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Fair Value of Financial Instruments (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Assets, Fair Value Disclosure [Abstract]              
Servicing Asset at Fair Value, Amount $ 10,958,000   $ 10,958,000   $ 11,301,000   $ 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 1,431,557,000   1,431,557,000       893,412,000
U.S. Government agency securities 220,803,000   220,803,000       262,730,000
Mortgage-backed securities 1,654,357,000   1,654,357,000       947,390,000
State and municipal securities 1,496,432,000   1,496,432,000       1,585,895,000
Agency-backed securities 128,612,000   128,612,000       191,635,000
Corporate notes and other 459,227,000   459,227,000       436,468,000
Total investment securities available-for-sale 5,390,988,000   5,390,988,000       4,317,530,000
Other Investments 193,110,000   193,110,000       179,487,000
Servicing Asset at Fair Value, Amount 10,958,000   10,958,000        
Other assets 152,604,000   152,604,000       197,541,000
Total assets at fair value 5,747,660,000   5,747,660,000       4,694,558,000
Liabilities at fair value: [Abstract]              
Other liabilities 65,635,000   65,635,000       79,068,000
Total liabilities at fair value 65,635,000   65,635,000       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 $ 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 1,431,557,000   1,431,557,000       893,412,000
U.S. Government agency securities 220,803,000   220,803,000       262,730,000
Mortgage-backed securities 1,654,357,000   1,654,357,000       947,390,000
State and municipal securities 1,496,096,000   1,496,096,000       1,585,416,000
Agency-backed securities 128,612,000   128,612,000       191,635,000
Corporate notes and other 446,351,000   446,351,000       436,468,000
Total investment securities available-for-sale 5,377,776,000   5,377,776,000       4,317,051,000
Other Investments 22,854,000   22,854,000       22,347,000
Servicing Asset at Fair Value, Amount 0   0        
Other assets 152,604,000   152,604,000       197,541,000
Total assets at fair value 5,553,234,000   5,553,234,000       4,536,939,000
Liabilities at fair value: [Abstract]              
Other liabilities 65,635,000   65,635,000       79,068,000
Total liabilities at fair value 65,635,000   65,635,000       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 336,000   336,000       479,000
Agency-backed securities 0   0       0
Corporate notes and other 12,876,000   12,876,000       0
Total investment securities available-for-sale 13,212,000   13,212,000       479,000
Other Investments 170,256,000   170,256,000       157,140,000
Servicing Asset at Fair Value, Amount 10,958,000   10,958,000        
Other assets 0   0       0
Total assets at fair value 194,426,000   194,426,000       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 82,201,000   82,201,000       56,104,000
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]              
Other real estate owned 750,000   750,000       3,937,000
Collateral dependent loans (1) [1] 81,451,000   81,451,000       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 82,201,000   82,201,000       56,104,000
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]              
Other real estate owned 750,000   750,000       3,937,000
Collateral dependent loans (1) [1] $ 81,451,000   $ 81,451,000       $ 52,167,000
[1] The carrying values of collateral dependent loans at September 30, 2024 and December 31, 2023 are net of valuation allowances of $43.8 million and $18.6 million, respectively.