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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Allowance for Credit Losses          
Balance at the beginning of the period   $ 61,384 $ 60,278 $ 61,384 $ 67,687
Losses charged to allowance     (9,574) (22,928) (15,125)
Recoveries credited to allowance     2,629 2,979 2,710
Net (losses) recoveries charged to allowance     (6,945) (19,949) (12,415)
Provision charged (credited) to operations     45,379 18,843 6,112
Balance at the end of the period     109,059 60,278 61,384
Nonperforming Financing Receivable [Member]          
Allowance for Credit Losses          
Provision charged (credited) to operations $ (9,500) (9,500)      
ASU 2016-13          
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 Loan [Member]          
Allowance for Credit Losses          
Balance at the beginning of the period   12,596 11,145 12,596 27,905
Losses charged to allowance     (8,936) (14,412) (14,220)
Recoveries credited to allowance     2,191 2,196 1,981
Net (losses) recoveries charged to allowance     (6,745) (12,216) (12,239)
Provision charged (credited) to operations     13,261 10,765 (3,070)
Balance at the end of the period     21,908 11,145 12,596
Commercial, financial and agricultural | Domestic | Commercial Loan [Member] | ASU 2016-13          
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 and Commercial Receivable [Member]          
Allowance for Credit Losses          
Balance at the beginning of the period   19,353 16,533 19,353 16,663
Losses charged to allowance     (55)   (70)
Recoveries credited to allowance     117   246
Net (losses) recoveries charged to allowance     62   176
Provision charged (credited) to operations     17,697   2,514
Balance at the end of the period     30,000 16,533 19,353
Commercial, financial and agricultural | Domestic | Commercial Real Estate Farmland and Commercial Receivable [Member] | ASU 2016-13          
Allowance for Credit Losses          
Balance at the beginning of the period     (4,292)    
Balance at the end of the period       (4,292)  
Commercial, financial and agricultural | Domestic | Commercial Real Estate Multifamily Receivable [Member]          
Allowance for Credit Losses          
Balance at the beginning of the period   1,808 1,786 1,808 1,109
Provision charged (credited) to operations     3,620 (22) 699
Balance at the end of the period     5,051 1,786 1,808
Commercial, financial and agricultural | Domestic | Commercial Real Estate Multifamily Receivable [Member] | ASU 2016-13          
Allowance for Credit Losses          
Balance at the beginning of the period     (355)    
Balance at the end of the period       (355)  
Commercial Real Estate Portfolio Segment [Member] | Domestic | Commercial Real Estate: other construction and land development          
Allowance for Credit Losses          
Balance at the beginning of the period   15,123 18,152 15,123 11,675
Losses charged to allowance     (19) (39) (1)
Recoveries credited to allowance     35 113 25
Net (losses) recoveries charged to allowance     16 74 24
Provision charged (credited) to operations     6,053 2,955 3,424
Balance at the end of the period     37,612 18,152 15,123
Commercial Real Estate Portfolio Segment [Member] | Domestic | Commercial Real Estate: other construction and land development | ASU 2016-13          
Allowance for Credit Losses          
Balance at the beginning of the period     13,391    
Balance at the end of the period       13,391  
Commercial Real Estate Portfolio Segment [Member] | Domestic | Commercial Real Estate Farmland and Commercial Receivable [Member]          
Allowance for Credit Losses          
Balance at the beginning of the period   19,353 16,533 19,353  
Losses charged to allowance       (7,353)  
Recoveries credited to allowance       318  
Net (losses) recoveries charged to allowance       (7,035)  
Provision charged (credited) to operations       4,215  
Balance at the end of the period       16,533 19,353
Real estate - mortgage | Domestic | Residential First Mortgage Financing Receivable [Member]          
Allowance for Credit Losses          
Balance at the beginning of the period   3,467 3,762 3,467 2,950
Losses charged to allowance     (160) (201) (122)
Recoveries credited to allowance     21 26 36
Net (losses) recoveries charged to allowance     (139) (175) (86)
Provision charged (credited) to operations     1,831 470 603
Balance at the end of the period     3,874 3,762 3,467
Real estate - mortgage | Domestic | Residential First Mortgage Financing Receivable [Member] | ASU 2016-13          
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 7,535 7,719 6,103
Losses charged to allowance     (124) (435) (347)
Recoveries credited to allowance     186 286 369
Net (losses) recoveries charged to allowance     62 (149) 22
Provision charged (credited) to operations     2,402 (35) 1,594
Balance at the end of the period     9,570 7,535 7,719
Real estate - mortgage | Domestic | Residential Junior Lien | ASU 2016-13          
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   447 542 447 440
Losses charged to allowance     (280) (487) (362)
Recoveries credited to allowance     69 40 43
Net (losses) recoveries charged to allowance     (211) (447) (319)
Provision charged (credited) to operations     185 542 326
Balance at the end of the period     291 542 447
Consumer | Domestic | ASU 2016-13          
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   $ 871 823 871 842
Losses charged to allowance       (1) (3)
Recoveries credited to allowance     10   10
Net (losses) recoveries charged to allowance     10 (1) 7
Provision charged (credited) to operations     330 (47) 22
Balance at the end of the period     753 823 $ 871
Foreign | Foreign | ASU 2016-13          
Allowance for Credit Losses          
Balance at the beginning of the period     $ (410)    
Balance at the end of the period       $ (410)