 | 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 | 5,017 | 4,000
Available for sale securities | 366,151 | 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 | 5,017 | 4,000
Available for sale securities | $ 366,151 | $ 317,846

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