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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.