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Allowance for Credit Losses (By Loan Class) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]      
Balance at the beginning of the period $ 125,972 $ 110,374 $ 109,059
Losses charged to allowance (10,184) (9,479) (9,024)
Recoveries credited to allowance 6,705 3,426 2,384
Net losses charged to allowance (3,479) (6,053) (6,640)
Provision (credit) charged to operations 34,576 21,651 7,955
Balance at the end of the period 157,069 125,972 110,374
Commercial, financial and agricultural | Domestic | Commercial.      
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]      
Balance at the beginning of the period 26,728 23,178 21,908
Losses charged to allowance (9,664) (9,050) (8,083)
Recoveries credited to allowance 5,433 2,894 1,943
Net losses charged to allowance (4,231) (6,156) (6,140)
Provision (credit) charged to operations 13,053 9,706 7,410
Balance at the end of the period 35,550 26,728 23,178
Commercial, financial and agricultural | Domestic | Commercial real estate: farmland & commercial      
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]      
Balance at the beginning of the period 36,474 35,654 30,000
Losses charged to allowance   (16) (364)
Recoveries credited to allowance 143 27 171
Net losses charged to allowance 143 11 (193)
Provision (credit) charged to operations 6,086 809 5,847
Balance at the end of the period 42,703 36,474 35,654
Commercial, financial and agricultural | Domestic | Commercial real estate: multifamily      
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]      
Balance at the beginning of the period 3,794 3,291 5,051
Provision (credit) charged to operations 1,294 503 (1,760)
Balance at the end of the period 5,088 3,794 3,291
Obligations of states and political subdivisions | Domestic | Commercial Real Estate: other construction and land development      
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]      
Balance at the beginning of the period 44,684 35,390 37,612
Losses charged to allowance   (2) (2)
Recoveries credited to allowance 837 123  
Net losses charged to allowance 837 121 (2)
Provision (credit) charged to operations 9,770 9,173 (2,220)
Balance at the end of the period 55,291 44,684 35,390
Real estate - mortgage | Domestic | Residential: first lien      
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]      
Balance at the beginning of the period 4,759 4,073 3,874
Losses charged to allowance (43) (160) (373)
Recoveries credited to allowance 16 240 60
Net losses charged to allowance (27) 80 (313)
Provision (credit) charged to operations 1,080 606 512
Balance at the end of the period 5,812 4,759 4,073
Real estate - mortgage | Domestic | Residential Junior Lien      
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]      
Balance at the beginning of the period 8,284 7,754 9,570
Losses charged to allowance (298) (28) (25)
Recoveries credited to allowance 260 104 164
Net losses charged to allowance (38) 76 139
Provision (credit) charged to operations 2,778 454 (1,955)
Balance at the end of the period 11,024 8,284 7,754
Consumer | Domestic      
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]      
Balance at the beginning of the period 281 272 291
Losses charged to allowance (179) (223) (176)
Recoveries credited to allowance 16 38 46
Net losses charged to allowance (163) (185) (130)
Provision (credit) charged to operations 200 194 111
Balance at the end of the period 318 281 272
Foreign. | Foreign      
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]      
Balance at the beginning of the period 968 762 753
Losses charged to allowance     (1)
Net losses charged to allowance     (1)
Provision (credit) charged to operations 315 206 10
Balance at the end of the period $ 1,283 $ 968 $ 762