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Fair Value - Schedule of Fair Value Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
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Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Equity securities | $ 69,880 | $ 52,507
Investment securities available for sale | 6,414,761 | 6,773,712
U.S. Treasury |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investment securities available for sale | 548,126 | 200,927
U.S. government-sponsored entities and agencies |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investment securities available for sale | 1,142,900 | 1,175,080
Mortgage-backed securities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investment securities available for sale | 3,862,705 | 4,369,902
States and political subdivisions |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investment securities available for sale | 544,944 | 663,852
Pooled trust preferred securities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investment securities available for sale | 11,125 | 10,811
Other securities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investment securities available for sale | 304,961 | 353,140
Fair Value on Recurring Basis | Carrying Value |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Equity securities | 69,880 | 52,507
Loans held-for-sale | 122,033 | 11,926
Derivative assets | 227,833 | 169,001
Derivative liabilities | 409,269 | 380,704
Fair Value on Recurring Basis | Carrying Value | U.S. Treasury |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investment securities available for sale | 548,126 | 200,927
Fair Value on Recurring Basis | Carrying Value | U.S. government-sponsored entities and agencies |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investment securities available for sale | 1,142,900 | 1,175,080
Fair Value on Recurring Basis | Carrying Value | Mortgage-backed securities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investment securities available for sale | 3,862,705 | 4,369,902
Fair Value on Recurring Basis | Carrying Value | States and political subdivisions |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investment securities available for sale | 544,944 | 663,852
Fair Value on Recurring Basis | Carrying Value | Pooled trust preferred securities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investment securities available for sale | 11,125 | 10,811
Fair Value on Recurring Basis | Carrying Value | Other securities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investment securities available for sale | 304,961 | 353,140
Fair Value on Recurring Basis | Estimate of Fair Value Measurement | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Equity securities | 69,880 | 52,507
Loans held-for-sale | 0 | 0
Derivative assets | 0 | 0
Derivative liabilities | 0 | 0
Fair Value on Recurring Basis | Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Equity securities | 0 | 0
Loans held-for-sale | 122,033 | 11,926
Derivative assets | 227,833 | 169,001
Derivative liabilities | 409,269 | 380,704
Fair Value on Recurring Basis | Estimate of Fair Value Measurement | Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Equity securities | 0 | 0
Loans held-for-sale | 0 | 0
Derivative assets | 0 | 0
Derivative liabilities | 0 | 0
Fair Value on Recurring Basis | Estimate of Fair Value Measurement | U.S. Treasury | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investment securities available for sale | 548,126 | 200,927
Fair Value on Recurring Basis | Estimate of Fair Value Measurement | U.S. Treasury | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investment securities available for sale | 0 | 0
Fair Value on Recurring Basis | Estimate of Fair Value Measurement | U.S. Treasury | Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investment securities available for sale | 0 | 0
Fair Value on Recurring Basis | Estimate of Fair Value Measurement | U.S. government-sponsored entities and agencies | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investment securities available for sale | 0 | 0
Fair Value on Recurring Basis | Estimate of Fair Value Measurement | U.S. government-sponsored entities and agencies | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investment securities available for sale | 1,142,900 | 1,175,080
Fair Value on Recurring Basis | Estimate of Fair Value Measurement | U.S. government-sponsored entities and agencies | Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investment securities available for sale | 0 | 0
Fair Value on Recurring Basis | Estimate of Fair Value Measurement | Mortgage-backed securities | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investment securities available for sale | 0 | 0
Fair Value on Recurring Basis | Estimate of Fair Value Measurement | Mortgage-backed securities | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investment securities available for sale | 3,862,705 | 4,369,902
Fair Value on Recurring Basis | Estimate of Fair Value Measurement | Mortgage-backed securities | Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investment securities available for sale | 0 | 0
Fair Value on Recurring Basis | Estimate of Fair Value Measurement | States and political subdivisions | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investment securities available for sale | 0 | 0
Fair Value on Recurring Basis | Estimate of Fair Value Measurement | States and political subdivisions | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investment securities available for sale | 544,944 | 663,852
Fair Value on Recurring Basis | Estimate of Fair Value Measurement | States and political subdivisions | Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investment securities available for sale | 0 | 0
Fair Value on Recurring Basis | Estimate of Fair Value Measurement | Pooled trust preferred securities | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investment securities available for sale | 0 | 0
Fair Value on Recurring Basis | Estimate of Fair Value Measurement | Pooled trust preferred securities | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investment securities available for sale | 11,125 | 10,811
Fair Value on Recurring Basis | Estimate of Fair Value Measurement | Pooled trust preferred securities | Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investment securities available for sale | 0 | 0
Fair Value on Recurring Basis | Estimate of Fair Value Measurement | Other securities | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investment securities available for sale | 0 | 0
Fair Value on Recurring Basis | Estimate of Fair Value Measurement | Other securities | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investment securities available for sale | 304,961 | 353,140
Fair Value on Recurring Basis | Estimate of Fair Value Measurement | Other securities | Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investment securities available for sale | $ 0 | $ 0

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