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Allowance for Credit Losses (Aging By Loan Class) (Details) - USD ($)
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Financing receivable recorded investment      
Past due 90 days or Greater and Still Accruing $ 5,597,000 $ 6,132,000 $ 8,642,000
Loans 8,058,961,000 7,430,603,000  
Current      
Financing receivable recorded investment      
Loans 7,995,156,000 7,412,585,000  
Total Past Due      
Financing receivable recorded investment      
Loans 63,805,000 18,018,000  
30 to 59 Days      
Financing receivable recorded investment      
Loans 12,872,000 8,552,000  
60 to 89 Days      
Financing receivable recorded investment      
Loans 5,195,000 2,251,000  
90 Days or Greater      
Financing receivable recorded investment      
Loans 45,738,000 7,215,000  
Commercial, financial and agricultural      
Financing receivable recorded investment      
Loans 4,802,622,000 4,373,373,000  
Commercial, financial and agricultural | Domestic | Commercial.      
Financing receivable recorded investment      
Past due 90 days or Greater and Still Accruing 539,000 59,000  
Loans 1,628,230,000 1,498,754,000  
Commercial, financial and agricultural | Domestic | Commercial. | Current      
Financing receivable recorded investment      
Loans 1,594,022,000 1,495,750,000  
Commercial, financial and agricultural | Domestic | Commercial. | Total Past Due      
Financing receivable recorded investment      
Loans 34,208,000 3,004,000  
Commercial, financial and agricultural | Domestic | Commercial. | 30 to 59 Days      
Financing receivable recorded investment      
Loans 2,387,000 1,732,000  
Commercial, financial and agricultural | Domestic | Commercial. | 60 to 89 Days      
Financing receivable recorded investment      
Loans 1,583,000 258,000  
Commercial, financial and agricultural | Domestic | Commercial. | 90 Days or Greater      
Financing receivable recorded investment      
Loans 30,238,000 1,014,000  
Commercial, financial and agricultural | Domestic | Commercial real estate: farmland & commercial      
Financing receivable recorded investment      
Past due 90 days or Greater and Still Accruing 4,000    
Loans 2,793,553,000 2,568,118,000  
Commercial, financial and agricultural | Domestic | Commercial real estate: farmland & commercial | Current      
Financing receivable recorded investment      
Loans 2,791,665,000 2,566,257,000  
Commercial, financial and agricultural | Domestic | Commercial real estate: farmland & commercial | Total Past Due      
Financing receivable recorded investment      
Loans 1,888,000 1,861,000  
Commercial, financial and agricultural | Domestic | Commercial real estate: farmland & commercial | 30 to 59 Days      
Financing receivable recorded investment      
Loans 1,424,000 1,744,000  
Commercial, financial and agricultural | Domestic | Commercial real estate: farmland & commercial | 60 to 89 Days      
Financing receivable recorded investment      
Loans 371,000 117,000  
Commercial, financial and agricultural | Domestic | Commercial real estate: farmland & commercial | 90 Days or Greater      
Financing receivable recorded investment      
Loans 93,000    
Commercial, financial and agricultural | Domestic | Commercial real estate: multifamily      
Financing receivable recorded investment      
Loans 380,839,000 306,501,000  
Commercial, financial and agricultural | Domestic | Commercial real estate: multifamily | Current      
Financing receivable recorded investment      
Loans 380,140,000 306,501,000  
Commercial, financial and agricultural | Domestic | Commercial real estate: multifamily | Total Past Due      
Financing receivable recorded investment      
Loans 699,000    
Commercial, financial and agricultural | Domestic | Commercial real estate: multifamily | 30 to 59 Days      
Financing receivable recorded investment      
Loans 369,000    
Commercial, financial and agricultural | Domestic | Commercial real estate: multifamily | 60 to 89 Days      
Financing receivable recorded investment      
Loans 330,000    
Obligations of states and political subdivisions      
Financing receivable recorded investment      
Loans 2,091,622,000 1,989,669,000  
Obligations of states and political subdivisions | Domestic | Commercial Real Estate: other construction and land development      
Financing receivable recorded investment      
Loans 2,091,622,000 1,989,669,000  
Obligations of states and political subdivisions | Domestic | Commercial Real Estate: other construction and land development | Current      
