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Allowance for Credit Losses (Impairment By Loan Class) (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Loan loss allowances, impaired financing receivable, evaluated individually or collectively    
Loans Individually Evaluated for Impairment, Recorded Investment $ 47,061 $ 51,830
Loans Individually Evaluated for Impairment, Allowance 12,291 2,445
Loans Collectively Evaluated for Impairment, Recorded Investment 8,011,900 7,378,773
Loans Collectively Evaluated for Impairment, Allowance 144,778 123,527
Commercial, financial and agricultural | Domestic | Commercial.    
Loan loss allowances, impaired financing receivable, evaluated individually or collectively    
Loans Individually Evaluated for Impairment, Recorded Investment 30,872 30,747
Loans Individually Evaluated for Impairment, Allowance 7,971 2,375
Loans Collectively Evaluated for Impairment, Recorded Investment 1,597,358 1,468,006
Loans Collectively Evaluated for Impairment, Allowance 27,579 24,353
Commercial, financial and agricultural | Domestic | Commercial real estate: farmland & commercial    
Loan loss allowances, impaired financing receivable, evaluated individually or collectively    
Loans Individually Evaluated for Impairment, Recorded Investment 299 94
Loans Collectively Evaluated for Impairment, Recorded Investment 2,793,254 2,568,025
Loans Collectively Evaluated for Impairment, Allowance 42,703 36,474
Commercial, financial and agricultural | Domestic | Commercial real estate: multifamily    
Loan loss allowances, impaired financing receivable, evaluated individually or collectively    
Loans Individually Evaluated for Impairment, Recorded Investment 96 117
Loans Collectively Evaluated for Impairment, Recorded Investment 380,743 306,384
Loans Collectively Evaluated for Impairment, Allowance 5,088 3,794
Obligations of states and political subdivisions | Domestic | Commercial Real Estate: other construction and land development    
Loan loss allowances, impaired financing receivable, evaluated individually or collectively    
Loans Individually Evaluated for Impairment, Recorded Investment 15,701 20,483
Loans Individually Evaluated for Impairment, Allowance 4,320 70
Loans Collectively Evaluated for Impairment, Recorded Investment 2,075,921 1,969,186
Loans Collectively Evaluated for Impairment, Allowance 50,971 44,614
Real estate - mortgage | Domestic | Residential: first lien    
Loan loss allowances, impaired financing receivable, evaluated individually or collectively    
Loans Individually Evaluated for Impairment, Recorded Investment 93 77
Loans Collectively Evaluated for Impairment, Recorded Investment 477,940 425,647
Loans Collectively Evaluated for Impairment, Allowance 5,812 4,759
Real estate - mortgage | Domestic | Residential Junior Lien    
Loan loss allowances, impaired financing receivable, evaluated individually or collectively    
Loans Individually Evaluated for Impairment, Recorded Investment   312
Loans Collectively Evaluated for Impairment, Recorded Investment 460,868 439,958
Loans Collectively Evaluated for Impairment, Allowance 11,024 8,284
Consumer | Domestic    
Loan loss allowances, impaired financing receivable, evaluated individually or collectively    
Loans Collectively Evaluated for Impairment, Recorded Investment 45,121 41,592
Loans Collectively Evaluated for Impairment, Allowance 318 281
Foreign. | Foreign    
Loan loss allowances, impaired financing receivable, evaluated individually or collectively    
Loans Collectively Evaluated for Impairment, Recorded Investment 180,695 159,975
Loans Collectively Evaluated for Impairment, Allowance $ 1,283 $ 968