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Allowance for Credit Losses (Impairment By Loan Class) (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Loan loss allowances, impaired financing receivable, evaluated individually or collectively    
Loans Individually Evaluated for Impairment, Recorded Investment $ 42,268 $ 51,830
Loans Individually Evaluated for Impairment, Allowance 3,080 2,445
Loans Collectively Evaluated for Impairment, Recorded Investment 7,530,809 7,378,773
Loans Collectively Evaluated for Impairment, Allowance 137,423 123,527
Commercial, financial and agricultural | Domestic | Commercial.    
Loan loss allowances, impaired financing receivable, evaluated individually or collectively    
Loans Individually Evaluated for Impairment, Recorded Investment 31,312 30,747
Loans Individually Evaluated for Impairment, Allowance 3,010 2,375
Loans Collectively Evaluated for Impairment, Recorded Investment 1,421,885 1,468,006
Loans Collectively Evaluated for Impairment, Allowance 24,635 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 287 94
Loans Collectively Evaluated for Impairment, Recorded Investment 2,518,383 2,568,025
Loans Collectively Evaluated for Impairment, Allowance 38,688 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 108 117
Loans Collectively Evaluated for Impairment, Recorded Investment 308,061 306,384
Loans Collectively Evaluated for Impairment, Allowance 4,106 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 10,173 20,483
Loans Individually Evaluated for Impairment, Allowance 70 70
Loans Collectively Evaluated for Impairment, Recorded Investment 2,192,014 1,969,186
Loans Collectively Evaluated for Impairment, Allowance 52,994 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 70 77
Loans Collectively Evaluated for Impairment, Recorded Investment 418,831 425,647
Loans Collectively Evaluated for Impairment, Allowance 5,092 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 447,208 439,958
Loans Collectively Evaluated for Impairment, Allowance 10,442 8,284
Consumer | Domestic    
Loan loss allowances, impaired financing receivable, evaluated individually or collectively    
Loans Collectively Evaluated for Impairment, Recorded Investment 43,411 41,592
Loans Collectively Evaluated for Impairment, Allowance 286 281
Foreign. | Foreign    
Loan loss allowances, impaired financing receivable, evaluated individually or collectively    
Loans Collectively Evaluated for Impairment, Recorded Investment 181,016 159,975
Loans Collectively Evaluated for Impairment, Allowance $ 1,180 $ 968