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Allowance for Credit Losses (By Loan Class) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Allowance for Credit Losses          
Balance at the beginning of the period   $ 61,384 $ 109,059 $ 60,278 $ 61,384
Losses charged to allowance     (9,024) (9,574) (22,928)
Recoveries credited to allowance     2,384 2,629 2,979
Net (losses) recoveries charged to allowance     (6,640) (6,945) (19,949)
Credit loss expense     7,955 45,379 18,843
Balance at the end of the period     110,374 109,059 60,278
Nonperforming Financing Receivable [Member]          
Allowance for Credit Losses          
Credit loss expense $ (9,500) (9,500)      
ASU 2016-13 | Adjustment          
Allowance for Credit Losses          
Balance at the beginning of the period       10,347  
Balance at the end of the period         10,347
Commercial, financial and agricultural | Domestic | Commercial.          
Allowance for Credit Losses          
Balance at the beginning of the period   12,596 21,908 11,145 12,596
Losses charged to allowance     (8,083) (8,936) (14,412)
Recoveries credited to allowance     1,943 2,191 2,196
Net (losses) recoveries charged to allowance     (6,140) (6,745) (12,216)
Credit loss expense     7,410 13,261 10,765
Balance at the end of the period     23,178 21,908 11,145
Commercial, financial and agricultural | Domestic | Commercial. | ASU 2016-13 | Adjustment          
Allowance for Credit Losses          
Balance at the beginning of the period       4,247  
Balance at the end of the period         4,247
Commercial, financial and agricultural | Domestic | Commercial real estate: farmland & commercial          
Allowance for Credit Losses          
Balance at the beginning of the period   19,353 30,000 16,533 19,353
Losses charged to allowance     (364)   (7,353)
Recoveries credited to allowance     171   318
Net (losses) recoveries charged to allowance     (193)   (7,035)
Credit loss expense     5,847   4,215
Balance at the end of the period     35,654 30,000 16,533
Commercial, financial and agricultural | Domestic | Commercial real estate: multifamily          
Allowance for Credit Losses          
Balance at the beginning of the period   1,808 5,051 1,786 1,808
Credit loss expense     (1,760) 3,620 (22)
Balance at the end of the period     3,291 5,051 1,786
Commercial, financial and agricultural | Domestic | Commercial real estate: multifamily | ASU 2016-13 | Adjustment          
Allowance for Credit Losses          
Balance at the beginning of the period       (355)  
Balance at the end of the period         (355)
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   15,123 37,612 18,152 15,123
Losses charged to allowance     (2) (19) (39)
Recoveries credited to allowance       35 113
Net (losses) recoveries charged to allowance     (2) 16 74
Credit loss expense     (2,220) 6,053 2,955
Balance at the end of the period     35,390 37,612 18,152
Obligations of states and political subdivisions | Domestic | Commercial Real Estate: other construction and land development | ASU 2016-13 | Adjustment          
Allowance for Credit Losses          
Balance at the beginning of the period       13,391  
Balance at the end of the period         13,391
Obligations of states and political subdivisions | Domestic | Commercial real estate: farmland & commercial          
Allowance for Credit Losses          
Balance at the beginning of the period     30,000 16,533  
Losses charged to allowance       (55)  
Recoveries credited to allowance       117  
Net (losses) recoveries charged to allowance       62  
Credit loss expense       17,697  
Balance at the end of the period       30,000 16,533
Obligations of states and political subdivisions | Domestic | Commercial real estate: farmland & commercial | ASU 2016-13 | Adjustment          
Allowance for Credit Losses          
Balance at the beginning of the period       (4,292)  
Balance at the end of the period         (4,292)
Real estate - mortgage | Domestic | Residential: first lien          
Allowance for Credit Losses          
Balance at the beginning of the period   3,467 3,874 3,762 3,467
Losses charged to allowance     (373) (160) (201)
Recoveries credited to allowance     60 21 26
Net (losses) recoveries charged to allowance     (313) (139) (175)
Credit loss expense     512 1,831 470
Balance at the end of the period     4,073 3,874 3,762
Real estate - mortgage | Domestic | Residential: first lien | ASU 2016-13 | Adjustment          
Allowance for Credit Losses          
Balance at the beginning of the period       (1,580)  
Balance at the end of the period         (1,580)
Real estate - mortgage | Domestic | Residential Junior Lien          
Allowance for Credit Losses          
Balance at the beginning of the period   7,719 9,570 7,535 7,719
Losses charged to allowance     (25) (124) (435)
Recoveries credited to allowance     164 186 286
Net (losses) recoveries charged to allowance     139 62 (149)
Credit loss expense     (1,955) 2,402 (35)
Balance at the end of the period     7,754 9,570 7,535
Real estate - mortgage | Domestic | Residential Junior Lien | ASU 2016-13 | Adjustment          
Allowance for Credit Losses          
Balance at the beginning of the period       (429)  
Balance at the end of the period         (429)
Consumer | Domestic          
Allowance for Credit Losses          
Balance at the beginning of the period   447 291 542 447
Losses charged to allowance     (176) (280) (487)
Recoveries credited to allowance     46 69 40
Net (losses) recoveries charged to allowance     (130) (211) (447)
Credit loss expense     111 185 542
Balance at the end of the period     272 291 542
Consumer | Domestic | ASU 2016-13 | Adjustment          
Allowance for Credit Losses          
Balance at the beginning of the period       (225)  
Balance at the end of the period         (225)
Foreign. | Foreign          
Allowance for Credit Losses          
Balance at the beginning of the period   $ 871 753 823 871
Losses charged to allowance     (1)   (1)
Recoveries credited to allowance       10  
Net (losses) recoveries charged to allowance     (1) 10 (1)
Credit loss expense     10 330 (47)
Balance at the end of the period     $ 762 753 823
Foreign. | Foreign | ASU 2016-13 | Adjustment          
Allowance for Credit Losses          
Balance at the beginning of the period       $ (410)  
Balance at the end of the period         $ (410)