Financing receivable recorded investment      
Loans 2,077,917,000 1,988,539,000  
Obligations of states and political subdivisions | Domestic | Commercial Real Estate: other construction and land development | Total Past Due      
Financing receivable recorded investment      
Loans 13,705,000 1,130,000  
Obligations of states and political subdivisions | Domestic | Commercial Real Estate: other construction and land development | 30 to 59 Days      
Financing receivable recorded investment      
Loans 3,460,000 1,130,000  
Obligations of states and political subdivisions | Domestic | Commercial Real Estate: other construction and land development | 90 Days or Greater      
Financing receivable recorded investment      
Loans 10,245,000    
Real estate - mortgage      
Financing receivable recorded investment      
Loans 938,901,000 865,994,000  
Real estate - mortgage | Domestic | Residential: first lien      
Financing receivable recorded investment      
Past due 90 days or Greater and Still Accruing 2,437,000 4,061,000  
Loans 478,032,000 425,724,000  
Real estate - mortgage | Domestic | Residential: first lien | Current      
Financing receivable recorded investment      
Loans 472,236,000 418,444,000  
Real estate - mortgage | Domestic | Residential: first lien | Total Past Due      
Financing receivable recorded investment      
Loans 5,796,000 7,280,000  
Real estate - mortgage | Domestic | Residential: first lien | 30 to 59 Days      
Financing receivable recorded investment      
Loans 1,812,000 2,023,000  
Real estate - mortgage | Domestic | Residential: first lien | 60 to 89 Days      
Financing receivable recorded investment      
Loans 1,439,000 1,068,000  
Real estate - mortgage | Domestic | Residential: first lien | 90 Days or Greater      
Financing receivable recorded investment      
Loans 2,545,000 4,189,000  
Real estate - mortgage | Domestic | Residential Junior Lien      
Financing receivable recorded investment      
Past due 90 days or Greater and Still Accruing 1,701,000 1,717,000  
Loans 460,869,000 440,270,000  
Real estate - mortgage | Domestic | Residential Junior Lien | Current      
Financing receivable recorded investment      
Loans 457,282,000 436,857,000  
Real estate - mortgage | Domestic | Residential Junior Lien | Total Past Due      
Financing receivable recorded investment      
Loans 3,587,000 3,413,000  
Real estate - mortgage | Domestic | Residential Junior Lien | 30 to 59 Days      
Financing receivable recorded investment      
Loans 1,273,000 925,000  
Real estate - mortgage | Domestic | Residential Junior Lien | 60 to 89 Days      
Financing receivable recorded investment      
Loans 613,000 771,000  
Real estate - mortgage | Domestic | Residential Junior Lien | 90 Days or Greater      
Financing receivable recorded investment      
Loans 1,701,000 1,717,000  
Consumer      
Financing receivable recorded investment      
Loans 45,121,000 41,592,000  
Consumer | Domestic      
Financing receivable recorded investment      
Past due 90 days or Greater and Still Accruing 27,000 7,000  
Loans 45,121,000 41,592,000  
Consumer | Domestic | Current      
Financing receivable recorded investment      
Loans 44,820,000 41,290,000  
Consumer | Domestic | Total Past Due      
Financing receivable recorded investment      
Loans 301,000 302,000  
Consumer | Domestic | 30 to 59 Days      
Financing receivable recorded investment      
Loans 263,000 281,000  
Consumer | Domestic | 60 to 89 Days      
Financing receivable recorded investment      
Loans 11,000 14,000  
Consumer | Domestic | 90 Days or Greater      
Financing receivable recorded investment      
Loans 27,000 7,000  
Foreign.      
Financing receivable recorded investment      
Loans 180,695,000 159,975,000  
Foreign. | Foreign      
Financing receivable recorded investment      
Past due 90 days or Greater and Still Accruing 889,000 288,000  
Loans 180,695,000 159,975,000  
Foreign. | Foreign | Current      
Financing receivable recorded investment      
Loans 177,074,000 158,947,000  
Foreign. | Foreign | Total Past Due      
Financing receivable recorded investment      
Loans 3,621,000 1,028,000  
Foreign. | Foreign | 30 to 59 Days      
Financing receivable recorded investment      
Loans 1,884,000 717,000  
Foreign. | Foreign | 60 to 89 Days      
Financing receivable recorded investment      
Loans 848,000 23,000  
Foreign. | Foreign | 90 Days or Greater      
Financing receivable recorded investment      
Loans $ 889,000 $ 288,000