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Fair Value of Financial Instruments (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2024 | Jun. 30, 2023 | Mar. 31, 2024 | Dec. 31, 2023
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |
Servicing Asset at Fair Value, Amount |  | $ 11,301,000 | $ 11,301,000 |  | $ 11,812,000 | $ 0
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |
Servicing Asset |  | 0 | 0 |  | $ 11,812,000 |
Available-for-sale Securities |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 |  |  | 1 |  |  |
Recurring |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |
U.S. Treasury securities |  | 1,392,208,000 | 1,392,208,000 |  |  | 893,412,000
U.S. Government agency securities |  | 239,055,000 | 239,055,000 |  |  | 262,730,000
Mortgage-backed securities |  | 1,390,181,000 | 1,390,181,000 |  |  | 947,390,000
State and municipal securities |  | 1,311,800,000 | 1,311,800,000 |  |  | 1,585,895,000
Agency-backed securities |  | 128,087,000 | 128,087,000 |  |  | 191,635,000
Corporate notes and other |  | 447,636,000 | 447,636,000 |  |  | 436,468,000
Total investment securities available-for-sale |  | 4,908,967,000 | 4,908,967,000 |  |  | 4,317,530,000
Other Investments |  | 190,370,000 | 190,370,000 |  |  | 179,487,000
Servicing Asset at Fair Value, Amount |  | 11,301,000 | 11,301,000 |  |  |
Other assets |  | 208,228,000 | 208,228,000 |  |  | 197,541,000
Total assets at fair value |  | 5,318,866,000 | 5,318,866,000 |  |  | 4,694,558,000
Liabilities at fair value: [Abstract] |  |  |  |  |  |
Other liabilities |  | 121,243,000 | 121,243,000 |  |  | 79,068,000
Total liabilities at fair value |  | 121,243,000 | 121,243,000 |  |  | 79,068,000
Recurring | Available-for-sale Securities |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 |  | 0 | 12,841,000 | $ 0 |  |
Recurring | Quoted market prices in an active market (Level 1) |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |
U.S. Treasury securities |  | 0 | 0 |  |  | 0
U.S. Government agency securities |  | 0 | 0 |  |  | 0
Mortgage-backed securities |  | 0 | 0 |  |  | 0
State and municipal securities |  | 0 | 0 |  |  | 0
Agency-backed securities |  | 0 | 0 |  |  | 0
Corporate notes and other |  | 0 | 0 |  |  | 0
Total investment securities available-for-sale |  | 0 | 0 |  |  | 0
Other Investments |  | 0 | 0 |  |  | 0
Servicing Asset at Fair Value, Amount |  | 0 | 0 |  |  |
Other assets |  | 0 | 0 |  |  | 0
Total assets at fair value |  | 0 | 0 |  |  | 0
Liabilities at fair value: [Abstract] |  |  |  |  |  |
Other liabilities |  | 0 | 0 |  |  | 0
Total liabilities at fair value |  | 0 | 0 |  |  | 0
Recurring | Models with significant observable market parameters (Level 2) |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |
U.S. Treasury securities |  | 1,392,208,000 | 1,392,208,000 |  |  | 893,412,000
U.S. Government agency securities |  | 239,055,000 | 239,055,000 |  |  | 262,730,000
Mortgage-backed securities |  | 1,390,181,000 | 1,390,181,000 |  |  | 947,390,000
State and municipal securities |  | 1,298,603,000 | 1,298,603,000 |  |  | 1,585,416,000
Agency-backed securities |  | 128,087,000 | 128,087,000 |  |  | 191,635,000
Corporate notes and other |  | 447,636,000 | 447,636,000 |  |  | 436,468,000
Total investment securities available-for-sale |  | 4,895,770,000 | 4,895,770,000 |  |  | 4,317,051,000
Other Investments |  | 22,058,000 | 22,058,000 |  |  | 22,347,000
Servicing Asset at Fair Value, Amount |  | 0 | 0 |  |  |
Other assets |  | 208,228,000 | 208,228,000 |  |  | 197,541,000
Total assets at fair value |  | 5,126,056,000 | 5,126,056,000 |  |  | 4,536,939,000
Liabilities at fair value: [Abstract] |  |  |  |  |  |
Other liabilities |  | 121,243,000 | 121,243,000 |  |  | 79,068,000
Total liabilities at fair value |  | 121,243,000 | 121,243,000 |  |  | 79,068,000
Recurring | Models with significant unobservable market parameters (Level 3) |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |
U.S. Treasury securities |  | 0 | 0 |  |  | 0
U.S. Government agency securities |  | 0 | 0 |  |  | 0
Mortgage-backed securities |  | 0 | 0 |  |  | 0
State and municipal securities |  | 13,197,000 | 13,197,000 |  |  | 479,000
Agency-backed securities |  | 0 | 0 |  |  | 0
Corporate notes and other |  | 0 | 0 |  |  | 0
Total investment securities available-for-sale |  | 13,197,000 | 13,197,000 |  |  | 479,000
Other Investments |  | 168,312,000 | 168,312,000 |  |  | 157,140,000
Servicing Asset at Fair Value, Amount |  | 11,301,000 | 11,301,000 |  |  |
Other assets |  | 0 | 0 |  |  | 0
Total assets at fair value |  | 192,810,000 | 192,810,000 |  |  | 157,619,000
Liabilities at fair value: [Abstract] |  |  |  |  |  |
Other liabilities |  | 0 | 0 |  |  | 0
Total liabilities at fair value |  | 0 | 0 |  |  | 0
Nonrecurring |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |
Total assets at fair value |  | 89,947,000 | 89,947,000 |  |  | 56,104,000
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |
Other real estate owned |  | 2,636,000 | 2,636,000 |  |  | 3,937,000
Collateral dependent loans (1) | [1] | 87,311,000 | 87,311,000 |  |  | 52,167,000
Nonrecurring | Quoted market prices in an active market (Level 1) |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |
Total assets at fair value |  | 0 | 0 |  |  | 0
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |
Other real estate owned |  | 0 | 0 |  |  | 0
Collateral dependent loans (1) | [1] | 0 | 0 |  |  | 0
Nonrecurring | Models with significant observable market parameters (Level 2) |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |
Total assets at fair value |  | 0 | 0 |  |  | 0
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |
Other real estate owned |  | 0 | 0 |  |  | 0
Collateral dependent loans (1) | [1] | 0 | 0 |  |  | 0
Nonrecurring | Models with significant unobservable market parameters (Level 3) |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |
Total assets at fair value |  | 89,947,000 | 89,947,000 |  |  | 56,104,000
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |
Other real estate owned |  | 2,636,000 | 2,636,000 |  |  | 3,937,000
Collateral dependent loans (1) | [1] | $ 87,311,000 | $ 87,311,000 |  |  | $ 52,167,000
[1] | The carrying values of collateral dependent loans at June 30, 2024 and December 31, 2023 are net of valuation allowances of $42.7 million and $18.6 million, respectively.

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