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Allowance for Credit Losses (By Loan Class) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at the beginning of the period $ 110,374 $ 109,059 $ 60,278
Losses charged to allowance (9,479) (9,024) (9,574)
Recoveries credited to allowance 3,426 2,384 2,629
Net (losses) recoveries charged to allowance (6,053) (6,640) (6,945)
Credit loss expense 21,651 7,955 45,379
Balance at the end of the period 125,972 110,374 109,059
ASU 2016-13      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at the beginning of the period     10,347
Commercial, financial and agricultural | Domestic | Commercial.      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at the beginning of the period 23,178 21,908 11,145
Losses charged to allowance (9,050) (8,083) (8,936)
Recoveries credited to allowance 2,894 1,943 2,191
Net (losses) recoveries charged to allowance (6,156) (6,140) (6,745)
Credit loss expense 9,706 7,410 13,261
Balance at the end of the period 26,728 23,178 21,908
Commercial, financial and agricultural | Domestic | Commercial. | ASU 2016-13      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at the beginning of the period     4,247
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 35,654 30,000 16,533
Losses charged to allowance (16) (364) (55)
Recoveries credited to allowance 27 171 117
Net (losses) recoveries charged to allowance 11 (193) 62
Credit loss expense 809 5,847 17,697
Balance at the end of the period 36,474 35,654 30,000
Commercial, financial and agricultural | Domestic | Commercial real estate: farmland & commercial | ASU 2016-13      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at the beginning of the period     (4,292)
Commercial, financial and agricultural | Domestic | Commercial real estate: multifamily      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at the beginning of the period 3,291 5,051 1,786
Credit loss expense 503 (1,760) 3,620
Balance at the end of the period 3,794 3,291 5,051
Commercial, financial and agricultural | Domestic | Commercial real estate: multifamily | ASU 2016-13      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at the beginning of the period     (355)
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 35,390 37,612 18,152
Losses charged to allowance (2) (2) (19)
Recoveries credited to allowance 123   35
Net (losses) recoveries charged to allowance 121 (2) 16
Credit loss expense 9,173 (2,220) 6,053
Balance at the end of the period 44,684 35,390 37,612
Obligations of states and political subdivisions | Domestic | Commercial Real Estate: other construction and land development | ASU 2016-13      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at the beginning of the period     13,391
Real estate - mortgage | Domestic | Residential: first lien      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at the beginning of the period 4,073 3,874 3,762
Losses charged to allowance (160) (373) (160)
Recoveries credited to allowance 240 60 21
Net (losses) recoveries charged to allowance 80 (313) (139)
Credit loss expense 606 512 1,831
Balance at the end of the period 4,759 4,073 3,874
Real estate - mortgage | Domestic | Residential: first lien | ASU 2016-13      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at the beginning of the period     (1,580)
Real estate - mortgage | Domestic | Residential Junior Lien      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at the beginning of the period 7,754 9,570 7,535
Losses charged to allowance (28) (25) (124)
Recoveries credited to allowance 104 164 186
Net (losses) recoveries charged to allowance 76 139 62
Credit loss expense 454 (1,955) 2,402
Balance at the end of the period 8,284 7,754 9,570
Real estate - mortgage | Domestic | Residential Junior Lien | ASU 2016-13      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at the beginning of the period     (429)
Consumer | Domestic      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at the beginning of the period 272 291 542
Losses charged to allowance (223) (176) (280)
Recoveries credited to allowance 38 46 69
Net (losses) recoveries charged to allowance (185) (130) (211)
Credit loss expense 194 111 185
Balance at the end of the period 281 272 291
Consumer | Domestic | ASU 2016-13      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at the beginning of the period     (225)
Foreign. | Foreign      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at the beginning of the period 762 753 823
Losses charged to allowance   (1)  
Recoveries credited to allowance     10
Net (losses) recoveries charged to allowance   (1) 10
Credit loss expense 206 10 330
Balance at the end of the period $ 968 $ 762 753
Foreign. | Foreign | ASU 2016-13      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at the beginning of the period     $ (410)