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Fair Value of Financial Instruments (Details) - USD ($)
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Dec. 31, 2023
Assets, Fair Value Disclosure [Abstract]        
Servicing Asset at Fair Value, Amount $ 11,215,000 $ 11,812,000 $ 11,854,000 $ 0
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]        
Servicing Asset 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 1,452,300,000   1,405,478,000  
U.S. Government agency securities 204,607,000   214,066,000  
Mortgage-backed securities 2,412,725,000   1,962,359,000  
State and municipal securities 1,547,902,000   1,506,557,000  
Agency-backed securities 222,000   45,338,000  
Corporate notes and other 332,421,000   448,571,000  
Total investment securities available-for-sale 5,950,177,000   5,582,369,000  
Other Investments 214,440,000   198,721,000  
Servicing Asset at Fair Value, Amount 11,215,000   11,854,000  
Other assets 171,410,000   177,100,000  
Total assets at fair value 6,347,242,000   5,970,044,000  
Liabilities at fair value: [Abstract]        
Other liabilities 70,186,000   98,311,000  
Total liabilities at fair value 70,186,000   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 $ 12,841,000    
Recurring | Quoted market prices in an active market (Level 1)        
Assets, Fair Value Disclosure [Abstract]        
U.S. Treasury securities 0   0  
U.S. Government agency securities 0   0  
Mortgage-backed securities 0   0  
State and municipal securities 0   0  
Agency-backed securities 0   0  
Corporate notes and other 0   0  
Total investment securities available-for-sale 0   0  
Other Investments 0   0  
Servicing Asset at Fair Value, Amount 0   0  
Other assets 0   0  
Total assets at fair value 0   0  
Liabilities at fair value: [Abstract]        
Other liabilities 0   0  
Total liabilities at fair value 0   0  
Recurring | Models with significant observable market parameters (Level 2)        
Assets, Fair Value Disclosure [Abstract]        
U.S. Treasury securities 1,452,300,000   1,405,478,000  
U.S. Government agency securities 204,607,000   214,066,000  
Mortgage-backed securities 2,412,725,000   1,962,359,000  
State and municipal securities 1,547,730,000   1,506,222,000  
Agency-backed securities 222,000   45,338,000  
Corporate notes and other 319,520,000   435,682,000  
Total investment securities available-for-sale 5,937,104,000   5,569,145,000  
Other Investments 22,495,000   22,170,000  
Servicing Asset at Fair Value, Amount 0   0  
Other assets 171,410,000   177,100,000  
Total assets at fair value 6,131,009,000   5,768,415,000  
Liabilities at fair value: [Abstract]        
Other liabilities 70,186,000   98,311,000  
Total liabilities at fair value 70,186,000   98,311,000  
Recurring | Models with significant unobservable market parameters (Level 3)        
Assets, Fair Value Disclosure [Abstract]        
U.S. Treasury securities 0   0  
U.S. Government agency securities 0   0  
Mortgage-backed securities 0   0  
State and municipal securities 172,000   335,000  
Agency-backed securities 0   0  
Corporate notes and other 12,901,000   12,889,000  
Total investment securities available-for-sale 13,073,000   13,224,000  
Other Investments 191,945,000   176,551,000  
Servicing Asset at Fair Value, Amount 11,215,000   11,854,000  
Other assets 0   0  
Total assets at fair value 216,233,000   201,629,000  
Liabilities at fair value: [Abstract]        
Other liabilities 0   0  
Total liabilities at fair value 0   0  
Nonrecurring        
Assets, Fair Value Disclosure [Abstract]        
Total assets at fair value 117,161,000   85,551,000  
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]        
Other real estate owned 3,638,000   1,278,000  
Financing Receivable, Collateral Dependent [1] 113,523,000   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  
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]        
Other real estate owned 0   0  
Financing Receivable, Collateral Dependent [1] 0   0  
Nonrecurring | Models with significant observable market parameters (Level 2)        
Assets, Fair Value Disclosure [Abstract]        
Total assets at fair value 0   0  
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]        
Other real estate owned 0   0  
Financing Receivable, Collateral Dependent [1] 0   0  
Nonrecurring | Models with significant unobservable market parameters (Level 3)        
Assets, Fair Value Disclosure [Abstract]        
Total assets at fair value 117,161,000   85,551,000  
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]        
Other real estate owned 3,638,000   1,278,000  
Financing Receivable, Collateral Dependent [1] $ 113,523,000   $ 84,273,000  
[1] The carrying values of collateral dependent loans at March 31, 2025 and December 31, 2024 are net of valuation allowances of $51.8 million and $54.7 million, respectively.