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Allowance for Credit Losses (Impairment By Loan Class) (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Loan loss allowances, impaired financing receivable, evaluated individually or collectively    
Loans Individually Evaluated for Impairment, Recorded Investment $ 42,177 $ 51,830
Loans Individually Evaluated for Impairment, Allowance 7,651 2,445
Loans Collectively Evaluated for Impairment, Recorded Investment 7,854,722 7,378,773
Loans Collectively Evaluated for Impairment, Allowance 141,355 123,527
Commercial, financial and agricultural | Domestic | Commercial.    
Loan loss allowances, impaired financing receivable, evaluated individually or collectively    
Loans Individually Evaluated for Impairment, Recorded Investment 31,269 30,747
Loans Individually Evaluated for Impairment, Allowance 7,581 2,375
Loans Collectively Evaluated for Impairment, Recorded Investment 1,525,558 1,468,006
Loans Collectively Evaluated for Impairment, Allowance 26,272 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 298 94
Loans Collectively Evaluated for Impairment, Recorded Investment 2,746,375 2,568,025
Loans Collectively Evaluated for Impairment, Allowance 41,884 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 100 117
Loans Collectively Evaluated for Impairment, Recorded Investment 333,570 306,384
Loans Collectively Evaluated for Impairment, Allowance 4,528 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 10,087 20,483
Loans Individually Evaluated for Impairment, Allowance 70 70
Loans Collectively Evaluated for Impairment, Recorded Investment 2,116,215 1,969,186
Loans Collectively Evaluated for Impairment, Allowance 51,027 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 105 77
Loans Collectively Evaluated for Impairment, Recorded Investment 456,292 425,647
Loans Collectively Evaluated for Impairment, Allowance 5,537 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 318 312
Loans Collectively Evaluated for Impairment, Recorded Investment 450,900 439,958
Loans Collectively Evaluated for Impairment, Allowance 10,593 8,284
Consumer | Domestic    
Loan loss allowances, impaired financing receivable, evaluated individually or collectively    
Loans Collectively Evaluated for Impairment, Recorded Investment 44,767 41,592
Loans Collectively Evaluated for Impairment, Allowance 298 281
Foreign. | Foreign    
Loan loss allowances, impaired financing receivable, evaluated individually or collectively    
Loans Collectively Evaluated for Impairment, Recorded Investment 181,045 159,975
Loans Collectively Evaluated for Impairment, Allowance $ 1,216 $ 968