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Fair Value of Financial Instruments (Details) - USD ($)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Assets, Fair Value Disclosure [Abstract]    
Other Investments $ 176,600,000 $ 157,100,000
Assets and liabilities measured at fair value on a nonrecurring basis [Abstract]    
Valuation allowance of impaired loans 54,700,000 18,600,000
Servicing Asset at Fair Value, Amount 11,854,000 0
Assets measured on recurring basis, unobservable input reconciliation, calculation [Roll Forward]    
Transfers out of Level 3 1 0
Other Liabilities    
Assets measured on recurring basis, unobservable input reconciliation, calculation [Roll Forward]    
Transfers out of Level 3 0  
Other Assets    
Assets measured on recurring basis, unobservable input reconciliation, calculation [Roll Forward]    
Fair value, beginning of period 157,140,000 130,982,000
Total realized gains included in income 3,153,000 3,112,000
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 0 0
Purchases 32,538,000 32,515,000
Issuances 0 0
Settlements (16,280,000) (9,469,000)
Transfers out of Level 3 0 0
Fair value, December 31 176,551,000 157,140,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 0  
Available-for-sale Securities    
Assets measured on recurring basis, unobservable input reconciliation, calculation [Roll Forward]    
Fair value, beginning of period 479,000 629,000
Total realized gains included in income 52,000 4,000
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 17,000 5,000
Purchases 0 0
Issuances 0 0
Settlements (165,000) (159,000)
Transfers out of Level 3 0 0
Fair value, December 31 13,224,000 479,000
Fair Value, Measurements, Nonrecurring    
Assets, Fair Value Disclosure [Abstract]    
Total assets at fair value 85,551,000 56,104,000
Assets and liabilities measured at fair value on a nonrecurring basis [Abstract]    
Other real estate owned 1,278,000 3,937,000
Loans Receivable, Fair Value Disclosure [1] 84,273,000 52,167,000
Fair Value, Measurements, Nonrecurring | Quoted Market Prices in an Active Market (Level 1)    
Assets, Fair Value Disclosure [Abstract]    
Total assets at fair value 0 0
Assets and liabilities measured at fair value on a nonrecurring basis [Abstract]    
Other real estate owned 0 0
Loans Receivable, Fair Value Disclosure [1] 0 0
Fair Value, Measurements, Nonrecurring | Models with Significant Observable Market Parameters (Level 2)    
Assets, Fair Value Disclosure [Abstract]    
Total assets at fair value 0 0
Assets and liabilities measured at fair value on a nonrecurring basis [Abstract]    
Other real estate owned 0 0
Loans Receivable, Fair Value Disclosure [1] 0 0
Fair Value, Measurements, Nonrecurring | Models with Significant Unobservable Market Parameters (Level 3)    
Assets, Fair Value Disclosure [Abstract]    
Total assets at fair value 85,551,000 56,104,000
Assets and liabilities measured at fair value on a nonrecurring basis [Abstract]    
Other real estate owned 1,278,000 3,937,000
Loans Receivable, Fair Value Disclosure [1] 84,273,000 52,167,000
Fair Value, Measurements, Recurring    
Assets, Fair Value Disclosure [Abstract]    
U.S. treasury securities 1,405,478,000 893,412,000
U.S. government agency securities 214,066,000 262,730,000
Mortgage-backed securities 1,962,359,000 947,390,000
State and municipal securities 1,506,557,000 1,585,895,000
Asset-backed securities 45,338,000 191,635,000
Corporate notes and other, Fair Value Disclosure 448,571,000 436,468,000
Total investment securities available-for-sale 5,582,369,000 4,317,530,000
Other Investments 198,721,000 179,487,000
Other assets 177,100,000 197,541,000
Total assets at fair value 5,970,044,000 4,694,558,000
Liabilities at fair value [Abstract]    
Other liabilities 98,311,000 79,068,000
Total liabilities at fair value 98,311,000 79,068,000
Assets and liabilities measured at fair value on a nonrecurring basis [Abstract]    
Servicing Asset at Fair Value, Amount 11,854,000  
Fair Value, Measurements, 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
Asset-backed securities 0 0
Corporate notes and other, Fair Value Disclosure 0 0
Total investment securities available-for-sale 0 0
Other Investments 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
Assets and liabilities measured at fair value on a nonrecurring basis [Abstract]    
Servicing Asset at Fair Value, Amount 0  
Fair Value, Measurements, Recurring | Models with Significant Observable Market Parameters (Level 2)    
Assets, Fair Value Disclosure [Abstract]    
U.S. treasury securities 1,405,478,000 893,412,000
U.S. government agency securities 214,066,000 262,730,000
Mortgage-backed securities 1,962,359,000 947,390,000
State and municipal securities 1,506,222,000 1,585,416,000
Asset-backed securities 45,338,000 191,635,000
Corporate notes and other, Fair Value Disclosure 435,682,000 436,468,000
Total investment securities available-for-sale 5,569,145,000 4,317,051,000
Other Investments 22,170,000 22,347,000
Other assets 177,100,000 197,541,000
Total assets at fair value 5,768,415,000 4,536,939,000
Liabilities at fair value [Abstract]    
Other liabilities 98,311,000 79,068,000
Total liabilities at fair value 98,311,000 79,068,000
Assets and liabilities measured at fair value on a nonrecurring basis [Abstract]    
Servicing Asset at Fair Value, Amount 0  
Fair Value, Measurements, 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 335,000 479,000
Asset-backed securities 0 0
Corporate notes and other, Fair Value Disclosure 12,889,000 0
Total investment securities available-for-sale 13,224,000 479,000
Other Investments 176,551,000 157,140,000
Other assets 0 0
Total assets at fair value 201,629,000 157,619,000
Liabilities at fair value [Abstract]    
Other liabilities 0 0
Total liabilities at fair value 0 0
Assets and liabilities measured at fair value on a nonrecurring basis [Abstract]    
Servicing Asset at Fair Value, Amount 11,854,000  
Fair Value, Measurements, Recurring | Other Assets    
Assets measured on recurring basis, unobservable input reconciliation, calculation [Roll Forward]    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3   0
Fair Value, Measurements, Recurring | Available-for-sale Securities    
Assets measured on recurring basis, unobservable input reconciliation, calculation [Roll Forward]    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 12,841,000 0
Fair Value, Measurements, Recurring | Servicing Contracts    
Assets measured on recurring basis, unobservable input reconciliation, calculation [Roll Forward]    
Fair value, beginning of period 0  
Total realized gains included in income 11,854,000  
Purchases 0  
Issuances 0  
Fair value, December 31 11,854,000 $ 0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 0  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) 0  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements $ 0  
[1] The carrying values of collateral dependent loans at December 31, 2024 and 2023 are net of valuation allowances of $54.7 million and $18.6 million, respectively.