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Allowance for Credit Losses (By Loan Class) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]        
Balance at the beginning of the period $ 140,503 $ 112,572 $ 125,972 $ 110,374
Losses charged to allowance (2,569) (2,626) (7,584) (7,047)
Recoveries credited to allowance 596 724 2,739 2,127
Net (losses) recoveries charged to allowance (1,973) (1,902) (4,845) (4,920)
Credit loss expense 10,476 8,525 27,879 13,741
Balance at the end of the period 149,006 119,195 149,006 119,195
Commercial, financial and agricultural | Domestic | Commercial.        
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]        
Balance at the beginning of the period 27,645 25,577 26,728 23,178
Losses charged to allowance (2,373) (2,568) (7,136) (6,681)
Recoveries credited to allowance 518 562 1,699 1,672
Net (losses) recoveries charged to allowance (1,855) (2,006) (5,437) (5,009)
Credit loss expense 8,063 1,273 12,562 6,675
Balance at the end of the period 33,853 24,844 33,853 24,844
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 38,688 35,270 36,474 35,654
Recoveries credited to allowance 6 7 17 21
Net (losses) recoveries charged to allowance 6 7 17 21
Credit loss expense 3,190 (303) 5,393 (701)
Balance at the end of the period 41,884 34,974 41,884 34,974
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 4,106 2,856 3,794 3,291
Credit loss expense 422 237 734 (198)
Balance at the end of the period 4,528 3,093 4,528 3,093
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 53,064 36,713 44,684 35,390
Losses charged to allowance       (2)
Recoveries credited to allowance   100 837 103
Net (losses) recoveries charged to allowance   100 837 101
Credit loss expense (1,967) 5,255 5,576 6,577
Balance at the end of the period 51,097 42,068 51,097 42,068
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 5,092 4,137 4,759 4,073
Losses charged to allowance (43) (3) (43) (159)
Recoveries credited to allowance 7 13 15 211
Net (losses) recoveries charged to allowance (36) 10 (28) 52
Credit loss expense 481 540 806 562
Balance at the end of the period 5,537 4,687 5,537 4,687
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 10,442 6,894 8,284 7,754
Losses charged to allowance (118)   (283) (28)
Recoveries credited to allowance 63 27 155 89
Net (losses) recoveries charged to allowance (55) 27 (128) 61
Credit loss expense 206 1,351 2,437 457
Balance at the end of the period 10,593 8,272 10,593 8,272
Consumer | Domestic        
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]        
Balance at the beginning of the period 286 270 281 272
Losses charged to allowance (35) (55) (122) (177)
Recoveries credited to allowance 2 15 16 31
Net (losses) recoveries charged to allowance (33) (40) (106) (146)
Credit loss expense 45 62 123 166
Balance at the end of the period 298 292 298 292
Foreign. | Foreign        
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]        
Balance at the beginning of the period 1,180 855 968 762
Credit loss expense 36 110 248 203
Balance at the end of the period $ 1,216 $ 965 $ 1,216 $ 965