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Allowance for Credit Losses (By Loan Class) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Balance at the beginning of the period $ 125,972 $ 110,374
Losses charged to allowance (2,033) (2,329)
Recoveries credited to allowance 1,031 701
Net (losses) recoveries charged to allowance (1,002) (1,628)
Credit loss expense 8,587 1,481
Balance at the end of the period 133,557 110,227
Commercial, financial and agricultural | Domestic | Commercial.    
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Balance at the beginning of the period 26,728 23,178
Losses charged to allowance (1,971) (2,112)
Recoveries credited to allowance 625 602
Net (losses) recoveries charged to allowance (1,346) (1,510)
Credit loss expense 2,406 2,233
Balance at the end of the period 27,788 23,901
Commercial, financial and agricultural | Domestic | Commercial real estate: farmland & commercial    
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Balance at the beginning of the period 36,474 35,654
Recoveries credited to allowance 5 8
Net (losses) recoveries charged to allowance 5 8
Credit loss expense 77 (808)
Balance at the end of the period 36,556 34,854
Commercial, financial and agricultural | Domestic | Commercial real estate: multifamily    
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Balance at the beginning of the period 3,794 3,291
Credit loss expense 190 (229)
Balance at the end of the period 3,984 3,062
Obligations of states and political subdivisions | Domestic | Commercial Real Estate: other construction and land development    
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Balance at the beginning of the period 44,684 35,390
Losses charged to allowance   (2)
Recoveries credited to allowance 311 2
Net (losses) recoveries charged to allowance 311  
Credit loss expense 5,938 982
Balance at the end of the period 50,933 36,372
Real estate - mortgage | Domestic | Residential: first lien    
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Balance at the beginning of the period 4,759 4,073
Losses charged to allowance   (99)
Recoveries credited to allowance 7 30
Net (losses) recoveries charged to allowance 7 (69)
Credit loss expense (207) 12
Balance at the end of the period 4,559 4,016
Real estate - mortgage | Domestic | Residential Junior Lien    
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Balance at the beginning of the period 8,284 7,754
Losses charged to allowance (1) (28)
Recoveries credited to allowance 77 48
Net (losses) recoveries charged to allowance 76 20
Credit loss expense (3) (728)
Balance at the end of the period 8,357 7,046
Consumer | Domestic    
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Balance at the beginning of the period 281 272
Losses charged to allowance (61) (88)
Recoveries credited to allowance 6 11
Net (losses) recoveries charged to allowance (55) (77)
Credit loss expense 65 69
Balance at the end of the period 291 264
Foreign. | Foreign    
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Balance at the beginning of the period 968 762
Credit loss expense 121 (50)
Balance at the end of the period $ 1,089 $ 712