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Allowance for Credit Losses (Aging By Loan Class) (Details) - USD ($)
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Financing receivable recorded investment      
Past due 90 days or Greater and Still Accruing $ 8,642,000 $ 8,238,000 $ 59,705,000
Loans 7,209,151,000 7,541,754,000  
Current      
Financing receivable recorded investment      
Loans 7,171,688,000 7,503,496,000  
Total Past Due      
Financing receivable recorded investment      
Loans 37,463,000 38,258,000  
30 to 59 Days      
Financing receivable recorded investment      
Loans 25,836,000 9,307,000  
60 to 89 Days      
Financing receivable recorded investment      
Loans 2,456,000 3,606,000  
90 Days or Greater      
Financing receivable recorded investment      
Loans 9,171,000 25,345,000  
Commercial, financial and agricultural      
Financing receivable recorded investment      
Loans 4,497,444,000 4,516,288,000  
Commercial, financial and agricultural | Domestic | Commercial.      
Financing receivable recorded investment      
Past due 90 days or Greater and Still Accruing 577,000 318,000  
Loans 1,501,852,000 1,785,936,000  
Commercial, financial and agricultural | Domestic | Commercial. | Current      
Financing receivable recorded investment      
Loans 1,498,438,000 1,782,333,000  
Commercial, financial and agricultural | Domestic | Commercial. | Total Past Due      
Financing receivable recorded investment      
Loans 3,414,000 3,603,000  
Commercial, financial and agricultural | Domestic | Commercial. | 30 to 59 Days      
Financing receivable recorded investment      
Loans 2,534,000 1,931,000  
Commercial, financial and agricultural | Domestic | Commercial. | 60 to 89 Days      
Financing receivable recorded investment      
Loans 303,000 1,109,000  
Commercial, financial and agricultural | Domestic | Commercial. | 90 Days or Greater      
Financing receivable recorded investment      
Loans 577,000 563,000  
Commercial, financial and agricultural | Domestic | Commercial real estate: farmland & commercial      
Financing receivable recorded investment      
Past due 90 days or Greater and Still Accruing 307,000 186,000  
Loans 2,711,056,000 2,289,308,000  
Commercial, financial and agricultural | Domestic | Commercial real estate: farmland & commercial | Current      
Financing receivable recorded investment      
Loans 2,692,076,000 2,286,468,000  
Commercial, financial and agricultural | Domestic | Commercial real estate: farmland & commercial | Total Past Due      
Financing receivable recorded investment      
Loans 18,980,000 2,840,000  
Commercial, financial and agricultural | Domestic | Commercial real estate: farmland & commercial | 30 to 59 Days      
Financing receivable recorded investment      
Loans 18,164,000 2,435,000  
Commercial, financial and agricultural | Domestic | Commercial real estate: farmland & commercial | 60 to 89 Days      
Financing receivable recorded investment      
Loans 172,000 219,000  
Commercial, financial and agricultural | Domestic | Commercial real estate: farmland & commercial | 90 Days or Greater      
Financing receivable recorded investment      
Loans 644,000 186,000  
Commercial, financial and agricultural | Domestic | Commercial real estate: multifamily      
Financing receivable recorded investment      
Loans 284,536,000 441,044,000  
Commercial, financial and agricultural | Domestic | Commercial real estate: multifamily | Current      
Financing receivable recorded investment      
Loans 284,536,000 440,918,000  
Commercial, financial and agricultural | Domestic | Commercial real estate: multifamily | Total Past Due      
Financing receivable recorded investment      
Loans   126,000  
Commercial, financial and agricultural | Domestic | Commercial real estate: multifamily | 30 to 59 Days      
Financing receivable recorded investment      
Loans   126,000  
Obligations of states and political subdivisions      
Financing receivable recorded investment      
Loans 1,668,113,000 1,846,757,000  
Obligations of states and political subdivisions | Domestic | Commercial Real Estate: other construction and land development      
Financing receivable recorded investment      
Past due 90 days or Greater and Still Accruing 188,000    
Loans 1,668,113,000 1,846,757,000  
Obligations of states and political subdivisions | Domestic | Commercial Real Estate: other construction and land development | Current      
Financing receivable recorded investment      
Loans 1,667,092,000 1,828,257,000  
