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Fair Value - Schedule of Fair Value Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Equity securities | $ 12,427 | $ 2,547
Total investment securities - available-for-sale | 7,027,950 | 5,970,115
U.S. Treasury |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total investment securities - available-for-sale | 240,577 | 10,208
U.S. government-sponsored entities and agencies |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total investment securities - available-for-sale | 1,562,696 | 841,988
Mortgage-backed securities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total investment securities - available-for-sale | 3,354,701 | 3,339,098
States and political subdivisions |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total investment securities - available-for-sale | 1,609,283 | 1,492,162
Pooled trust preferred securities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total investment securities - available-for-sale | 9,367 | 7,913
Other securities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total investment securities - available-for-sale | 251,326 | 278,746
Fair Value on Recurring Basis | Carrying Value |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Equity securities | 12,427 | 2,547
Residential loans held for sale | 51,306 | 63,250
Derivative assets | 98,987 | 140,201
Derivative liabilities | 27,283 | 18,187
Fair Value on Recurring Basis | Carrying Value | U.S. Treasury |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total investment securities - available-for-sale | 240,577 | 10,208
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] |  |
Total investment securities - available-for-sale | 1,562,696 | 841,988
Fair Value on Recurring Basis | Carrying Value | Mortgage-backed securities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total investment securities - available-for-sale | 3,354,701 | 3,339,098
Fair Value on Recurring Basis | Carrying Value | States and political subdivisions |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total investment securities - available-for-sale | 1,609,283 | 1,492,162
Fair Value on Recurring Basis | Carrying Value | Pooled trust preferred securities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total investment securities - available-for-sale | 9,367 | 7,913
Fair Value on Recurring Basis | Carrying Value | Other securities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total investment securities - available-for-sale | 251,326 | 278,746
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 | 12,427 | 2,547
Residential 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
Residential loans held for sale | 51,306 | 63,250
Derivative assets | 98,987 | 140,201
Derivative liabilities | 27,283 | 18,187
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
Residential 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] |  |
Total investment securities - available-for-sale | 240,577 | 10,208
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] |  |
Total 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] |  |
Total 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] |  |
Total 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] |  |
Total investment securities - available-for-sale | 1,562,696 | 841,988
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] |  |
Total 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] |  |
Total 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] |  |
Total investment securities - available-for-sale | 3,354,701 | 3,339,098
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] |  |
Total 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] |  |
Total 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] |  |
Total investment securities - available-for-sale | 1,609,283 | 1,492,162
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] |  |
Total 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] |  |
Total 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] |  |
Total investment securities - available-for-sale | 0 | 0
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] |  |
Total investment securities - available-for-sale | 9,367 | 7,913
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] |  |
Total 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] |  |
Total investment securities - available-for-sale | 251,326 | 278,746
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] |  |
Total investment securities - available-for-sale | $ 0 | $ 0

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