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Allowance for Credit Losses (By Loan Class) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Allowance for Credit Losses    
Balance at the beginning of the period $ 110,374 $ 109,059
Losses charged to allowance (2,329) (2,353)
Recoveries credited to allowance 701 510
Net (losses) recoveries charged to allowance (1,628) (1,843)
Credit loss expense 1,481 1,192
Balance at the end of the period 110,227 108,408
Commercial, financial and agricultural | Domestic | Commercial.    
Allowance for Credit Losses    
Balance at the beginning of the period 23,178 21,908
Losses charged to allowance (2,112) (1,893)
Recoveries credited to allowance 602 458
Net (losses) recoveries charged to allowance (1,510) (1,435)
Credit loss expense 2,233 1,690
Balance at the end of the period 23,901 22,163
Commercial, financial and agricultural | Domestic | Commercial real estate: farmland & commercial    
Allowance for Credit Losses    
Balance at the beginning of the period 35,654 30,000
Losses charged to allowance   (356)
Recoveries credited to allowance 8 12
Net (losses) recoveries charged to allowance 8 (344)
Credit loss expense (808) 2,547
Balance at the end of the period 34,854 32,203
Commercial, financial and agricultural | Domestic | Commercial real estate: multifamily    
Allowance for Credit Losses    
Balance at the beginning of the period 3,291 5,051
Credit loss expense (229) 884
Balance at the end of the period 3,062 5,935
Obligations of states and political subdivisions | Domestic | Commercial Real Estate: other construction and land development    
Allowance for Credit Losses    
Balance at the beginning of the period 35,390 37,612
Losses charged to allowance (2)  
Recoveries credited to allowance 2  
Credit loss expense 982 (3,206)
Balance at the end of the period 36,372 34,406
Real estate - mortgage | Domestic | Residential: first lien    
Allowance for Credit Losses    
Balance at the beginning of the period 4,073 3,874
Losses charged to allowance (99) (72)
Recoveries credited to allowance 30 11
Net (losses) recoveries charged to allowance (69) (61)
Credit loss expense 12 104
Balance at the end of the period 4,016 3,917
Real estate - mortgage | Domestic | Residential Junior Lien    
Allowance for Credit Losses    
Balance at the beginning of the period 7,754 9,570
Losses charged to allowance (28)  
Recoveries credited to allowance 48 21
Net (losses) recoveries charged to allowance 20 21
Credit loss expense (728) (855)
Balance at the end of the period 7,046 8,736
Consumer | Domestic    
Allowance for Credit Losses    
Balance at the beginning of the period 272 291
Losses charged to allowance (88) (32)
Recoveries credited to allowance 11 8
Net (losses) recoveries charged to allowance (77) (24)
Credit loss expense 69 12
Balance at the end of the period 264 279
Foreign. | Foreign    
Allowance for Credit Losses    
Balance at the beginning of the period 762 753
Credit loss expense (50) 16
Balance at the end of the period $ 712 $ 769