Obligations of states and political subdivisions | Domestic | Commercial Real Estate: other construction and land development | Total Past Due      
Financing receivable recorded investment      
Loans 1,021,000 18,500,000  
Obligations of states and political subdivisions | Domestic | Commercial Real Estate: other construction and land development | 30 to 59 Days      
Financing receivable recorded investment      
Loans 499,000 1,059,000  
Obligations of states and political subdivisions | Domestic | Commercial Real Estate: other construction and land development | 60 to 89 Days      
Financing receivable recorded investment      
Loans 334,000 854,000  
Obligations of states and political subdivisions | Domestic | Commercial Real Estate: other construction and land development | 90 Days or Greater      
Financing receivable recorded investment      
Loans 188,000 16,587,000  
Real estate - mortgage      
Financing receivable recorded investment      
Loans 867,831,000 999,144,000  
Real estate - mortgage | Domestic | Residential: first lien      
Financing receivable recorded investment      
Past due 90 days or Greater and Still Accruing 4,937,000 5,890,000  
Loans 403,658,000 405,119,000  
Real estate - mortgage | Domestic | Residential: first lien | Current      
Financing receivable recorded investment      
Loans 394,975,000 395,629,000  
Real estate - mortgage | Domestic | Residential: first lien | Total Past Due      
Financing receivable recorded investment      
Loans 8,683,000 9,490,000  
Real estate - mortgage | Domestic | Residential: first lien | 30 to 59 Days      
Financing receivable recorded investment      
Loans 2,342,000 2,399,000  
Real estate - mortgage | Domestic | Residential: first lien | 60 to 89 Days      
Financing receivable recorded investment      
Loans 1,212,000 926,000  
Real estate - mortgage | Domestic | Residential: first lien | 90 Days or Greater      
Financing receivable recorded investment      
Loans 5,129,000 6,165,000  
Real estate - mortgage | Domestic | Residential Junior Lien      
Financing receivable recorded investment      
Past due 90 days or Greater and Still Accruing 1,055,000 1,197,000  
Loans 464,173,000 594,025,000  
Real estate - mortgage | Domestic | Residential Junior Lien | Current      
Financing receivable recorded investment      
Loans 462,256,000 592,020,000  
Real estate - mortgage | Domestic | Residential Junior Lien | Total Past Due      
Financing receivable recorded investment      
Loans 1,917,000 2,005,000  
Real estate - mortgage | Domestic | Residential Junior Lien | 30 to 59 Days      
Financing receivable recorded investment      
Loans 747,000 561,000  
Real estate - mortgage | Domestic | Residential Junior Lien | 60 to 89 Days      
Financing receivable recorded investment      
Loans 115,000 247,000  
Real estate - mortgage | Domestic | Residential Junior Lien | 90 Days or Greater      
Financing receivable recorded investment      
Loans 1,055,000 1,197,000  
Consumer      
Financing receivable recorded investment      
Loans 40,966,000 40,595,000  
Consumer | Domestic      
Financing receivable recorded investment      
Past due 90 days or Greater and Still Accruing 4,000 79,000  
Loans 40,966,000 40,595,000  
Consumer | Domestic | Current      
Financing receivable recorded investment      
Loans 40,643,000 40,127,000  
Consumer | Domestic | Total Past Due      
Financing receivable recorded investment      
Loans 323,000 468,000  
Consumer | Domestic | 30 to 59 Days      
Financing receivable recorded investment      
Loans 231,000 318,000  
Consumer | Domestic | 60 to 89 Days      
Financing receivable recorded investment      
Loans 88,000 71,000  
Consumer | Domestic | 90 Days or Greater      
Financing receivable recorded investment      
Loans 4,000 79,000  
Foreign.      
Financing receivable recorded investment      
Loans 134,797,000 138,970,000  
Foreign. | Foreign      
Financing receivable recorded investment      
Past due 90 days or Greater and Still Accruing 1,574,000 568,000  
Loans 134,797,000 138,970,000  
Foreign. | Foreign | Current      
Financing receivable recorded investment      
Loans 131,672,000 137,744,000  
Foreign. | Foreign | Total Past Due      
Financing receivable recorded investment      
Loans 3,125,000 1,226,000  
Foreign. | Foreign | 30 to 59 Days      
Financing receivable recorded investment      
Loans 1,319,000 478,000  
Foreign. | Foreign | 60 to 89 Days      
Financing receivable recorded investment      
Loans 232,000 180,000  
Foreign. | Foreign | 90 Days or Greater      
Financing receivable recorded investment      
Loans $ 1,574,000 $ 568,000