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Fair Value of Financial Instruments (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Jun. 30, 2025 | Dec. 31, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |
Servicing Asset at Fair Value, Amount |  | $ 10,684,000 | $ 10,958,000 | $ 10,684,000 | $ 10,958,000 | $ 10,903,000 | $ 11,854,000 | $ 11,301,000 |  | $ 0
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |
Servicing Asset |  | 0 | 0 | 0 | 0 |  |  | $ 11,812,000 | $ 11,800,000 |
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 |  | 1,593,558,000 |  | 1,593,558,000 |  |  | 1,405,478,000 |  |  |
U.S. Government agency securities |  | 203,816,000 |  | 203,816,000 |  |  | 214,066,000 |  |  |
Mortgage-backed securities |  | 2,618,190,000 |  | 2,618,190,000 |  |  | 1,962,359,000 |  |  |
State and municipal securities |  | 1,690,538,000 |  | 1,690,538,000 |  |  | 1,506,557,000 |  |  |
Agency-backed securities |  | 195,000 |  | 195,000 |  |  | 45,338,000 |  |  |
Corporate notes and other |  | 305,509,000 |  | 305,509,000 |  |  | 448,571,000 |  |  |
Total investment securities available-for-sale |  | 6,411,806,000 |  | 6,411,806,000 |  |  | 5,582,369,000 |  |  |
Other Investments |  | 238,395,000 |  | 238,395,000 |  |  | 198,721,000 |  |  |
Servicing Asset at Fair Value, Amount |  | 10,684,000 |  | 10,684,000 |  |  | 11,854,000 |  |  |
Other assets |  | 203,557,000 |  | 203,557,000 |  |  | 177,100,000 |  |  |
Total assets at fair value |  | 6,864,442,000 |  | 6,864,442,000 |  |  | 5,970,044,000 |  |  |
Liabilities at fair value: [Abstract] |  |  |  |  |  |  |  |  |  |
Other liabilities |  | 78,561,000 |  | 78,561,000 |  |  | 98,311,000 |  |  |
Total liabilities at fair value |  | 78,561,000 |  | 78,561,000 |  |  | 98,311,000 |  |  |
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 | $ 0 | 0 | $ 12,841,000 |  |  |  |  |
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 |  |  | 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 |  | 1,593,558,000 |  | 1,593,558,000 |  |  | 1,405,478,000 |  |  |
U.S. Government agency securities |  | 203,816,000 |  | 203,816,000 |  |  | 214,066,000 |  |  |
Mortgage-backed securities |  | 2,618,190,000 |  | 2,618,190,000 |  |  | 1,962,359,000 |  |  |
State and municipal securities |  | 1,690,538,000 |  | 1,690,538,000 |  |  | 1,506,222,000 |  |  |
Agency-backed securities |  | 195,000 |  | 195,000 |  |  | 45,338,000 |  |  |
Corporate notes and other |  | 292,582,000 |  | 292,582,000 |  |  | 435,682,000 |  |  |
Total investment securities available-for-sale |  | 6,398,879,000 |  | 6,398,879,000 |  |  | 5,569,145,000 |  |  |
Other Investments |  | 22,750,000 |  | 22,750,000 |  |  | 22,170,000 |  |  |
Servicing Asset at Fair Value, Amount |  | 0 |  | 0 |  |  | 0 |  |  |
Other assets |  | 203,557,000 |  | 203,557,000 |  |  | 177,100,000 |  |  |
Total assets at fair value |  | 6,625,186,000 |  | 6,625,186,000 |  |  | 5,768,415,000 |  |  |
Liabilities at fair value: [Abstract] |  |  |  |  |  |  |  |  |  |
Other liabilities |  | 78,561,000 |  | 78,561,000 |  |  | 98,311,000 |  |  |
Total liabilities at fair value |  | 78,561,000 |  | 78,561,000 |  |  | 98,311,000 |  |  |
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 |  | 0 |  | 0 |  |  | 335,000 |  |  |
Agency-backed securities |  | 0 |  | 0 |  |  | 0 |  |  |
Corporate notes and other |  | 12,927,000 |  | 12,927,000 |  |  | 12,889,000 |  |  |
Total investment securities available-for-sale |  | 12,927,000 |  | 12,927,000 |  |  | 13,224,000 |  |  |
Other Investments |  | 215,645,000 |  | 215,645,000 |  |  | 176,551,000 |  |  |
Servicing Asset at Fair Value, Amount |  | 10,684,000 |  | 10,684,000 |  |  | 11,854,000 |  |  |
Other assets |  | 0 |  | 0 |  |  | 0 |  |  |
Total assets at fair value |  | 239,256,000 |  | 239,256,000 |  |  | 201,629,000 |  |  |
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 |  | 118,359,000 |  | 118,359,000 |  |  | 85,551,000 |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |
Other real estate owned |  | 5,129,000 |  | 5,129,000 |  |  | 1,278,000 |  |  |
Financing Receivable, Collateral Dependent | [1] | 113,230,000 |  | 113,230,000 |  |  | 84,273,000 |  |  |
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 |  |  |
Financing Receivable, Collateral Dependent | [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 |  |  |
Financing Receivable, Collateral Dependent | [1] | 0 |  | 0 |  |  | 0 |  |  |
Nonrecurring | Models with significant unobservable market parameters (Level 3) |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |
Total assets at fair value |  | 118,359,000 |  | 118,359,000 |  |  | 85,551,000 |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |
Other real estate owned |  | 5,129,000 |  | 5,129,000 |  |  | 1,278,000 |  |  |
Financing Receivable, Collateral Dependent | [1] | $ 113,230,000 |  | $ 113,230,000 |  |  | $ 84,273,000 |  |  |
[1] | The carrying values of collateral dependent loans at September 30, 2025 and December 31, 2024 are net of valuation allowances of $34.5 million and $54.7 million, respectively.

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