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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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